Effect of nitrogen and potassium application rates on nitrogen use efficiency and tuber minerals content in central high lands of Ethiopia (original) (raw)
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Advances in Crop Science and Technology, 2016
Field experiment was conducted at Holetta and Jeldu Agricultural Research Station in the central highlands of Ethiopia to determine the rates of Nitrogen (N) and Potassium (K) fertilizers on growth, yield and yield components of potato. 4 × 32 factorial treatment was arranged in completely randomized block design with three replications on plot size of 3 m × 3 m during 2014-2015 cropping season. Nitrogen (87 kg, 110 kg and 133 kg/ha), Potassium (0, 34.5 kg, 69 kg and 103.5 kg/ha) and potato varieties (Betete, Gudenie and Jalenie) were used. Data were analyzed by using SAS software Version 9.2. The interaction effect of potassium and nitrogen fertilizers did affect marketable tuber number and plant height significantly. Gudenie produced the highest marketable yield (30.53 ton/ha) in 2015 with application of 69 kg/ha potassium and 110 kg/ha nitrogen rates while lowest marketable yield (16.67 ton/ha) was obtained from Belete variety at 0 kg/ha potassium rate and 87 kg/ha nitrogen rate. From these results, it can be concluded that interaction of nitrogen and potassium rates affected significantly plant height and marketable tuber numbers. Therefore, it is better to apply 69 kg/ha potassium and 110 kg/ha nitrogen for potato production to obtain reasonable economic yield at sites similar to experimental locations.
East African Journal of Sciences, 2014
Potato (Solanum tuberosum L.) is an important food security and cash crop in Ethiopia. However, the yield of the crop is low in the country due to a number of factors among which poor soil fertility management is a major one. Therefore, a field experiment was conducted on the main campus of Haramaya University in the 2009/10 cropping season to elucidate the effect of mineral nitrogen and potassium fertilizers on growth and tuber production of the crop. The treatments consisted of five rates of nitrogen (0, 50,100,150, and 200 kg N ha-1) and three rates of potassium (0, 100, and 200 kg K2O ha-1). The experiment was laid out as a randomized complete block design in a factorial arrangement and replicated three times per treatment. The results of the experiment revealed that nitrogen had significant main effects on all parameters except tuber specific gravity whilst potassium did not influence any of the parameters studied. The maximum marketable ware potato tuber yield (21.4 t ha-1) was obtained in response to the application of 100 kg N ha-1. However, the highest yield (12.7 t ha-1) and number (5.2 tubers hill-1) of medium-sized tubers, which are appropriate for planting as seed, were attained at the rate of 200 kg N ha-1. Thus, it could be concluded that the rate of nitrogen fertilizer required to enhance seed tuber production was found to be higher than that required to optimize ware potato production, and potassium application was not necessary to produce the crop.
Influence of Nitrogen on Potato Productivity and Nutrient Use Efficiency
Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences, 2013
Yield and quality of potato depend on nutrient availability in soil, especially regarding nitrogen. Nitrogen (N) is a very dynamic plant nutrient and its uncontrolled application can considerably raise the price of agricultural production. If N is insufficiently utilised by plants environmental pollution can occur. The aim of the study was to investigate efficiency of nitrogen fertiliser use by potato. The field trials were carried out at the State Priekuïi Plant Breeding Institute from 2009 till 2012. Nine fertilisation variants were applied: no fertilisation; PK dose to provide potato yield of 40 t ha-1; and the remaining seven variants with a PK dose plus plus increasing N amount from 30 to 210 kg ha-1. The results of the four-year experiment years indicated that an increase in nitrogen fertilizer rate up to N120 kg ha-1 increased the potato yield. Nitrogen fertilizer rates should be applied depending on potato variety and planned use of the grown potato crop. Tuber nitrogen cont...
