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Papers by Yulnafatmawita Yulnafatmawita
IOP Conference Series: Earth and Environmental Science, 2022
Carbon dioxide gas which is one of the greenhouse gases stated at Kyoto Protokol in 1997 can come... more Carbon dioxide gas which is one of the greenhouse gases stated at Kyoto Protokol in 1997 can come from peatland. Conversion of peatland into farming land can accelerate the decomposition process of OM which will emit carbon dioxide gas (CO2) into the atmosphere. This study was aimed to measure CO2 emission from several types of peatland in Kinali District, West Pasaman Regency, West Sumatra Province. The research was conducted using a survey method based on the land use type (purposive sampling). The measurement of CO2 was conducted in the field using an infrared non-dispersive sensor (NDIR) found in the Carbon Dioxide (CO2) Monitor tool. Soil properties analyzed were organic-C, total N, and C/N ratio. The results showed that the different use in peatland has no significant effect on the value of CO2 emission. Carbon dioxide emission has a positive correlation (r = 0.68) with soil organic carbon content. The highest average of CO2 emission was 0.92 g/m2/d (under oil palm plantation)...
Jurnal Solum, 2012
There is no much public concern about soil aggregate stability improvement of a soil. This is due... more There is no much public concern about soil aggregate stability improvement of a soil. This is due to the fact that it does not directly affect crop yield for a short term, but it determines sustainable agriculture and development for a long term. This research was aimed to investigate soil physical properties especially soil aggregate stability of Ultisols after fresh OM application, then to determine the exact OM dosage to improve the stability. Ultisols used was from Limau Manis (± 367 m asl), an area in lower footslope of Mount Gadut, having wet tropical rainforest. Due to land use change, farming activities in that sloping area could enhance erosion process in the environment. Therefore, efforts to anticipate the erosion must be found. Fresh OM applied was Gliricidia sepium which was found plenty in the area. Five levels of fresh Gliricidia sepium, were 0, 5, 10, 15, and 20 t/ha. Top soil (0-20 cm depth) was mixed with OM, then incubated for 3 months in glasshouse. The results after a 3-month incubation showed that SOM content did not statistically increase, but it improved based on the criteria, from very low to low level as OM was applied for ≥ 10 t/ha. It seemed that 10 t/ha Gliricidia sepium was the best dosage at this condition. There was a positive correlation between SOM content and aggregate stability index of Ultisols after fresh Gliricidia sepium addition.
International Journal on Advanced Science, Engineering and Information Technology, 2015
Corporate Social Responsibility (CSR) of a company is aimed to improve social welfare around the ... more Corporate Social Responsibility (CSR) of a company is aimed to improve social welfare around the company, then to get good relationship among people in the society as well as between society and the company itself for the sustainability. A research about implementation of Corporate Social Responsibility (CSR) program of PT. Semen Padang, a cement factory, was aimed to identify programs and collaborative model conducted by PT. Semen Padang in implementing the CSR program. This research was conducted in Batu Gadang Lubuk Kilangan (which is categorized as ring I for CSR receiver) located next to limestone hill, a source of raw material for cement Padang. Data were collected by interviewing CSR Bureau of PT Semen Padang, local government ("Kelurahan") staffs, local organization ("KAN") staffs, people in Batu Gadang receiving and non-receiving CSR using survey method. Data were analyzed using Descriptive Analyses method. Based on the data collected, it could be concluded that PT Semen Padang totally had allocated fund for the CSR more than the amount (>2%) it had to set aside. The CSR program was implemented through 3 forms, those were Partnership Program (PP), Environmental Guidance (EG) and National Company-Care (NCC), as well as other program which was not included in PP and EG (non-PPEG). Among the programs implemented, partnership program gave better result. If PT Semen Padang fully engaged local organization such as "KAN" as a co-worker, implementation of the CSR program can be more effective and reliable.
Jurnal Solum, Jul 2, 2005
A research about organic matter role on P desorption in Andisol was conducted in soil laboratory ... more A research about organic matter role on P desorption in Andisol was conducted in soil laboratory of Agricultural Faculty, Andalas University Limau Manis Padang. The objective of this research was to find out the ability of organic matter to change retained-or fixed-P into available-P in Andisols. This research was designed as completely randomized design (CRD) with 5 levels of chicken manure consisting of 2, 4, 6, 8, and 10 ton/ha by 3 replications. Based on laboratory analysis, the soil (Andisols) had pH 5.65, OC 2.33%, N-total 0.26%, available-P 56.94 ppm, and potential-P 60.38 mg/100 g soil. While chicken manure had OC 21.45%, total-N 5.60%, total-P 33.19 mg/100g and C/N ratio 3.83. The results showed that desorpted-P increased by increasing amount of chicken manure applied.
