Abdel-ghany El-gindy - Academia.edu (original) (raw)
Papers by Abdel-ghany El-gindy
Arab Universities Journal of Agricultural Sciences
Aquatic Science and Fish Resources (ASFR)
Temperature control presents a high cost for recirculating aquaculture systems (RAS). It is neces... more Temperature control presents a high cost for recirculating aquaculture systems (RAS). It is necessary to find a solution that would save energy in RAS. A heat balance for recirculating aquaculture system was developed on python program and a heat predicting model on graphic interface user (GUI) was produced with the given name of RAS designer and operation assistant. The model can predict precisely the heat energy required to be added or removed to maintain the water temperature at optimum water temperature to guarantee fish welfare and productivity. The model was validated by comparing predicted heat energy to actual heat energy. The model can predict the total annual, monthly, daily, hourly and extreme condition heating requirements, solar radiation, and water temperature.The predicted temperature of the water in the tank by the model ranged from 21.96 ºC to 33.26 ºC with an average of 27.92 ºC ± 1.34 ºC. on the other hand the actual temperature of the water in the tank ranged from 22.20ºC to 30.90ºC with an average of 28.41 ºC ± 1.16 ºC. The model gives good and promising results that are relatively realistic.
Agronomy
Evapotranspiration (ET) is a significant consumer of irrigation water and precipitation on cropla... more Evapotranspiration (ET) is a significant consumer of irrigation water and precipitation on cropland. Global and regional interest in the sustainable management of limited freshwater supplies to meet the rapidly increasing population and food demands has resulted in advanced scientific research on ET measurement, rapid water accounting, and irrigation schedules in the NENA region. The primary goal of this paper is to compare actual daily evapotranspiration (ET) collected by a remote sensing model and validated by Energy Balance (EB) flux tower field measurements. The flux tower was installed in a wheat field in Sids Agricultural Research Station in Beni Suef Governorate. Through the integration of Moderate Resolution Imaging Spectroradiometer (MODIS) Terra and Sentinel-2 data, a new remote sensing-based ET model is built on two parties: Thermal condition factor (TCF) and vegetation condition fraction (VCF). The remote sensing-based ET estimation model was evaluated using ET field mea...
The Egyptian Journal of Remote Sensing and Space Science, 2017
Traditional methods for center pivot evaluation depend on the water depth distribution along the ... more Traditional methods for center pivot evaluation depend on the water depth distribution along the pivot arm. Estimation and mapping the water depth under pivot irrigation systems using remote sensing data is essential for calculating the coefficient of uniformity (CU) of water distribution. This study focuses on estimating and mapping water depth using Landsat OLI 8 satellite data integrated with Heerman and Hein (1968) modified equation for center pivot evaluation. Landsat OLI 8 image was geometrically and radiometrically corrected to calculate the vegetation and water indices (NDVI and NDWI) in addition to land surface temperature. Results of the statistical analysis showed that the collected water depth in catchment cans is also highly correlated negatively with NDVI. On the other hand water, depth was positively correlated with NDWI and LST. Multi-linear regression analysis using stepwise selection method was applied to estimate and map the water depth distribution. The results showed R 2 and adjusted R 2 0.93 and 0.88 respectively. Study area or field level verification was applied for estimation equation with correlation 0.93 between the collected water depth and estimated values.
Recent technological advances have made soil water sensors available for efficient and automatic ... more Recent technological advances have made soil water sensors available for efficient and automatic operation of irrigation systems. Automatic soil water sensor-based irrigation seeks to maintain a desired soil water range in the root zone that is optimal for plant growth. Automatic tensiometers were buried at 30 cm depth under the sandy soil surface of Nubaria experimental station of NRC, subjected to drip irrigation system to automatically schedule irrigation for pea crop. Soil moisture potentials 70, 75 and 85 kPa, represented 3 irrigation treatments and 3 Potassium treatments 50, 75 and 100% of 100 kg fed. -1 , the officially recommended amount of Potassium fertilization for a pea crop by the ministry of agriculture in Egypt for sandy soils, were scheduled and added with the drip irrigation portions. The obtained results revealed that using soil moisture potentials 70, 75 and 85 kPa were equivalent to 85, 75 and 60% of the field capacity of the soil, respectively. The average crop...