Journal of Biology, Agriculture and Healthcare, 2020
A field experiment was conducted at the experimental site of Wolaita sodo Universit Colleg of Agriculture during 2017 cropping season .the objective of this study was to examine effects of level of nitrogen and intra row spacing on growth of potato. The experiment was conducted on a randomized complete block design with three replications. The result of the experiment revealed significant difference among treatments with regard main stem number, plant height, leaf area, days 50% flowering, shoot fresh weight, total dry weight at(p<0.05). While the combined effect of Nitrogen fertilizer and spacing have no significant among treatments at (p<0.05). maximum growth of potato were observed for all treatments at the application rate of 138kg nitrogen per hectare and50cm intra row spacing except main stem number (10.22) which is at 30 cm, However the results of the experiment did not include yield components. Thus, a similar research should be conducted so as to assure the resu...
American Journal of Agriculture and Forestry
Field experiments were conducted at Kulumsa station of Tiyo district, southeastern Ethiopia in 2017 and 2018 offseason, to test the effect of fertilizer products on yield and yield components of potato and to evaluate the possibility of incorporating the products into input system for agricultural production. The treatment set up were 1) No input (negative control), 2) recommended rate of fertilizer (RNP) (111, 39 and 16.5 Kg ha-1 N. P and S, respectively) from NPS and Urea, 3) RNP + 1.8 L ha-1 LF; 4) RNP + 3 L ha-1 LF, and 5) RNP + 4.2 L ha-1 LF on growth performance and yield. The results showed that treatment effects were significant for potato total and marketable tuber yields. Since the effect of fertilizers on the yield of potato was consistent across seasons in Kulumsa station, combined analysis has been conducted. The highest total (46.1 t ha-1) and marketable (42.2 t ha-1) tuber yields were recorded with the application of recommended fertilizer (RNP) + 1.8 L ha-1 LF and (RNP) + 3L ha-1 LF. This treatment was even statistically superior to application of RNP alone. Compared to the control and RNP treatments, application of inorganic fertilizers with 1.8 L ha-1 LF gave 23.4 and 14.1% more total tuber yield of potato, respectively. Similarly, RNP + 3.0L ha-1 LF gave 20.9 and 13.7 % more marketable tuber yield of potato over the control and recommended fertilizer from inorganic sources (NPS and urea) treatments, respectively. The result further showed that application of 1.8 L ha-1 LF with RNP fertilizer gave total and marketable potato tuber yields which is statistically at par with yields obtained from NPS plus 3.0 L ha-1 LF. The lowest total (35.3 t ha-1) and marketable (33.4 t ha-1) tuber yields of potato were harvested from the plots that received neither inorganic nor fertilizers. Therefore, integrated application of liquid fertilizer along with full dose of inorganic fertilizers has been recommended for increased productivity of potato in the southeastern highlands of Ethiopia.
Heliyon
Ethiopia has a huge potential to increase the production and productivity of potato (Solanum tuberosum L.) mainly in northwestern regions where current potato yields are less than 10 t ha À1. Soil fertility and disease are the major yield-limiting factors of potato in this part of the country. Three-year's on-farm research was conducted to get the optimum economic levels of nitrogen (N) and phosphorus (P) nutrients for the major potato-growing areas of northwestern Ethiopia. A factorial experiment with four levels of N (46, 92, 138, and 194 kg ha À1), three levels of P 2 O 5 (46, 69, and 92 kg ha À1), and one pilot treatment with no NP nutrient inputs was used. A randomised complete block design with three replications was used. The findings of the research showed that more than 40 t ha À1 of potato could be attained (about four times the current productivity) in the study areas through NP nutrient management. The yield was increased significantly with an increased rate of N at all sites (p < 0.01). The yield difference was nonsignificant (p > 0.05) between P levels for most of the sites and years. The financial analysis of the findings for Yilmana Densa district indicated that applying 138 N and 46 P 2 O 5 kg ha À1 , together, gave a marginal return of (Birr/Birr) 70.9, whereas 138 N and 69 P 2 O 5 kg ha À1 resulted in 10.7. For the South Gondar, 138 N and 46 P 2 O 5 kg ha À1 gave a marginal return of 24.3 (Birr/Birr). Therefore, based on the farm gate price of potato and the cost of fertilizer, 138 N, combined with 69 P 2 O 5 kg ha À1 , is recommended for the Yilmana Densa. For the South Gondar, 138 N, combined with 46 P 2 O 5 kg ha À1 , is recommended.