Jurnal Tanah dan Sumberdaya Lahan, 2020
Land-use change from the forest into tea plantation in Solok Regency in 1983 has decreased the ar... more Land-use change from the forest into tea plantation in Solok Regency in 1983 has decreased the area of forests in Gunung Talang District. Clearing up the forest at the beginning for tea plantation could worsen the physical and chemical conditions of the soil. One of which is soil aggregate stability that is very dynamic and can influence other soil physical properties. This study was aimed to determine soil Aggregate Stability Index (ASI) at tea plantations. Soil samples was taken at a depth of 0-20 cm from five different slopes (0-8% (A), 8-15% (B), 15-25% (C), 25-45% (D), and> 45% (E)) and at two crop ages (10 and 35 years old). The results showed that the soil aggregate stability index at tea plantations ranged from stable to very stable. It tended to decrease by increasing slope percentage at each of crop age, Between the ages, it showed higher ASI at 35 years old crop age under relatively flat (0-8%) and very steep (>45%) areas.
IOP Conference Series: Earth and Environmental Science, 2020
Soil organic carbon [OC] sequestration is affected by some factors, one of which is the vegetatio... more Soil organic carbon [OC] sequestration is affected by some factors, one of which is the vegetation living on it. Tea is a crop on which the part being harvested is the leaves, which are supposed to contribute to soil OC. The objective of the research was to determine the amount of OC sequestered at different crop age under tea plantation in wet tropical areas. The soil samples were taken from 3 different crop ages [36, 21, and 9 years old] under the same slope [>45%] and soil [volcanic] at ≥ 1,400 m asl. As a comparison, the soil was also sampled from the secondary forest around the research site. At each crop age and the forest, the soil was sampled for 100 cm depth with a 20 cm increment. Undisturbed soil samples were taken for soil BD and disturbed soil samples for OC. The result showed that SOC content decreased by soil depth, and the soil BD was not significantly different among the depths. Therefore, the amount of OC sequestered declined by decreasing soil depth. The SOC se...
Jurnal Warta Pengabdian Andalas
Maninjau Village, including the tourist destination of Buya Hamka in Sungai Batang, is susceptibl... more Maninjau Village, including the tourist destination of Buya Hamka in Sungai Batang, is susceptible to natural disasters, such as landslides. It happens due to the sloping and high rainfall (> 3000 mm per year) area. The soil is prone to landslides if the sloping land is intensively cultivated for crop growth. This community engagement activity socialised and practised alley cropping techniques to manage farming in the sloping area. This method for introducing the alley cropping technique was through presentation and discussion as well as practice in the field with a farming group “Sehati”, a member of KPGH (Hamka generation youth community), and community leaders of the Nagari Sungai Batang in November 2021. A farmer cultivating red onion adopted the alley cropping method for the farm having a 19o39’ (36%) slope level with an alley width was 5 m. Gliricidia sepium and Tithonia diversifolia, known as green manure crops, were placed perpendicular to the slope of the alley fence. Gl...
World Academy of Science, Engineering and Technology, International Journal of Agricultural and Biosystems Engineering, Jan 26, 2015
World Academy of Science, Engineering and Technology, International Journal of Geological and Environmental Engineering, 2017
IOP Conference Series: Earth and Environmental Science, 2020
Volcanic ash material (Vam) can cover the surface of the farming land post volcano eruption. The ... more Volcanic ash material (Vam) can cover the surface of the farming land post volcano eruption. The covering process could be advantageous for soil fertility if it is thin enough, but it can be destructive for the crops if it is thick. The purpose of this research was to study the effect of the application of Geo-organo granules from volcanic ash and Tithonia (Tt) for the production of Baby Corn in Oxisol. The pot experiments design with six treatments (1AV:1Tt; 1AV:2Tt; 1AV:3Tt; 1AV:4Tt; 1AV:0Tt; 0AV:1Tt)) three replications, and used Completely Randomized Design (CRD). The criteria test of compost standard used to test the benefit of these Geo-organo materials (PT Pusri, SNI, and Regulation from Agriculture Ministry, Republic of Indonesia). Corn growth was also measured for height and yield. Plant height and yield were analyzed using F-test and continued using HSD at a 5% level of significance. The results showed that Geo-organo granules be to improve soil chemical properties of Oxis...
