Economics of nitrogen fertiliser application in rice, wheat and maize grown in the indo-gangetic plains
Published in Indian Journal of Fertilisers 8 (8) : 62-71, 2012
T. Satyanarayana, Kaushik Majumdar, Vishal Shahi, Anil Kumar, Mirasol Pampolino, M. L. Jat, V. K. Singh, Naveen Gupta, Vinay Singh, B. S. Dwivedi, Dalip Kumar, R. K. Malik, Vicky Singh, H. S. Sidhu and Adrian Johnston
Nitrogen (N) is a key factor for cereal production in India. N is predominantly supplied to the plants through fertiliser application. The average response to applied fertiliser N has been declining steadily over the past decades. As a result, farmers are compelled to apply higher doses of fertiliser N to maintain the yields of the preceding years. Considering the increasing demand of N fertiliser in the coming years, wide variability in soil N supplying capacity and wide production gaps in the predominant cereals, the present on-farm study was undertaken in the Indo-Gangetic Plains (IGP). The objective was to estimate response of cereals (rice, wheat and maize) to N application, the economics and profitability of N application with changing fertiliser price scenario. On-farm results indicated yield loss due to N omission to the tune of 667-3337 kg ha-1in rice, 500-4750 kg ha-1 in wheat and 400- 5160 kg ha-1 in maize. On the other hand, optimum use of N at observed N response levels, current and projected prices of N fertiliser and minimum support price of rice, wheat and maize had return on investment e” 3 indicating increasing significance of precise N management in cereals in the IGP. Results also suggest that advanced strategies of N management considering the indigenous N supplying capacity of soil, yield response, and agronomic efficiency of N at a given environment may become an important tool for improving farm profitability from N use in IGP.