My personal goal is to increase the living standards for our new generations by increasing the fo... more My personal goal is to increase the living standards for our new generations by increasing the food security level through the preservation of water resources and improving their efficiency used. 3. EXPERIENCE CAN BE SUMMARIZED AS FOLLOWS: Dr. Nassar holds a University Degree in Agricultural Engineering Sciences from Cairo University, Egypt, two master's degrees, one from Ein Shams Uni., Egypt, and the second from the International Centre for Advanced Mediterranean Agricultural Studies (CIHEAM), Bari, Italy. They specialize both in Water Science (Water Management) and a Ph.D. in On-Farm water management from the University of Ein Shams, Cairo, Egypt. He also got a PostGraduate Diploma in Irrigation, from CIHEAM, Bari, Italy. Dr. Nassar in 2014, took up the position as Deputy Director of Water Management Research Institute and a Senior Research Scientist. He has more than thirty years of experience in research, practical and fieldwork, identifying agricultural Engineering solutions, irrigation, drainage, new innovative technologies in garniture and food production. With experience in developing strategic partnerships and research alliances with the agricultural industry, government, universities, and research centers. The main areas of expertise are: Evaluating and Monitoring the projects, the value chain, and crop selection, participatory irrigation and drainage management, design, operation, and maintenance, large experience in programs aimed at transfer of irrigation and drainage management responsibilities to water user organizations, gender issues to water management, rural development, water resources management, and water pricing. He has gained a wide spectrum of experience due to the variety of projects' nature and fields. He published 32 scientific papers; 6 single and 26 shared and 41 technical reports. Dr Nassar has been involved in many water resources engineering projects on various scales and for different International Financing and Water Organizations. Further experiences include drainage-and irrigation engineering, Integrated Water Resources Management, infrastructure development,
Arabian Journal of Geosciences, 2014
The aim of this research was determine the ma-ximum application uniformity of closed circuit tric... more The aim of this research was determine the ma-ximum application uniformity of closed circuit trickle irrigation systems designs. Laboratory tests carried out for Two types of closed circuits: a) One manifold for lateral lines or Closed cir-cuits with One Manifold of Trikle Irrigation Sys-tem (COMTIS); b) Closed circuits with Two
among closed circuit trickle irrigation systems
Horticulturae
Potato (Solanum tuberosum L.) is an important crop in Egypt with great trade value for the export... more Potato (Solanum tuberosum L.) is an important crop in Egypt with great trade value for the export market. The addition of agrochemicals with possibly containing heavy metals, such as cadmium (Cd), decreases the quality of the final product. Generally, little is known about the factors that influence Cd content in this crop. The current study estimated the Cd levels in different organs of three potato cultivars grown in four commercial regions across Egypt. Further, we investigated the soil properties that affected Cd uptake during two growing seasons. With the exception of the Cd content of the soils, no relationships were detected between the tested soil properties (i.e., pH, conductivity, organic matter, and clay content) and Cd content in potato organs, because the soil from different regions showed comparable levels for these parameters. The average Cd content in the peeled tubers among different cultivars (0.145 mg Kg−1 DW) was below the maximum limit (0.5 mg Kg−1 DW). The patt...
Traditional methods for center pivot evaluation depend on the water depth distribution along the ... more Traditional methods for center pivot evaluation depend on the water depth distribution along the pivot arm. Estimation and mapping the water depth under pivot irrigation systems using remote sensing data is essential for calculating the coefficient of uniformity (CU) of water distribution. This study focuses on estimating and mapping water depth using Landsat OLI 8 satellite data integrated with Heerman and Hein (1968) modified equation for center pivot evaluation. Landsat OLI 8 image was geometrically and radiometrically corrected to calculate the vegetation and water indices (NDVI and NDWI) in addition to land surface temperature. Results of the statistical analysis showed that the collected water depth in catchment cans is also highly correlated negatively with NDVI. On the other hand water, depth was positively correlated with NDWI and LST. Multi-linear regression analysis using stepwise selection method was applied to estimate and map the water depth distribution. The results s...