IOP Conference Series: Earth and Environmental Science, 2020
The primary constraint of suboptimal soils under wet tropical regions, besides their low pH, is t... more The primary constraint of suboptimal soils under wet tropical regions, besides their low pH, is their low soil organic matter (SOM) content. This research was aimed to determine SOM stock of suboptimal soil orders (Ultisol, Oxisol, and Inceptisol) under corn (Zea mays) cultivation. This research was conducted using survey method, and soil samples were taken from 0-20 cm soil depth from each soil order under two types of land use (LU), corn cultivation and forest, in Lima Puluh Kota Regency, West Sumatra, Indonesia. The soil samples were analyzed at the soil laboratory at Andalas University, Padang. Parameters analyzed were soil bulk density (BD), texture, SOC, total-N. Data resulted showed that the soil texture from the three soil orders was classified as clay loam to clay, with the sand size particle was Inceptisol >Oxisol>Ultisol. Then, soil BD was categorized as medium. The highest SOM stock was at Oxisol under forest LU, then Ultisol and Inceptisol. Generally, SOM stock un...
Chemical leaching from soil surface will cause groundwater pollution. Researches showed spatial c... more Chemical leaching from soil surface will cause groundwater pollution. Researches showed spatial correlation of the leaching chemicals. Based on the fact, a filed research was conducted at Maury silt loam soil (fine, mesic, mixed, Typic Paleudalf) to evaluate spatial variations of anion movement, in tis case was Cl, into and below rooting zone. Source of chloride, SrCl2.6H2O, was evenly distributed on soil surface within a 18 x 18 m2 plot in University of Kentucky Experimental Station, Lexington, Kentucky USA. Soil was sampled for 4 times (after receiving 166, 310, 586, 1085 mm rainfall), in every 10 cm depth for 54 points within the plot. The result showed that Cl- movement did not show spatial model from soil surface into 100 cm profile in every sampling date. Therefore, based on analysis of variance, Cl- concentration was significantly different from one depth to another within one sampling time. Cl- concentration found on the depth of 100 cm was 75, 58, 27, and 15% for sampling t...
JOURNAL OF TROPICAL SOILS
Land-use change from the forest to others will affect the soil’s physicochemical properties. The ... more Land-use change from the forest to others will affect the soil’s physicochemical properties. The research was conducted to identify soil physicochemical properties affected by land-use change in Sungai Batang, the east-south part of Maninjau caldera. The research used a survey method from which soil was sampled at four different types of land use (forest, bushland, mixed garden, and paddy soil) at 0-30 cm depth with three replicates. The results show that the soil in Sungai Batang was still developing. It was indicated by coarse soil texture (clay loam to sandy clay loam). Land-use change from the forest to other uses has altered some soil physicochemical properties. It increased soil bulk density and decreased total soil porosity, permeability rate, SOM content, and total-N. However, there was an increase in soil characteristics, especially soil P-availability, CEC, Ca- and Na-exchangeable . While the soil pH (H2O), K-and Mg-exchangeable stayed the same. In general, land use ch...
A research about the role of tithonia and fist waste as liquid organic fertilizer to improve soil... more A research about the role of tithonia and fist waste as liquid organic fertilizer to improve soil chemical characteristics and increase N absorption of melon (Cucumis melo) in Ultisols was conducted at Green House of Agriculture Faculty, Andalas University. The objective of the research were to study appropriate dose of application of synthetic N fertilizer, tithonia and fish waste to improve soil chemical characteristics, also to identify tithonia and fish waste to the effect of application of synthetic N fertilizer, tithonia and fish waste to increase N absorption by melon compared to application of 100% Urea. The treatment were: A= 100% Urea, B = 50% Urea + 50% tithonia, C = 50% Urea + 50 % fish waste, D = 25% Urea + 75% tithonia, E = 25% Urea + 75% fish waste, F = 50% Urea + 25% fish waste + 25 % tithonia. Amount of N applied at each treatment was equal to 233 kg N/ha. The result showed that the optimal dose was 25% Urea + 75 % tithonia, because it improved chemical characterist...
