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RESIDUAL RICE HERBICIDE EFFECT ON WEED CONTROL, PRODUCTIVITY, NUTRIENT UPTAKE AND QUALITY SUCCEEDING OKRA

N. Bommayasamy,C. Chinnamuthu

Published 2024 in Plant Archives

ABSTRACT

The over utilization of pesticides has resulted in detrimental consequences on the ecosystem, with their residues affecting vital natural resources such as soil and water. Herbicide usage is steadily rising worldwide, leading to the persistence of herbicides in soil and creating residual toxicity to future crops. Furthermore, the negative consequences of agricultural effects on both animals and humans in rotation are also impacted. Hence, an investigation was conducted to evaluate the effects of residual herbicide from rice cultivation on weed control, productivity, nutrient uptake, and quality of okra during the Rabi season of 2016 and 2017. The weed control treatments include the residual effect of oxadiargyl encapsulated or loaded with biochar, zeolite, starch, water-soluble polymer, a commercial formulation of oxadiargyl and butachlor. In a Randomised Block Design with three replications, it was compared to a weed-free check, manual weeding, and a weedy check. The study found that the lingering impact of herbicides had a significant effect on both the density and dry weight of weeds during the whole growth cycle of the crop. At 20 DAS, the application of butachlor at a rate of 1.25 kg/ha, fb hand weeding at 40 DAT in rice and twice in okra, resulted in a significant reduction of 80.7% and 76.5% in weed density and dry weight, respectively, compared to the control plot with no weed management. Nevertheless, the application of butachlor at a rate of 1.25 kg/ha fb hand weeding 40 DAT in rice, and mechanical weeding twice in okra, resulted in a fruit yield that was 2.53 times higher than the yield obtained from the weedy check. The residual action of oxadiargyl loaded zeolite ensued. The weed-free check exhibited significantly greater levels of crude protein (34.6%), crude fibre (23.1%), ascorbic acid (23.6%), and mucilage content (23.9%) compared to the weedy check. Nevertheless, this was statistically similar to the remaining impact of butachlor 1.25 kg/ha fb hand weeding 40 DAT in rice, and hand weeding twice in okra. Thus, it may be inferred that the persistent impact of oxadiargyl loaded zeolite successfully managed weeds and promoted increased crop growth, productivity and nutritional quality of okra in a circumstance where manual labour is limited.

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