American-Eurasian Journal of Sustainable Agriculture, 2014
Surface irrigation is considered one of the most common and extensive methods used for irrigation... more Surface irrigation is considered one of the most common and extensive methods used for irrigation in the old lands of Delta and Nile valley in Egypt. Many furrow systems operate at significantly lower efficiencies. To improve the efficiency of surface irrigation methods, the use of gated pipes is claimed to be one of the ways to achieve higher efficiencies, since it is considered one of the most efficient methods for conveying and distributing irrigation water over the entire field. Therefore, G-Pipe simulation model has been developed with the aim to simulate water distribution along the pipeline of the irrigation system for making a decision to select the optimal specification of the irrigation system. This work was carried out at the Experimental Farm of the Faculty of Agriculture, Ain Shams University, and Qalubia Governorate, Egypt. The objective of this study was to validate G-Pipe simulation model (gated pipe simulation model, developed by University of Southern Queensland, A...
Crop water requirements are represented by the actual crop evapotranspiration. Estimation of crop... more Crop water requirements are represented by the actual crop evapotranspiration. Estimation of crop evapotranspiration (ET c) and crop coefficient using remote-sensing data is essential for planning the irrigation water use in arid and semiarid regions. This study focuses on estimating the crop coefficient (K c) and crop evapotranspiration (ET c) using SPOT-4 satellite data integrated with the meteorological data and FAO-56 approach. Reference evapotranspiration (ET o) were estimated using FAO Penman-Monteith and tabled single crop coefficient values were adjusted to real values. SPOT-4 images geometrically and radio metrically corrected were used to drive the vegetation indices (NDVI and SAVI). Multi linear regression analysis was applied to develop the crop coefficient (K c) prediction equations for the different growth stages from vegetation indices. The results showed R 2 were 0.82, 0.90 and 0.97 as well as adjusted R 2 were 0.80, 0.86 and 0.96 for developing, mid-season and late-season growth stage respectively.
Misr Journal of Agricultural Engineering
The objectives of the study were to test the effect of two methods of applying nitrogen fertilize... more The objectives of the study were to test the effect of two methods of applying nitrogen fertilizer (fertigation and broadcasting), two irrigation levels and two irrigation systems surface and subsurface drip on summer squash production in the sandy soils The main results of the study could be summarized as follow:-• Applying the nitrogen fertilizers through two irrigation methods (surface and subsurface drip irrigation) was more efficiency than broadcasting fertilizers. • There are a slightly increase in crop growth, fresh yield, and both of water and nitrogen use efficiency in subsurface drip more than in surface drip. • Subsurface drip irrigation has the best water distribution in the soil. • The highest value of fertilizer use efficiency (35.60 kg) yield/kg nitrogen was obtained with treatment I2L2F2.
Misr Journal of Agricultural Engineering
Centre pivot irrigation system is a promising and precise system, for increasing the utilization ... more Centre pivot irrigation system is a promising and precise system, for increasing the utilization efficiency of unit water. Hence, A CPIM simulation model has been developed and validated, however, A CPIM model is based on crop type, weather data, and soil characteristics. The model comprises five sub-models for: (a) main sub-model; (b) data entry sub-model; (c) weather sub-model; (d) irrigation sub-model; and (e) results sub-model. The most important simulation outputs of the CPIM model include nozzle flow rate (m 3 /h), application rate (mm/h), and throw diameter (m). These outputs (outputs of 9 scenarios) were compared with observed/manufactured data for the calibration and validation of the model. Results of this comparison show that differences in model accuracy owing to different variables affecting the design and management of the center pivot were not significant. The relationships between the observed/manufactured and simulated results have a good correlation with high value of coefficient of determination and the best models are as follows: 1-Nozzle flow rate (m 3 /h) was in scenario 5 with R 2 = 0.967 and explained by an exponential model: Q SIM = 0.1067e 4.1131 (Q obs). 2-Application rate (mm/h) was in all scenarios with a very high R 2 and explained by a linear model. 3-Throw diameter (m) was in scenario 1 with R 2 = 0.942 and explained by a power model: Dw SIM = 3.9064 (Dw MFD) 0.4361 .