Irrigation source is one of factors affecting physical properties of paddy soil. This research wa... more Irrigation source is one of factors affecting physical properties of paddy soil. This research was aimed to determine the impact of polluted irrigation on soil physical properties of rice field. The study site was located in Koto Nan IV (00o 54' 21.9" S and 100o 23’52.2" E), Dharmasraya Regency, West Sumatra, Indonesia. The rice field over there was irrigated with water from Momongan river in which people did gold mining illegally. For comparison, rice field receiving irrigation from non-polluted source nearby was also anaysed for the physical properties. The result showed that there was a change in physical properties of paddy soil after 7 years of getting irrigation from the river. Based on laboratory analyses, the total suspended solid (TSS) in the tailing reached 10,736 mg/L. The texture of paddy soil was dominated by sand (>50% at the top 100 cm soil depth), and it tended to linearly decrease (R2=0.65) by depth. Likewise, the sand particles also linearly decrea...
Jurnal Solum, 2008
A research entitled the effect of various sources of organic matter on improvement of N,P,K Nutri... more A research entitled the effect of various sources of organic matter on improvement of N,P,K Nutrient of Ultisol was conducted in Limau Manis Padang. The research was aimed to investigate the contribution of different source of organic matter to improve N,P,K content in soil. Field research was arranged in Randomized Block Design (RBD) consisting 5 treatments and 3 replications (blocks). Treatments are : A = no organic matter added, B = Tithonia, C = Paddy Straw, D = Imperata cylindrica, and E = Leucaena glauca. The dosage for each treatment was 20 ton/ha. The result showed that tithonia gave the best contribution in improving N,P,K content of Ultisol Limau Manis.Keywords :organic matter, N, P, K of Ultisols.
Jurnal Solum, 2011
Study about soil organic matter (SOM) leaching in soil profiles of tropical rain forest was condu... more Study about soil organic matter (SOM) leaching in soil profiles of tropical rain forest was conducted in Bukit Pinang-Pinang, the upper footslope of Mt. Gadut in West Sumatra, and in Soil Physical laboratory Andalas University Padang. Bukit Pinang-Pinang is located on 480-640 m asl and geographically is between 100°29’40” and 100°30’20 E” as well as between 0°54’55” and 0°55’45”S. This rain forest area is known as a super wet area because it receives high annual rainfall (>3500 mm). The objective of this research was to measure the amount of SOM leached from top soil into the deeper soil. Undisturbed soil samples were taken from three different land uses, forest, bush, and mixed garden, on the top, middle, and foot slopes. Undisturbed soil samples were leached with distilled water as the amount of rainfall accepted in natural condition. The results showed that, land use change from forest into ecosystems of mixed garden (for over 50 years with 100% soil surface coverage and...
Jurnal Solum, 2008
This research discusses the land suitability of mangosteen field in Kab.50 Kota Kota Payakumbuh, ... more This research discusses the land suitability of mangosteen field in Kab.50 Kota Kota Payakumbuh, predict production potential of mangosteen based on the climate suitability, soil and management its field. Composite soil sample is taken through drilling 0 – 60 cm which is carried out on research site. Quantitative model from FAO (1976) is used to evaluate the land suitability. This model combines enviromental data, climate and soil condition (soil physic and chemistry characteristic), so that production potential of field based on climate (Climate Production Potential = CPP) can be maesured quantitatively. By entering the real data of plant production, this model can predict the real plant production in a field (Land Production Potential = LPP). Result of this research shows that climate and physical condition of land are very suitability to grow mangosteen, and its level appropriateness is S1 (very suitability). Then, production potential 3 – 12 ton/ha/year can be increased to...
Jurnal Solum, 2009
Excessive utilization of natural resource by human being will affect the sustainability of agricu... more Excessive utilization of natural resource by human being will affect the sustainability of agriculture, land and environment. This is due to degradation of soil physical properties in the area. A research about study of soil physical properties had been taken out in a sub-sub watershed Batanang of Sumpur watershed, Batipuh, Tanah Datar Regency, in West Sumatra. The research was conducted by surveying the area in 2006. Disturbed and undisturbed soil samples were taken in different land units. Then, soil samples were analysed at soil laboratory, Agriculture College, Andalas University Padang. The result showed that all of land units in this sub sub watersehed had the same soil texture class, that was fine clay. The bulk volume of the soil was higher in Mixed woodland unit than those in forest land units. Permeability value of the soil was higher at forest from all degrees of slope than that at mixed woodland, even though soil organic matter content of mixed woodland unit highe...
