Improving nitrogen and phosphorus use efficiencies through inclusion of forage cowpea in the rice–wheat systems in the Indo-Gangetic Plains of India

By B. S. Dwivedi, A. Shukla, V. Singh, Rajni Yadav. 2003

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Diversification of rice with pigeonpea in a rice-wheat cropping system on a Typic Ustochrept: effect on soil fertility, yield and nutrient use efficiency (2005, background): “With long-duration legume crops and in case where a large portion of legume biomass is removed from the field, even depletion in soil fertility has been reported (Peoples and Herridge, 1990; Rego and Rao, 2000; Dwivedi et al., 2003).”
Soil Test Based Fertilizer Application Improves Productivity, Profitability and Nutrient Use Efficiency of Rice (Oryza sativa L.) under Direct Seeded Condition (2021, background): “[28] also explained that the reason behind the higher STVs of P might be due to its fixation, due to its immobile nature in soil.”