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P.MAHESWARAREDDY,G.KRISHNAREDDY,G.PRABHAKARREDDY,K.V.NAGAMADHURI,P.SUDHAKARAND B.RAVINDRAREDDY
Scientist (Agronomy), Agronomy Division, Regional Agricultural Research Station, ANGRAU, Tirupati -517502,Chittoor (Dist.,), Andhra Pradesh.
A field experiment was conducted at farmer’s field located at K.C.Peta village of Tirupati rural mandal of Chittoor district during rabi, 2014-15 to study the effect of nitrogen and phosphorus levels on growth, yield and economics of rice under Mechanized System of Rice intensification (MSRI)in Randomized Block Design with factorial concept with four Nitrogen levels (80, 120, 160 and 200 kg N ha-1) and three phosphorus levels (40, 60 and 80 kg P2O5 ha-1) replicated thrice. Among nitrogen levels, application of 160 and 200 kg N ha-1 recorded comparable yield attributes, yield and net returns. Hence, application of nitrogen @ 160 kg ha-1 was found to be optimum dose under mechanized system of rice intensification. Non significant differences were recorded in grain and straw yields and returns among phosphorus levels and their interaction with nitrogen due to initial soil phosphorus build up. Hence, application of 160 kg N ha-1 coupled with 40 kg P2O5 ha-1 can be recommended for machine transplanted rice for realizing higher yields and returns under mechanized system of rice intensification.
Nitrogen, phosphorus, grain yield, straw yield, economics, MSRI.