IOP Conference Series: Earth and Environmental Science, 2022
Carbon dioxide gas which is one of the greenhouse gases stated at Kyoto Protokol in 1997 can come... more Carbon dioxide gas which is one of the greenhouse gases stated at Kyoto Protokol in 1997 can come from peatland. Conversion of peatland into farming land can accelerate the decomposition process of OM which will emit carbon dioxide gas (CO2) into the atmosphere. This study was aimed to measure CO2 emission from several types of peatland in Kinali District, West Pasaman Regency, West Sumatra Province. The research was conducted using a survey method based on the land use type (purposive sampling). The measurement of CO2 was conducted in the field using an infrared non-dispersive sensor (NDIR) found in the Carbon Dioxide (CO2) Monitor tool. Soil properties analyzed were organic-C, total N, and C/N ratio. The results showed that the different use in peatland has no significant effect on the value of CO2 emission. Carbon dioxide emission has a positive correlation (r = 0.68) with soil organic carbon content. The highest average of CO2 emission was 0.92 g/m2/d (under oil palm plantation)...
Jurnal Solum, 2012
There is no much public concern about soil aggregate stability improvement of a soil. This is due... more There is no much public concern about soil aggregate stability improvement of a soil. This is due to the fact that it does not directly affect crop yield for a short term, but it determines sustainable agriculture and development for a long term. This research was aimed to investigate soil physical properties especially soil aggregate stability of Ultisols after fresh OM application, then to determine the exact OM dosage to improve the stability. Ultisols used was from Limau Manis (± 367 m asl), an area in lower footslope of Mount Gadut, having wet tropical rainforest. Due to land use change, farming activities in that sloping area could enhance erosion process in the environment. Therefore, efforts to anticipate the erosion must be found. Fresh OM applied was Gliricidia sepium which was found plenty in the area. Five levels of fresh Gliricidia sepium, were 0, 5, 10, 15, and 20 t/ha. Top soil (0-20 cm depth) was mixed with OM, then incubated for 3 months in glasshouse. The results after a 3-month incubation showed that SOM content did not statistically increase, but it improved based on the criteria, from very low to low level as OM was applied for ≥ 10 t/ha. It seemed that 10 t/ha Gliricidia sepium was the best dosage at this condition. There was a positive correlation between SOM content and aggregate stability index of Ultisols after fresh Gliricidia sepium addition.
International Journal on Advanced Science, Engineering and Information Technology, 2015
Corporate Social Responsibility (CSR) of a company is aimed to improve social welfare around the ... more Corporate Social Responsibility (CSR) of a company is aimed to improve social welfare around the company, then to get good relationship among people in the society as well as between society and the company itself for the sustainability. A research about implementation of Corporate Social Responsibility (CSR) program of PT. Semen Padang, a cement factory, was aimed to identify programs and collaborative model conducted by PT. Semen Padang in implementing the CSR program. This research was conducted in Batu Gadang Lubuk Kilangan (which is categorized as ring I for CSR receiver) located next to limestone hill, a source of raw material for cement Padang. Data were collected by interviewing CSR Bureau of PT Semen Padang, local government ("Kelurahan") staffs, local organization ("KAN") staffs, people in Batu Gadang receiving and non-receiving CSR using survey method. Data were analyzed using Descriptive Analyses method. Based on the data collected, it could be concluded that PT Semen Padang totally had allocated fund for the CSR more than the amount (>2%) it had to set aside. The CSR program was implemented through 3 forms, those were Partnership Program (PP), Environmental Guidance (EG) and National Company-Care (NCC), as well as other program which was not included in PP and EG (non-PPEG). Among the programs implemented, partnership program gave better result. If PT Semen Padang fully engaged local organization such as "KAN" as a co-worker, implementation of the CSR program can be more effective and reliable.
Jurnal Solum, Jul 2, 2005
A research about organic matter role on P desorption in Andisol was conducted in soil laboratory ... more A research about organic matter role on P desorption in Andisol was conducted in soil laboratory of Agricultural Faculty, Andalas University Limau Manis Padang. The objective of this research was to find out the ability of organic matter to change retained-or fixed-P into available-P in Andisols. This research was designed as completely randomized design (CRD) with 5 levels of chicken manure consisting of 2, 4, 6, 8, and 10 ton/ha by 3 replications. Based on laboratory analysis, the soil (Andisols) had pH 5.65, OC 2.33%, N-total 0.26%, available-P 56.94 ppm, and potential-P 60.38 mg/100 g soil. While chicken manure had OC 21.45%, total-N 5.60%, total-P 33.19 mg/100g and C/N ratio 3.83. The results showed that desorpted-P increased by increasing amount of chicken manure applied.
