Phosphorus Enriched Organic Amendments can Increase Nitrogen Use Efficiency in Wheat |
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| Authors: | Siddhartha Sankar Biswas Avijit Ghosh Sunil Kumar Singhal Trisha Roy Abhijit Sarkar |
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| Institution: | 1. Division of Soil Science and Agricultural Chemistry, ICAR-Indian Agricultural Research Institute, New Delhi, India;2. ICAR-Indian Grassland and Fodder Research Institute, Jhansi, India;3. ICAR-Indian Institute of Soil and Water Conservation, Dehradun, India;4. ICAR- Indian Institute of Soil Science, Bhopal, India |
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| Abstract: | Although nitrogen (N) has the highest requirement for plant growth, N use efficiency (NUE) seldom exceeds 40%. NUE may be improved by integrated application of fertilizer N and enriched organic amendments. The present experiment aimed to test the extent of increase in NUE by integrated application of fertilizer N farmyard manure (FYM) and rock phosphate enriched compost (RPEC). Mineralization kinetics and N release from FYM and RPEC were studied by an incubation experiment. Results revealed that maximum potentially mineralizable N as well as N release (283.9, 186.7 mg kg?1 soil, respectively) were from RPEC + fertilizer N treated soils, followed by FYM + fertilizer N. Maximum yield, N uptake, and N recovery were obtained from RPEC + fertilizer N treated soils followed by FYM + fertilizer N. Soils treated with RPEC had shown significantly higher dehydrogenase activity than FYM treated soils. Thus, RPEC might increase yield as well as NUE over FYM. N uptake by plant at maximum tillering stage and flowering stage of wheat correlated positively (R2 > 0.85) with the decay rate (k and kN0) parameter of incubation experiment suggesting their relevance as indicators of plant available N. |
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| Keywords: | Release kinetics farmyard manure rock phosphate enriched compost nitrogen use efficiency |
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