Modelling the quantitative evaluation of soil nutrient supply, nutrient use efficiency, and fertilizer requirements of wheat in India

By H. Pathak, Pramod K. Aggarwal, R. Roetter, N. Kalra, S. K. Bandyopadhaya, Shiv Prasad, H. Keulen. Nutrient Cycling in Agroecosystems, 2003

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Fertilizer requirements for wheat and maize in China: the QUEFTS approach (2006, methodology): “The IE ‘borderline’-values of N, P and K for wheat are close to values suggested by Pathak et al. (2003).”
Establishment of threshold leaf colour greenness for need-based fertilizer nitrogen management in irrigated wheat (Triticum aestivum L.) using leaf colour chart (2012, background): “As soil N exists argely in organic forms, soil organic carbon status has been freuently used as an index for soil N supply (Pathak et al., 2003). owever, kinetics of N release from soil organic matter and crop esidues is very dynamic and the time and quantity of N supply from he soil always remain…”
Field-specific potassium and phosphorus balances and fertilizer requirements for irrigated rice-based cropping systems (2010, result): “Pathak et al. (2003), using a smaller data set from India, reported a higher RIE for K (28.5) and a comparable RIE for P (3.5), and Liu et al. (2006), using a data set from China, reported relatively comparable RIE for K (23.0) and P (3.7).”