Author(s):

Konathala Kusumavathi, AK Mohapatra, SK Pattanayak and TR Sahoo

Abstract: A field experiment was conducted at the Agronomic Main Research Farm, Odisha University of Agriculture and Technology, Bhubaneswar to study the effect of nutrient management practices on dry matter accumulation and nutrient uptake by weeds in lowland rice during 2017-18. The treatments comprised of three main plots treatments (soil test based fertilizer 100:50:40 kg NPK ha^-1, soil test based fertilizer + green manuring with Sesbania and soil test based fertilizer + green manuring with Sesbania + liming @ 0.2 LR to green manure crop) and three sources of fertilizer in sub plots (urea + SSP + MOP, DAP as basal and urea as top dressing + MOP, urea as basal and DAP as top dressing + MOP) in a split plot design with three replications. The maximum dry biomass of weeds was found in STBF at 25 DAT and 45 DAT of rice was 0.35 and 0.15 t/ha, respectively followed by that of STBF + green manuring with Sesbania and the minimum dry biomass of weeds at 25 DAT and 45 DAT of 0.15 t/ha, 0.09 t/ha, respectively was recorded in the treatment STBF + green manuring with Sesbania + liming @ 0.2 LR to green manure crop. The dry biomass of weeds with respect to the nutrient management options at 25 and 45 DAT of rice recorded maximum value in urea + SSP + MOP followed by urea as basal and DAP as top dressing + MOP and the minimum value was recorded in DAP as basal and urea as top dressing + MOP. The nitrogen, phosphorus and potassium uptake of weeds at 25 DAT and 45 DAT of rice recorded the maximum value of 2.04, 1.36 N kg/ha, 1.10, 0.59 P kg/ha and 6.39, 3.00 K kg/ha, respectively in STBF followed by the STBF + green manuring with Sesbania and the minimum value of 0.57, 0.59 N kg/ha, 0.29, 0.26 P kg/ha and 2.28, 1.71 K kg/ha was recorded in STBF + green manuring with Sesbania + liming @ 0.2 LR to green manure crop. With respect to the nutrient management options in rice, the nitrogen, phosphorus and potassium uptake of weeds at 25 DAT and 45 DAT of rice recorded the highest value in urea + SSP +MOP followed by urea as basal and DAP as top dressing + MOP and the lowest value was recorded in DAP as basal and urea as top dressing + MOP.

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