Author(s):

Shashimala Kumari, Vinay Kumar, Ravi Nandan, Rajan Kumar and Shashidhar Yadav

Abstract: 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).

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