Rice-wheat cropping system: assessment of sustainability under green manuring and chemical fertilizer inputs

By R. Yadav, B. S. Dwivedi, P. Pandey. 2000

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Long-term changes in yield and soil fertility in a twenty-year rice-wheat experiment in Nepal (2001, background): “There are indications that the yields of rice and wheat, and partial factor productivity (PFP) which is the measure of grain output for a single input, such as N, have declined (Hobbs and Morris 1996; Duxbury et al. 2000; Yadav et al. 2000).”
Modelling the quantitative evaluation of soil nutrient supply, nutrient use efficiency, and fertilizer requirements of wheat in India (2003, background): “One of the critical constraints to productivity in The model is applicable to wheat once the basic irrigated wheat is low ‘apparent’ recovery efficiency relationships between grain yield and nutrient uptake of applied nutrients (Yadav et al. 2000).”
Interactions between non-flooded mulching cultivation and varying nitrogen inputs in rice-wheat rotations (2005, background): “Midseason aeration in TF, which is practiced widely in the Chengdu plain, resulted in increased N2O emission (Cai et al., 1999; Yan et al., 2000) and this may also be responsible for gaseous N losses.”