Integrated nutrient management (INM) on yield trends and sustainability,nutrient balance and soil fertility in a long-term (30 years) rice-wheat system in the Indo-Gangetic plains of India |
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| Authors: | Sushanta Saha Bholanath Saha Manabendra Ray Swapan Kumar Mukhopadhyay Pallabendu Halder Anupam Das |
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| Institution: | 1. Directorate of Research, Bidhan Chandra Krishi Viswavidyalaya, Kalyani, India;2. Department of Soil Science and Agricultural Chemistry, Dr. Kalam Agricultural College, Bihar Agricultural University, Kishanganj, India;3. Department of Soil Science and Agricultural Chemistry, Bihar Agricultural University, Bhagalpur, India |
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| Abstract: | We analyzed data from a long-term rice–wheat cropping sequence to evaluate the effects of integrated nutrient management (INM) on yield trends and sustainability, nutrient balance and soil fertility of the system. After 30th cycle, grain yield of both the crops significantly declined under control and highest rice and wheat grain yields were obtained when 50% N supplied through green manure and farm yard manure, respectively. The magnitude of yield slope under INM was found considerably higher than 100% recommended fertilizer (RDF). Sustainable yield index (SYI) for both the crops were found lower in control but considerably higher with the 100% RDF and under INM. The soils under all the treatments suffered an apparent loss of K and N (except where organics replacing 50% N). Correlation study also reveals K is the sole factor for the yield sustainability as apparent K balance was negatively correlated with SYI and yield slope. |
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| Keywords: | apparent nutrient balance FYM green manure rice-wheat sustainable yield index yield trends |
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