Vol. 12 No. 2
Weed dynamics and yield of rice under mechanized system of rice intensification
Author(s): G. PRIYANKA, K. V. RAMANA MURTHY AND A. V. RAMANA
Abstract:

Anrnexperiment was conducted at the Agricultural College Farm, Naira during kharifrn2014 and results of the field experiment revealed that at 50 DAP and atrnharvest, lowest dry weight in all group of weeds were recorded with sequentialrnpre and post emergence application of Orthosulfamuron viz., grasses (0.75 andrn0.75 g m 2) broad leaved weeds, (0.75 and 1.58 g m-2)  and sedges (0.71 and 0.91 g m-2) . It hasrnalso recorded the highest weed control efficiency (87.85%) and weed managementrnindex (1.01) than other weed management practices. Orthosulfamuron @ 100 g a.i.rnha-1 as pre-emergence sand mix application + Orthosulfamuronrn@ 100 g a.i. ha-1 as post emergence at 20-25 DAP (T10) registeredrnhighest productive tillers (232 No m-2) , grainrnyield (5489 kg ha-1) rnand benefit cost ratio (1.21).and hence was found to be effective forrnmanagement of weeds under mechanized SRI in North Coastal Zone of AndhrarnPradesh.

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