Effect of nitrogen, phosphorus and zinc fertilization on the economics of rice production
1985
Mahajan, R.K. | Rao, A.V. | Prasad, A.S.R. | Murthy, K.K. (All India Co-ordinated Rice Improvement Project, Hyderabad)
A replicated experiment using a 5 x 5 x 5 second-order rotatable design with N, P and Zn fertilizer variables was conducted on black soil (vertisol) during the dry season of 1980 with three rice varieties, 'Rasi', 'Jaya' and 'Mahsuri'. Only N and P showed significant response for all the varieties. The significant components, N, N2, P and P2 were used to fit quadratic production equations and also to calculate isoquants, isoclines and economic optima for the three varieties. Yield isoquants revealed that there were m1442any combinations of rates of nutrients that would result in a specific yield. Economic fertilizer optimum are given with various assumed prices for each of the three rice varieties and each of the two nutrients, N a
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