Nutrient and weed management for improving productivity of aromatic rice (Oryza sativa L.)

The present investigation was planned and conducted at Research Farm of Dr Rajendra Prasad Central Agricultural University, Pusa during Kharif season of 2017 to study the effect of nutrient levels and weed management on weed dynamics and yield of aromatic rice. The experiment was conducted in split-plot design and was replicated thrice. The treatments comprised three nutrient levels viz. (i) 100% RDF (120-60-40 NPK kg/ha) (ii) 75% RDF+5 t FYM (iii) 50% RDF +10 t FYM in main - plot and six weed control treatments viz. (i) Brown manuring(ii) Bispyribac-Sodium @ 25g/ha (iii) Chlorimuron Ethyl+Metsulfuron Methyl (Almix) @ 4g/ha at 20 DAT(iv) Pyrazosulfuron @ 25g/ha PoE(v) Weed free and (vi)Weedy checkin sub-plot. Rice variety Rajendra Bhagwati was transplanted on 21.07.2017. Treatment N1 (100% RDF 120-60-40NPK kg/ha) recorded maximum in growth, yield attributes and grain yield (40.37 q/ha). And among weed management practices, treatment W5 recorded the maximum value at all the growth stages and yield attributes as well as grain yield of rice. Weed population and weed dry matter were found maximum in N3 (50% RDF+10t FYM).Among the weed management practices, minimum values were recorded in W5(weed free). Weed control efficiency and weed index was maximum in W5(weed free)and W6(weedy check) respectively. Maximum net returns, gross returns and B: C ratio were recorded in N1 (100% RDF 120-60-40NPK kg/ha) under nutrient management practices. And among weed management practices, maximum value of net returns and B: C ratio were recorded under W2 (Bispyribac-Sodium @ 25g/ha). However, maximum gross returns was obtained in W5 (weed free).