Misr Journal of Agricultural Engineering
The main aim of this work is to study the effect of tank diameter depth ratio on the water qualit... more The main aim of this work is to study the effect of tank diameter depth ratio on the water quality and productivity of recirculating aquacultural system to reach the optimum tank diameter: water depth ratio. The obtained results indicated that the mean weight of fish increased from 18
Australian Journal of Basic and Applied Sciences
ABSTRACT
Australian Journal of Agricultural Research
A field experiment was conducted in two successive seasons to study the effect of drip (DI), low ... more A field experiment was conducted in two successive seasons to study the effect of drip (DI), low head bubbler (LHBI) and gated pipe (GPI) irrigation systems on yield, water consumption (WC), water use efficiency (WUE) and fertilizer use efficiency (FUE) of grape (Thompson seedless) crop grown in clay loam soil in El-Kanater El-Kheiria district, Qalubia Governorate, Egypt. Yield of the 1 season st was lower than that of the 2 one. Minimum and maximum yield values were 2166; 3776, 1982; 2888 nd and 2059; 3506 kg/fed under DI, GPI and LHBI systems, in the 1 and 2 season, respectively. Grape st nd yields under DI and LHBI systems were about 9.3; 30.7 % and 3.9; 21.4 % higher relative to that under GPI one in the 1 and 2 season, respectively. According to WC, irrigation systems could be arranged st nd in the following ascending order in both seasons GPI < LHBI < DI. Water consumption increased by 89; 86 % and 86; 65 % under DI and LHBI systems relative to GPI one in the 1 and st 2 ...
Arab Universities Journal of Agricultural Sciences
Aquatic Science and Fish Resources (ASFR)
Temperature control presents a high cost for recirculating aquaculture systems (RAS). It is neces... more Temperature control presents a high cost for recirculating aquaculture systems (RAS). It is necessary to find a solution that would save energy in RAS. A heat balance for recirculating aquaculture system was developed on python program and a heat predicting model on graphic interface user (GUI) was produced with the given name of RAS designer and operation assistant. The model can predict precisely the heat energy required to be added or removed to maintain the water temperature at optimum water temperature to guarantee fish welfare and productivity. The model was validated by comparing predicted heat energy to actual heat energy. The model can predict the total annual, monthly, daily, hourly and extreme condition heating requirements, solar radiation, and water temperature.The predicted temperature of the water in the tank by the model ranged from 21.96 ºC to 33.26 ºC with an average of 27.92 ºC ± 1.34 ºC. on the other hand the actual temperature of the water in the tank ranged from 22.20ºC to 30.90ºC with an average of 28.41 ºC ± 1.16 ºC. The model gives good and promising results that are relatively realistic.
Agronomy
Evapotranspiration (ET) is a significant consumer of irrigation water and precipitation on cropla... more Evapotranspiration (ET) is a significant consumer of irrigation water and precipitation on cropland. Global and regional interest in the sustainable management of limited freshwater supplies to meet the rapidly increasing population and food demands has resulted in advanced scientific research on ET measurement, rapid water accounting, and irrigation schedules in the NENA region. The primary goal of this paper is to compare actual daily evapotranspiration (ET) collected by a remote sensing model and validated by Energy Balance (EB) flux tower field measurements. The flux tower was installed in a wheat field in Sids Agricultural Research Station in Beni Suef Governorate. Through the integration of Moderate Resolution Imaging Spectroradiometer (MODIS) Terra and Sentinel-2 data, a new remote sensing-based ET model is built on two parties: Thermal condition factor (TCF) and vegetation condition fraction (VCF). The remote sensing-based ET estimation model was evaluated using ET field mea...
