Asian Journal of Plant Sciences1682-39741812-5697Asian Network for Scientific Information10.3923/ajps.2005.574.576Oryza sativa L.) Productivity in Alfisols of Southern Districts of Tamil Nadu]]>KrishnakumarS. R. Nagarajan S.K. Natarajan D. Jawahar B.J. Pandian 6200546To optimize the NPK fertilizers requirements with hybrid rice (CORH 2) and graded levels of NPK during (Pishanam) wet season (September 2000 to January 2001), a field experiment was conducted in Alfisols of Agricultural College and Research Institute, Killikulam, Tamil Nadu. The experiment was laid out with 14 treatments of NPK combinations. The results indicated that among the treatments, application of 150:75:50 kg N: P2O5: K2O ha-1 had registered the higher grain yield of hybrid rice. The 150:50:50 kg N, P2O5 and K2O ha-1 fertilizer treatment had the higher total Phosphorus and K uptake. The N, P2O5 and K2O doses, respectively 200: 75:75; 200:10:100 and 200:50:75 kg ha-1 resulted in higher soil available N, P and K, irrespectively in post harvest soils after the CORH2 rice hybrid. The physical optimum levels for getting the maximum grain yield for the medium duration rice hybrid CORH2 was found to be 151:66:57 kg N, P2O5 and K2O ha-1. The economic optima for N, P2O5 and K2O are 149:62:56 kg ha-1, respectively for obtaining the highest grain yield.]]>Ali, M.A.,20002000pp: 13Arumugaperumal, V.,20002000Iqbal, M.T.,2004721152120Witt, C., A. Dobermann, R.J. Buresh, S. Abdulrachman and H.C. Gines et al.,2004883235Khan, A.R., D. Chandra, P. Nanda, S.S. Singh, A.K. Ghorai and S.R. Singh,200450161165Surekha, K., M. Narayana Reddy, R.M. Kumar and C.H.M. Vijayakumar,199969477481Gupta, D.K., J.P. Gupta and H. Singh,199286469Peng, S., J. Yang, F.V. Yarcia, R.C. Laza and M.V. Romeo et al.,19961996pp: 157176