Jurnal Tanah dan Sumberdaya Lahan, 2020
Land-use change from the forest into tea plantation in Solok Regency in 1983 has decreased the ar... more Land-use change from the forest into tea plantation in Solok Regency in 1983 has decreased the area of forests in Gunung Talang District. Clearing up the forest at the beginning for tea plantation could worsen the physical and chemical conditions of the soil. One of which is soil aggregate stability that is very dynamic and can influence other soil physical properties. This study was aimed to determine soil Aggregate Stability Index (ASI) at tea plantations. Soil samples was taken at a depth of 0-20 cm from five different slopes (0-8% (A), 8-15% (B), 15-25% (C), 25-45% (D), and> 45% (E)) and at two crop ages (10 and 35 years old). The results showed that the soil aggregate stability index at tea plantations ranged from stable to very stable. It tended to decrease by increasing slope percentage at each of crop age, Between the ages, it showed higher ASI at 35 years old crop age under relatively flat (0-8%) and very steep (>45%) areas.
IOP Conference Series: Earth and Environmental Science, 2020
Soil organic carbon [OC] sequestration is affected by some factors, one of which is the vegetatio... more Soil organic carbon [OC] sequestration is affected by some factors, one of which is the vegetation living on it. Tea is a crop on which the part being harvested is the leaves, which are supposed to contribute to soil OC. The objective of the research was to determine the amount of OC sequestered at different crop age under tea plantation in wet tropical areas. The soil samples were taken from 3 different crop ages [36, 21, and 9 years old] under the same slope [>45%] and soil [volcanic] at ≥ 1,400 m asl. As a comparison, the soil was also sampled from the secondary forest around the research site. At each crop age and the forest, the soil was sampled for 100 cm depth with a 20 cm increment. Undisturbed soil samples were taken for soil BD and disturbed soil samples for OC. The result showed that SOC content decreased by soil depth, and the soil BD was not significantly different among the depths. Therefore, the amount of OC sequestered declined by decreasing soil depth. The SOC se...
Jurnal Warta Pengabdian Andalas
Maninjau Village, including the tourist destination of Buya Hamka in Sungai Batang, is susceptibl... more Maninjau Village, including the tourist destination of Buya Hamka in Sungai Batang, is susceptible to natural disasters, such as landslides. It happens due to the sloping and high rainfall (> 3000 mm per year) area. The soil is prone to landslides if the sloping land is intensively cultivated for crop growth. This community engagement activity socialised and practised alley cropping techniques to manage farming in the sloping area. This method for introducing the alley cropping technique was through presentation and discussion as well as practice in the field with a farming group “Sehati”, a member of KPGH (Hamka generation youth community), and community leaders of the Nagari Sungai Batang in November 2021. A farmer cultivating red onion adopted the alley cropping method for the farm having a 19o39’ (36%) slope level with an alley width was 5 m. Gliricidia sepium and Tithonia diversifolia, known as green manure crops, were placed perpendicular to the slope of the alley fence. Gl...
World Academy of Science, Engineering and Technology, International Journal of Agricultural and Biosystems Engineering, Jan 26, 2015
World Academy of Science, Engineering and Technology, International Journal of Geological and Environmental Engineering, 2017
IOP Conference Series: Earth and Environmental Science, 2020
Volcanic ash material (Vam) can cover the surface of the farming land post volcano eruption. The ... more Volcanic ash material (Vam) can cover the surface of the farming land post volcano eruption. The covering process could be advantageous for soil fertility if it is thin enough, but it can be destructive for the crops if it is thick. The purpose of this research was to study the effect of the application of Geo-organo granules from volcanic ash and Tithonia (Tt) for the production of Baby Corn in Oxisol. The pot experiments design with six treatments (1AV:1Tt; 1AV:2Tt; 1AV:3Tt; 1AV:4Tt; 1AV:0Tt; 0AV:1Tt)) three replications, and used Completely Randomized Design (CRD). The criteria test of compost standard used to test the benefit of these Geo-organo materials (PT Pusri, SNI, and Regulation from Agriculture Ministry, Republic of Indonesia). Corn growth was also measured for height and yield. Plant height and yield were analyzed using F-test and continued using HSD at a 5% level of significance. The results showed that Geo-organo granules be to improve soil chemical properties of Oxis...