The Egyptian Journal of Remote Sensing and Space Science, 2017
Traditional methods for center pivot evaluation depend on the water depth distribution along the ... more Traditional methods for center pivot evaluation depend on the water depth distribution along the pivot arm. Estimation and mapping the water depth under pivot irrigation systems using remote sensing data is essential for calculating the coefficient of uniformity (CU) of water distribution. This study focuses on estimating and mapping water depth using Landsat OLI 8 satellite data integrated with Heerman and Hein (1968) modified equation for center pivot evaluation. Landsat OLI 8 image was geometrically and radiometrically corrected to calculate the vegetation and water indices (NDVI and NDWI) in addition to land surface temperature. Results of the statistical analysis showed that the collected water depth in catchment cans is also highly correlated negatively with NDVI. On the other hand water, depth was positively correlated with NDWI and LST. Multi-linear regression analysis using stepwise selection method was applied to estimate and map the water depth distribution. The results showed R 2 and adjusted R 2 0.93 and 0.88 respectively. Study area or field level verification was applied for estimation equation with correlation 0.93 between the collected water depth and estimated values.
Recent technological advances have made soil water sensors available for efficient and automatic ... more Recent technological advances have made soil water sensors available for efficient and automatic operation of irrigation systems. Automatic soil water sensor-based irrigation seeks to maintain a desired soil water range in the root zone that is optimal for plant growth. Automatic tensiometers were buried at 30 cm depth under the sandy soil surface of Nubaria experimental station of NRC, subjected to drip irrigation system to automatically schedule irrigation for pea crop. Soil moisture potentials 70, 75 and 85 kPa, represented 3 irrigation treatments and 3 Potassium treatments 50, 75 and 100% of 100 kg fed. -1 , the officially recommended amount of Potassium fertilization for a pea crop by the ministry of agriculture in Egypt for sandy soils, were scheduled and added with the drip irrigation portions. The obtained results revealed that using soil moisture potentials 70, 75 and 85 kPa were equivalent to 85, 75 and 60% of the field capacity of the soil, respectively. The average crop...
My personal goal is to increase the living standards for our new generations by increasing the fo... more My personal goal is to increase the living standards for our new generations by increasing the food security level through the preservation of water resources and improving their efficiency used. 3. EXPERIENCE CAN BE SUMMARIZED AS FOLLOWS: Dr. Nassar holds a University Degree in Agricultural Engineering Sciences from Cairo University, Egypt, two master's degrees, one from Ein Shams Uni., Egypt, and the second from the International Centre for Advanced Mediterranean Agricultural Studies (CIHEAM), Bari, Italy. They specialize both in Water Science (Water Management) and a Ph.D. in On-Farm water management from the University of Ein Shams, Cairo, Egypt. He also got a PostGraduate Diploma in Irrigation, from CIHEAM, Bari, Italy. Dr. Nassar in 2014, took up the position as Deputy Director of Water Management Research Institute and a Senior Research Scientist. He has more than thirty years of experience in research, practical and fieldwork, identifying agricultural Engineering solutions, irrigation, drainage, new innovative technologies in garniture and food production. With experience in developing strategic partnerships and research alliances with the agricultural industry, government, universities, and research centers. The main areas of expertise are: Evaluating and Monitoring the projects, the value chain, and crop selection, participatory irrigation and drainage management, design, operation, and maintenance, large experience in programs aimed at transfer of irrigation and drainage management responsibilities to water user organizations, gender issues to water management, rural development, water resources management, and water pricing. He has gained a wide spectrum of experience due to the variety of projects' nature and fields. He published 32 scientific papers; 6 single and 26 shared and 41 technical reports. Dr Nassar has been involved in many water resources engineering projects on various scales and for different International Financing and Water Organizations. Further experiences include drainage-and irrigation engineering, Integrated Water Resources Management, infrastructure development,
Arabian Journal of Geosciences, 2014
