Andhra Pradesh High Yield Hybrid Rice-Soybean Cropping System Requires More NPK
By T. Nagendra Rao
Large scale adoption of hybrid rice cultivation in India offers a promising solution to feed the vast, growing population of the country. Soybean in succession is a preferred crop to grow on residual soil fertility in certain areas of South India.
Scientists at Acharya N G Ranga Agricultural University (ANGRAU), Hyderabad found that assured plant nutrient supply is imperative especially to the main rice crop in order to realize high yields in the hybrid rice-soybean cropping sequence. Highest rice yield of 6.12 t/ha was achieved in the treatment receiving 180-105-210 kg N-P2O5-K2O/ha, while the state fertilizer recommendation (120-60-30 kg/ha N-P2O5-K2O) produced only 3.98 t/ha of rice. Soybean in succession, when grown on the residual soil fertility of the MYR dose, recorded 0.7 t/ha grain yield, while the yield on the state fertilizer recommendation plot produced a low yield of 0.43 t/ha (Table).
MYR : Maximum Yield Research dose based on soil test
SR: State recommended dose for rice crop
State Fertilizer Recommendation (L) vs MYR
Source: Annual Report (1999-2000) - PPIC supported Research Project “Nutrition and Performance of Crops in Rice (Hybrid) –Legume Cropping Sequence Under High Levels of N, P and K Applications”
Dr. A. Sreenivasa Raju, Dr. P. Chandrasekhar Rao, Dr. (Mrs.) M. Shanti, Department of Soil Science and Agricultural Chemistry, College of Agriculture, Acharya N G Ranga Agricultural University, Rajendranagar, Hyderabad - 500 030, Andhra Pradesh, India.
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