Ecology, Environment and Conservation Paper

CHEMICAL WEED CONTROL IN DIRECT SEEDED RICE UNDER RAINFED CONDITION

Narender Jannu, M. Srinivasa Raju and K. B. Sunitha Devi

Abstract

A field experiment was conducted on sandy clay loam soils during kharif 2010 at Agricultural College Farm, Acharya N.G. Ranga Agricultural College, Rajendranagar, Hyderabad to study the influence of different herbicides on weed growth, crop growth of direct seeded rice under rainfed condition. The experiment was laid out in randomized block design with eleven weed control treatments and the treatments were replicated thrice. The results indicated that the lowest weed density and minimum dry matter production of weeds and higher weed control efficiency (82.13%) were recorded with Cyhalofop-butyl+ (Chlorimuron-ethyl+Metsulfuron-methyl) @ 90+20 g ha-1 applied as post emergence herbicide at 30 DAS. As regards to the effect of treatments on rice crop, it was found that plant height (94.4 cm), tillers per m2 (284), dry matter production (874.5 g per m2 ) were significantly higher with treatment Cyhalofop-butyl + (Chlorimuron-ethyl+Metsulfuron-methyl) @ 90+20 g ha-1 in comparison to all treatments except two hand weedings at 20 and 40 DAS. Significantly lower tillers per m2 were observed with Weedy check followed by Fenoxaprop-p-ethyl @ 60 g ha-1.