1. Alston JM, Norton GW, Pardey PG (1998) Science under scarcity: principles and practice for agricultural research evaluation and priority setting. Cornell University Press, Ithaca
2. Bhatnagar PS, Joshi OP (1999) Soybean in cropping systems in India. Integrated crop management series, plant production and protection division, 3rd edn. FAO, Rome, pp 1–39
3. Desai NC, Ardeshna RB, and Intwala CG (2000) Increasing pigeonpea productivity by providing land configuration in vertisols. Int Chickpea Pigeonpea Newslett 7:66–67
4. El-Swaify SA, Pathak P, Rego TJ, Singh S (1985) Soil management for optimized productivity under rainfed conditions in the semi-arid tropics. Adv Soil Sci 1:1–64
5. GOI (2019) Pocket book of agricultural statistics 2018. Directorate of economics and statistics. Ministry of Agriculture and Farmers Welfare, GOI, New Delhi