Effect of entrapped slow release pre-emergence herbicide oxadiargyl with zeolite, biochar, starch and water soluble polymer formulations on weed control duration and yield of transplanted rice

Abstract

Field experiment was carried out during kharif, 2016 at Agricultural College and Research Institute, Madurai in order to study the effect of slow release herbicide formulations on growth and yield of transplanted rice. Weed control treatments significantly reduced the total weed density and total weed dry weight over weedy check both at 20 and 40 DAT. Application of oxadiargyl loaded with zeolite on 3 DAT recorded significantly less total weed dry weight of 9.62, 19.64 g m-2 at 20 and 40 DAT, respectively. Weed free check treatment recorded the maximum grain yield of 5830 kg ha-1. Among the weed control treatments, application of butachlor @ 1.25 kg ha-1 on 3 DAT fb hand weeding on 40 DAT and application of oxadiargyl loaded with zeolite on 3 DAT(T2) were on par with each other with 86.7 and 77.1 per cent higher grain yield respectively over weedy check.