The aim of this research was determine the ma-ximum application uniformity of closed circuit tric... more The aim of this research was determine the ma-ximum application uniformity of closed circuit trickle irrigation systems designs. Laboratory tests carried out for Two types of closed circuits: a) One manifold for lateral lines or Closed cir-cuits with One Manifold of Trikle Irrigation Sys-tem (COMTIS); b) Closed circuits with Two
among closed circuit trickle irrigation systems
Horticulturae
Potato (Solanum tuberosum L.) is an important crop in Egypt with great trade value for the export... more Potato (Solanum tuberosum L.) is an important crop in Egypt with great trade value for the export market. The addition of agrochemicals with possibly containing heavy metals, such as cadmium (Cd), decreases the quality of the final product. Generally, little is known about the factors that influence Cd content in this crop. The current study estimated the Cd levels in different organs of three potato cultivars grown in four commercial regions across Egypt. Further, we investigated the soil properties that affected Cd uptake during two growing seasons. With the exception of the Cd content of the soils, no relationships were detected between the tested soil properties (i.e., pH, conductivity, organic matter, and clay content) and Cd content in potato organs, because the soil from different regions showed comparable levels for these parameters. The average Cd content in the peeled tubers among different cultivars (0.145 mg Kg−1 DW) was below the maximum limit (0.5 mg Kg−1 DW). The patt...
Traditional methods for center pivot evaluation depend on the water depth distribution along the ... more Traditional methods for center pivot evaluation depend on the water depth distribution along the pivot arm. Estimation and mapping the water depth under pivot irrigation systems using remote sensing data is essential for calculating the coefficient of uniformity (CU) of water distribution. This study focuses on estimating and mapping water depth using Landsat OLI 8 satellite data integrated with Heerman and Hein (1968) modified equation for center pivot evaluation. Landsat OLI 8 image was geometrically and radiometrically corrected to calculate the vegetation and water indices (NDVI and NDWI) in addition to land surface temperature. Results of the statistical analysis showed that the collected water depth in catchment cans is also highly correlated negatively with NDVI. On the other hand water, depth was positively correlated with NDWI and LST. Multi-linear regression analysis using stepwise selection method was applied to estimate and map the water depth distribution. The results s...
American-Eurasian Journal of Sustainable Agriculture, 2014
Surface irrigation is considered one of the most common and extensive methods used for irrigation... more Surface irrigation is considered one of the most common and extensive methods used for irrigation in the old lands of Delta and Nile valley in Egypt. Many furrow systems operate at significantly lower efficiencies. To improve the efficiency of surface irrigation methods, the use of gated pipes is claimed to be one of the ways to achieve higher efficiencies, since it is considered one of the most efficient methods for conveying and distributing irrigation water over the entire field. Therefore, G-Pipe simulation model has been developed with the aim to simulate water distribution along the pipeline of the irrigation system for making a decision to select the optimal specification of the irrigation system. This work was carried out at the Experimental Farm of the Faculty of Agriculture, Ain Shams University, and Qalubia Governorate, Egypt. The objective of this study was to validate G-Pipe simulation model (gated pipe simulation model, developed by University of Southern Queensland, A...
Crop water requirements are represented by the actual crop evapotranspiration. Estimation of crop... more Crop water requirements are represented by the actual crop evapotranspiration. Estimation of crop evapotranspiration (ET c) and crop coefficient using remote-sensing data is essential for planning the irrigation water use in arid and semiarid regions. This study focuses on estimating the crop coefficient (K c) and crop evapotranspiration (ET c) using SPOT-4 satellite data integrated with the meteorological data and FAO-56 approach. Reference evapotranspiration (ET o) were estimated using FAO Penman-Monteith and tabled single crop coefficient values were adjusted to real values. SPOT-4 images geometrically and radio metrically corrected were used to drive the vegetation indices (NDVI and SAVI). Multi linear regression analysis was applied to develop the crop coefficient (K c) prediction equations for the different growth stages from vegetation indices. The results showed R 2 were 0.82, 0.90 and 0.97 as well as adjusted R 2 were 0.80, 0.86 and 0.96 for developing, mid-season and late-season growth stage respectively.
