Nutrient and weed managementin rice rice cropping sequence

Abstract

A field experiment entitled Nutrient and weed management in rice-rice crop sequence was newlineconducted in ICR Farm of Assam Agricultural University, Jorhat, with autumn and winter rice newlinevarieties, Luit and Ranjit, grown in sequence for two years, 2018 and 2019. The investigation, newlinelaid out in randomized block design (factorial) with three replications, aimed to study the impact newlineof nutrient and weed management on growth and yield attributes of rice, weed dynamics and newlinechanges in soil microbiota. The treatment consisted of four Nutrient managements viz. T1-100% newlineN-P2O5-K2O through inorganic fertilizers (recommended dose of 40-20-20 kg/ha)), T2-75% N newlinethrough inorganic + 25% N through FYM (P2O5 and K2O recommended doses), T3-75% N newlinethrough inorganic + 25% N through vermicompost (P2O5 and K2O recommended doses) and T4- newline75% N through inorganic + 25% N through Crop residues and bio-fertilizer (P2O5 and K2O newlinerecommended doses); three weed management treatments viz: W1-Pyrazosulfuron at 25g/ha + newline2,4-D at 0.5kg/ha in both autumn and winter rice,W2-Pyrazosulfuron at 25g/ha + 2,4-D at newline0.5kg/ha in autumn rice rotated with Pretilachlor at 0.75 kg/ha + 2,4-D at 0.5kg/ha in winter newlinerice and W3-Pyrazosulfuron at 25g/ha + 2,4 D at 0.5kg/ha in autumn rice and only Pretilachlor newlineat0.750kg/ha in winter rice; and two controls viz: C0- Absolute control and C1- Farmer s practice newline[(0.750 kg/ha pretilachlor + N-P2O5-K2O (20-10-10 kg/ha)]. Soil of the experiment site was newlinesandy loam in texture, slightly acidic (pH-5.6) in reaction, medium in organic carbon (0.65%), newlineavailable N (222.63 kg/ha), available P2O5 (21.18) and available K2O (127.71 kg/ha). newlineThe results of the two years of experiment indicated that among the nutrient management newlinetreatments, significantly higher growth attributes, yield attributes, N-P2O5-K2O content and NPK newlineuptake by rice was observed with treatment T3 (75% N through inorganic + 25% N through newlinevermicompost) and the lowest was observed lowest in treatment T1 (100% N-P-K through newlineinorganic fertilizers) in both the years of autumn and winter ...