Madhavan Nair, K PBeena Maheswari, S KKAU2020-01-202020-01-201987http://krishikosh.egranth.ac.in/handle/1/5810141366PGAn experiment was conducted in the Instructional Farm attached to the College of Agriculture, Vellayani during the second crop (Mundaltan) season of 1985-86 to develop a suitable weed control method for medium duration transplanted crop o{ rice in randomised block design with 15 treatments and 3 replications. During the third crop (Punja) season a succeeding crop of cowpea was raised to assess the residual effect of the herbicides. Monocot weeds predominated throughout the crop growth. Herbicide application controlled the weed population better than handweeding twice. Thlobencarb © 1.0 kg a.i/ha as spray plus one handweeding at 35 DAT gave the highest weed control efficiency next to the completely weed free treatment. Lower dose of thloben carb or butachlor ( 1.0 kg a.i/ha ) were sufficient to increase the dry matter accumulation of crop in the earlier stages, while higher dose (1.5 kg a.i/ha) was required during later stages. Plant height, tiller count and LAI were higher in the herbicide treatments compared to the weedy check.ennullThesis