IOP Conference Series: Earth and Environmental Science, 2020
The primary constraint of suboptimal soils under wet tropical regions, besides their low pH, is t... more The primary constraint of suboptimal soils under wet tropical regions, besides their low pH, is their low soil organic matter (SOM) content. This research was aimed to determine SOM stock of suboptimal soil orders (Ultisol, Oxisol, and Inceptisol) under corn (Zea mays) cultivation. This research was conducted using survey method, and soil samples were taken from 0-20 cm soil depth from each soil order under two types of land use (LU), corn cultivation and forest, in Lima Puluh Kota Regency, West Sumatra, Indonesia. The soil samples were analyzed at the soil laboratory at Andalas University, Padang. Parameters analyzed were soil bulk density (BD), texture, SOC, total-N. Data resulted showed that the soil texture from the three soil orders was classified as clay loam to clay, with the sand size particle was Inceptisol >Oxisol>Ultisol. Then, soil BD was categorized as medium. The highest SOM stock was at Oxisol under forest LU, then Ultisol and Inceptisol. Generally, SOM stock un...
Chemical leaching from soil surface will cause groundwater pollution. Researches showed spatial c... more Chemical leaching from soil surface will cause groundwater pollution. Researches showed spatial correlation of the leaching chemicals. Based on the fact, a filed research was conducted at Maury silt loam soil (fine, mesic, mixed, Typic Paleudalf) to evaluate spatial variations of anion movement, in tis case was Cl, into and below rooting zone. Source of chloride, SrCl2.6H2O, was evenly distributed on soil surface within a 18 x 18 m2 plot in University of Kentucky Experimental Station, Lexington, Kentucky USA. Soil was sampled for 4 times (after receiving 166, 310, 586, 1085 mm rainfall), in every 10 cm depth for 54 points within the plot. The result showed that Cl- movement did not show spatial model from soil surface into 100 cm profile in every sampling date. Therefore, based on analysis of variance, Cl- concentration was significantly different from one depth to another within one sampling time. Cl- concentration found on the depth of 100 cm was 75, 58, 27, and 15% for sampling t...
JOURNAL OF TROPICAL SOILS
Land-use change from the forest to others will affect the soil’s physicochemical properties. The ... more Land-use change from the forest to others will affect the soil’s physicochemical properties. The research was conducted to identify soil physicochemical properties affected by land-use change in Sungai Batang, the east-south part of Maninjau caldera. The research used a survey method from which soil was sampled at four different types of land use (forest, bushland, mixed garden, and paddy soil) at 0-30 cm depth with three replicates. The results show that the soil in Sungai Batang was still developing. It was indicated by coarse soil texture (clay loam to sandy clay loam). Land-use change from the forest to other uses has altered some soil physicochemical properties. It increased soil bulk density and decreased total soil porosity, permeability rate, SOM content, and total-N. However, there was an increase in soil characteristics, especially soil P-availability, CEC, Ca- and Na-exchangeable . While the soil pH (H2O), K-and Mg-exchangeable stayed the same. In general, land use ch...
A research about the role of tithonia and fist waste as liquid organic fertilizer to improve soil... more A research about the role of tithonia and fist waste as liquid organic fertilizer to improve soil chemical characteristics and increase N absorption of melon (Cucumis melo) in Ultisols was conducted at Green House of Agriculture Faculty, Andalas University. The objective of the research were to study appropriate dose of application of synthetic N fertilizer, tithonia and fish waste to improve soil chemical characteristics, also to identify tithonia and fish waste to the effect of application of synthetic N fertilizer, tithonia and fish waste to increase N absorption by melon compared to application of 100% Urea. The treatment were: A= 100% Urea, B = 50% Urea + 50% tithonia, C = 50% Urea + 50 % fish waste, D = 25% Urea + 75% tithonia, E = 25% Urea + 75% fish waste, F = 50% Urea + 25% fish waste + 25 % tithonia. Amount of N applied at each treatment was equal to 233 kg N/ha. The result showed that the optimal dose was 25% Urea + 75 % tithonia, because it improved chemical characterist...
