Nutrient uptake and use efficiency of onion seed yield as influenced by nitrogen and phosphorus fertilization |
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| Authors: | Demis Fikre Limeneh Hussien Mohammed Beshir Fekadu Gebretensay Mengistu |
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| Institution: | 1. Kulumsa Agricultural Research Center, Ethiopian Institute of Agricultural Research, Asella, Ethiopia;2. fikredemis@gmail.com;4. School of Plant and Horticultural Sciences, College of Agriculture, Hawassa University, Hawassa, Ethiopia |
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| Abstract: | AbstractThe experiment was conducted at Kulumsa, South East Ethiopia, using four levels of nitrogen (N) (0, 50,100 and 150?kg N ha?1) and four levels of phosphorus (P) (0, 35, 70 and 105?kg P2O5 ha?1) fertilizers arranged in 4?×?4 factorial arrangements in randomized complete block design with three replications. The available P was increased after harvest due to the application of N and P fertilizer at the rates of 100 or 150?kg N ha?1 and 70 or 105?kg P2O5 ha?1. More specifically, nutrients concentration and nutrient uptake were significantly (p?<?.01) varied among treatment combinations and nutrient use efficiency was declined by increasing N and P after optimum rates. The higher physiological efficiency of N (53.47?kg kg?1) and P (580.41?kg kg?1) and the highest apparent recovery of N (19.62%) and P (2.47%) was recorded from application of 50?kg N ha?1 and P at 70?kg P2O5 ha?1 and the highest agronomic efficiency of N (10.78?kg kg?1) and P (15.25?kg kg?1) was recorded from N at the rate of 50?kg N ha?1 and P at 35?kg P2O5 ha?1, respectively. The combination of N at 100?kg N ha?1 and P at 70?kg P2O5 ha?1 was promising combination that generated highest net benefit 488,878.5 ETB (Ethiopian birr) ha?1 with the highest marginal rate of return (36638%) and gave the highest seed yield (1858.82?kg ha?1) with yield increment of about 57.72% over the control. |
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| Keywords: | apparent recovery physiological efficiency soil fertility use efficiency |
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