Misr Journal of Agricultural Engineering
The objectives of the study were to test the effect of two methods of applying nitrogen fertilize... more The objectives of the study were to test the effect of two methods of applying nitrogen fertilizer (fertigation and broadcasting), two irrigation levels and two irrigation systems surface and subsurface drip on summer squash production in the sandy soils The main results of the study could be summarized as follow:-• Applying the nitrogen fertilizers through two irrigation methods (surface and subsurface drip irrigation) was more efficiency than broadcasting fertilizers. • There are a slightly increase in crop growth, fresh yield, and both of water and nitrogen use efficiency in subsurface drip more than in surface drip. • Subsurface drip irrigation has the best water distribution in the soil. • The highest value of fertilizer use efficiency (35.60 kg) yield/kg nitrogen was obtained with treatment I2L2F2.
Misr Journal of Agricultural Engineering
Centre pivot irrigation system is a promising and precise system, for increasing the utilization ... more Centre pivot irrigation system is a promising and precise system, for increasing the utilization efficiency of unit water. Hence, A CPIM simulation model has been developed and validated, however, A CPIM model is based on crop type, weather data, and soil characteristics. The model comprises five sub-models for: (a) main sub-model; (b) data entry sub-model; (c) weather sub-model; (d) irrigation sub-model; and (e) results sub-model. The most important simulation outputs of the CPIM model include nozzle flow rate (m 3 /h), application rate (mm/h), and throw diameter (m). These outputs (outputs of 9 scenarios) were compared with observed/manufactured data for the calibration and validation of the model. Results of this comparison show that differences in model accuracy owing to different variables affecting the design and management of the center pivot were not significant. The relationships between the observed/manufactured and simulated results have a good correlation with high value of coefficient of determination and the best models are as follows: 1-Nozzle flow rate (m 3 /h) was in scenario 5 with R 2 = 0.967 and explained by an exponential model: Q SIM = 0.1067e 4.1131 (Q obs). 2-Application rate (mm/h) was in all scenarios with a very high R 2 and explained by a linear model. 3-Throw diameter (m) was in scenario 1 with R 2 = 0.942 and explained by a power model: Dw SIM = 3.9064 (Dw MFD) 0.4361 .
Misr Journal of Agricultural Engineering
The main aim of this work is to study the effect of tank diameter depth ratio on the water qualit... more The main aim of this work is to study the effect of tank diameter depth ratio on the water quality and productivity of recirculating aquacultural system to reach the optimum tank diameter: water depth ratio. The obtained results indicated that the mean weight of fish increased from 18
Australian Journal of Basic and Applied Sciences
ABSTRACT
Australian Journal of Agricultural Research
A field experiment was conducted in two successive seasons to study the effect of drip (DI), low ... more A field experiment was conducted in two successive seasons to study the effect of drip (DI), low head bubbler (LHBI) and gated pipe (GPI) irrigation systems on yield, water consumption (WC), water use efficiency (WUE) and fertilizer use efficiency (FUE) of grape (Thompson seedless) crop grown in clay loam soil in El-Kanater El-Kheiria district, Qalubia Governorate, Egypt. Yield of the 1 season st was lower than that of the 2 one. Minimum and maximum yield values were 2166; 3776, 1982; 2888 nd and 2059; 3506 kg/fed under DI, GPI and LHBI systems, in the 1 and 2 season, respectively. Grape st nd yields under DI and LHBI systems were about 9.3; 30.7 % and 3.9; 21.4 % higher relative to that under GPI one in the 1 and 2 season, respectively. According to WC, irrigation systems could be arranged st nd in the following ascending order in both seasons GPI < LHBI < DI. Water consumption increased by 89; 86 % and 86; 65 % under DI and LHBI systems relative to GPI one in the 1 and st 2 ...