PJB-2020-399
Efficacy of encapsulated herbicide formulations on weeds, nutrient uptake by weeds and crop of transplanted rice
Narayanasamy Bommayasamy
Abstract
Weeds are key biotic factor in lower rice production because it has wider adaptability and fast growing habits. Weeds are more competitor than crops for nutrients and deplete higher amount of soil nutrients. The experiments were carried out during Kharif season of 2016 to 2017 with the main objective to evaluate efficiency of encapsulated herbicide formulations on nutrients removal by weeds and crops of transplanted rice. Encapsulated pre-emergence herbicide exerted significant variations on grass, sedge, broad leaf weeds intensity and accumulation of biomass in entire plant growth season. Irrespective of encapsulated weed control treatments, application of oxadiargyl loaded zeolite at 3 DAT registered the highest weed control efficacy of 70.66% at 20 DAT and registered lower nutrient removal of 8.95, 4.32, 10.3 kg of NPK/ha respectively whereas, it was comparable with oxadiargyl loading biochar at 20 DAT. Butachlor application @ 1.25 kg a.i./ha + hand weeding at 40 DAT was obtained considerably more grain yield 5.34 and 5.93 t/ha during 2016 and 2017 respectively. It was comparable with oxadiargyl loading zeolite on 3 DAT. These treatments registered higher uptake of N, P and K as compared to other weed control treatments. Unweeded check recorded remarkable reduction in soil available nutrients of 224.0, 13.0, 183.5 kg NPK/ha. It could be found that application of oxadiargyl loading zeolite more effective in controlling weeds and enhancing productivity under manpower scarce situation.
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