Maximizing Rice-Wheat Productivity using Site-specific Nutrient Management Strategy

摘要

On-farm trials were conducted for two years to evaluate the effect of site-specific nutrient management (SSNM) on rice (scented) -wheat productivity. The SSNM led to significantly increase in the test weight and grain yield of wheat and rice crops in both the years as compared to the state-recommended NPK fertilisers treatment or any other nutrient management practice. On an average, SSNM increased the grain yield of wheat and rice crops by 15.6 and 11.8%, respectively, over the state-recommended NPK dose. Omitting a nutrient from the SSNM approach led to a marked reduction in the grain yield of both the crops. Decline in mean wheat grain yield was highest with phosphorus (P) omission (25.1%) followed by sulphur (S) (13.7%), zinc (Zn) (9.0%), potassium (K) (6.5%) and boron (B) (2.5%) over the full dose of SSNM treatment (NPKSZnB). Reduction in the rice grain yield due to omission of corresponding nutrients amounted to 21.1, 2.9, 8.1, 2.1 and 2.7%, respectively. On an average, N, P, K, S, Zn and B uptake by wheat and rice in SSNM plot was higher than that of the plot which had received state-recommended NPK dose. Total annual productivity of the rice-wheat system was 14% higher in the SSNM plot as compared to the plot which had received state-recommended NPK dose.