Chemical Weed Control in Grassland Reseeding: Transplanted Dichanthium Annulatum and Iseilema Laxum

Abstract

An experiment was conducted on light soil at the Indian Grassland and Fodder Research Institute,Jhansi during 1969-71 to work out the suitable chemical weed control method for grassland reseeding by transplanting nursery raised grass seedlings. Pre-planting atrazine, EPTC, trifluralin, EPTC + trifluralin and DSMA @ !.S, 4.0, 1.5, 4.0 + l.S and 3.0 kg a.i./ha, respectively were investigated with and without post- emergence 2,4-0 amine @ 1.0 kg a.L/ha, Pre-planting atrazine @ 1.5 kg a.i./ha applied 20 days before grass transplanting on to the soil gave excellent control of associated weeds viz. broad leaves, grasses and Oyperus iria (annual sedge) and caused appreciable acceleration in dry matter yield of grasses. The treatment appeared to be most economical as it resulted in the maximum additional income of Rs. 1022.20 and 941.95 over no treatment from Dichanthium annulatum and lseilema laxum respectively in two continuous seasons. Pre-planting EPTC, trifluralin and their combination and posl-emergence 2,4-0 also played effective role but the magnitude of their contribution was found to be statistically inferior to the atrazine treatment.