Irrigation source is one of factors affecting physical properties of paddy soil. This research wa... more Irrigation source is one of factors affecting physical properties of paddy soil. This research was aimed to determine the impact of polluted irrigation on soil physical properties of rice field. The study site was located in Koto Nan IV (00o 54' 21.9" S and 100o 23’52.2" E), Dharmasraya Regency, West Sumatra, Indonesia. The rice field over there was irrigated with water from Momongan river in which people did gold mining illegally. For comparison, rice field receiving irrigation from non-polluted source nearby was also anaysed for the physical properties. The result showed that there was a change in physical properties of paddy soil after 7 years of getting irrigation from the river. Based on laboratory analyses, the total suspended solid (TSS) in the tailing reached 10,736 mg/L. The texture of paddy soil was dominated by sand (>50% at the top 100 cm soil depth), and it tended to linearly decrease (R2=0.65) by depth. Likewise, the sand particles also linearly decrea...
Jurnal Solum, 2008
A research entitled the effect of various sources of organic matter on improvement of N,P,K Nutri... more A research entitled the effect of various sources of organic matter on improvement of N,P,K Nutrient of Ultisol was conducted in Limau Manis Padang. The research was aimed to investigate the contribution of different source of organic matter to improve N,P,K content in soil. Field research was arranged in Randomized Block Design (RBD) consisting 5 treatments and 3 replications (blocks). Treatments are : A = no organic matter added, B = Tithonia, C = Paddy Straw, D = Imperata cylindrica, and E = Leucaena glauca. The dosage for each treatment was 20 ton/ha. The result showed that tithonia gave the best contribution in improving N,P,K content of Ultisol Limau Manis.Keywords :organic matter, N, P, K of Ultisols.
Jurnal Solum, 2011
Study about soil organic matter (SOM) leaching in soil profiles of tropical rain forest was condu... more Study about soil organic matter (SOM) leaching in soil profiles of tropical rain forest was conducted in Bukit Pinang-Pinang, the upper footslope of Mt. Gadut in West Sumatra, and in Soil Physical laboratory Andalas University Padang. Bukit Pinang-Pinang is located on 480-640 m asl and geographically is between 100°29’40” and 100°30’20 E” as well as between 0°54’55” and 0°55’45”S. This rain forest area is known as a super wet area because it receives high annual rainfall (>3500 mm). The objective of this research was to measure the amount of SOM leached from top soil into the deeper soil. Undisturbed soil samples were taken from three different land uses, forest, bush, and mixed garden, on the top, middle, and foot slopes. Undisturbed soil samples were leached with distilled water as the amount of rainfall accepted in natural condition. The results showed that, land use change from forest into ecosystems of mixed garden (for over 50 years with 100% soil surface coverage and...
Jurnal Solum, 2008
This research discusses the land suitability of mangosteen field in Kab.50 Kota Kota Payakumbuh, ... more This research discusses the land suitability of mangosteen field in Kab.50 Kota Kota Payakumbuh, predict production potential of mangosteen based on the climate suitability, soil and management its field. Composite soil sample is taken through drilling 0 – 60 cm which is carried out on research site. Quantitative model from FAO (1976) is used to evaluate the land suitability. This model combines enviromental data, climate and soil condition (soil physic and chemistry characteristic), so that production potential of field based on climate (Climate Production Potential = CPP) can be maesured quantitatively. By entering the real data of plant production, this model can predict the real plant production in a field (Land Production Potential = LPP). Result of this research shows that climate and physical condition of land are very suitability to grow mangosteen, and its level appropriateness is S1 (very suitability). Then, production potential 3 – 12 ton/ha/year can be increased to...
Jurnal Solum, 2009
Excessive utilization of natural resource by human being will affect the sustainability of agricu... more Excessive utilization of natural resource by human being will affect the sustainability of agriculture, land and environment. This is due to degradation of soil physical properties in the area. A research about study of soil physical properties had been taken out in a sub-sub watershed Batanang of Sumpur watershed, Batipuh, Tanah Datar Regency, in West Sumatra. The research was conducted by surveying the area in 2006. Disturbed and undisturbed soil samples were taken in different land units. Then, soil samples were analysed at soil laboratory, Agriculture College, Andalas University Padang. The result showed that all of land units in this sub sub watersehed had the same soil texture class, that was fine clay. The bulk volume of the soil was higher in Mixed woodland unit than those in forest land units. Permeability value of the soil was higher at forest from all degrees of slope than that at mixed woodland, even though soil organic matter content of mixed woodland unit highe...