Environmental Systems Research
Background Production and productivity of potato in Ethiopia is far below the world average because of soil fertility problem, pest, disease, and agronomic factors. Nutrient depletion because of soil erosion is a serious problem in Ethiopian highlands. Annually, 122 kg ha−1 nitrogen, 13 kg ha−1 phosphorous and 82 kg ha−1 potasium were estimated to deplete from Ethiopia (Haileslassie et al. 2005). From the essential nutrients especially, nitrogen and phosphorus are the most important influential elements for production of potato but they are deficient in most Ethiopian soils and thus an application of these nutrients could increase significantly the crop yields. Therefore, the experiment was conducted at Sekota and Lasta Lalibela districts (Woleh and Kechin Abeba irrigation command areas) of eastern Amhara, Ethiopia to investigate the effects of nitrogen and phosphorus fertilizers for yield and yield component of potato under irrigation condition. Methods Four rates of nitrogen (0, 4...
American Journal of Agriculture and Forestry, 2022
Field experiments were conducted at Kulumsa station of Tiyo district, southeastern Ethiopia in 2017 and 2018 offseason, to test the effect of fertilizer products on yield and yield components of potato and to evaluate the possibility of incorporating the products into input system for agricultural production. The treatment set up were 1) No input (negative control), 2) recommended rate of fertilizer (RNP) (111, 39 and 16.5 Kg ha-1 N. P and S, respectively) from NPS and Urea, 3) RNP + 1.8 L ha-1 LF; 4) RNP + 3 L ha-1 LF, and 5) RNP + 4.2 L ha-1 LF on growth performance and yield. The results showed that treatment effects were significant for potato total and marketable tuber yields. Since the effect of fertilizers on the yield of potato was consistent across seasons in Kulumsa station, combined analysis has been conducted. The highest total (46.1 t ha-1) and marketable (42.2 t ha-1) tuber yields were recorded with the application of recommended fertilizer (RNP) + 1.8 L ha-1 LF and (RNP) + 3L ha-1 LF. This treatment was even statistically superior to application of RNP alone. Compared to the control and RNP treatments, application of inorganic fertilizers with 1.8 L ha-1 LF gave 23.4 and 14.1% more total tuber yield of potato, respectively. Similarly, RNP + 3.0L ha-1 LF gave 20.9 and 13.7 % more marketable tuber yield of potato over the control and recommended fertilizer from inorganic sources (NPS and urea) treatments, respectively. The result further showed that application of 1.8 L ha-1 LF with RNP fertilizer gave total and marketable potato tuber yields which is statistically at par with yields obtained from NPS plus 3.0 L ha-1 LF. The lowest total (35.3 t ha-1) and marketable (33.4 t ha-1) tuber yields of potato were harvested from the plots that received neither inorganic nor fertilizers. Therefore, integrated application of liquid fertilizer along with full dose of inorganic fertilizers has been recommended for increased productivity of potato in the southeastern highlands of Ethiopia.
Maize (Zea mays L.) is the most widely grown important crop in mid altitude areas of intensive maize-based cropping system of western Ethiopia. Agronomic management is the most important input for getting potential yield and high net returns in hybrid maize production. A field experiment was carried out on farmers’ field to find out the effect of varieties (four maize) and nitrogen fertilizer rate (55, 110 kg N ha-1) with one control on yield components and nitrogen use efficiency of different maize varieties in 2013 and 2014 cropping season. It was laid with randomized complete block design in factorial arrangement with three replications. Mean grain yield, thousand seed weight, dry biomass and harvest index of maize varieties were significantly differed among farms and varieties of maize. Application of nitrogen fertilizer rates was significantly increased mean grain yield maize varieties. Interaction of maize varieties with nitrogen fertilizer rates was significantly affect...