Influence of Non-Chemical Weed Management Practiceson Weed Dynamics and Productivity of Basmati Rice (Oryza sativa L.)
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Date
2023-06
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Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu
Abstract
An experiment entitled "Influence of Non-Chemical Weed Management Practices on Weed Dynamics and Productivity of Basmati Rice (Oryza sativa L.)" was conducted at Centre for Organic and Natural Farming, SKUAST- Jammu,Chatha of during Kharif seasons of 2019 and 2020. The soil of the experimental site was sandy clay loam in texture, slightly alkaline in reaction, low in organic carbon, available nitrogen and medium in available phosphorus and potassium. The experiment consisted of 13 treatments viz., stale bed fb one hand weeding at 30 DAT,wheel hoeing at 20 & 40 DAT,rice straw mulch @ 2.5 t/ha,rice straw mulch @ 5.0 t/ha,azolla 1.0 t/ha, mustard seed meal (MSM) @ 2.5 t/ha at 10 DBT,MSM @ 1.25 t/ha at puddling,MSM extract with MSM @ 0.4 t/ha at 5 DBT,MSM extract with MSM @ 0.6 t/ha at 5 DBT,MSM extract with MSM @ 0.8 t/ha at 5 DBT, MSM extract with MSM @ 1.0 t/ha at 5 DBT, weed free and weedy checkarranged in randomized block design with three replications. Stale bed technique was applied to respective experimental plots at 25 days before transplanting. The recommended dose of nitrogen was applied through FYM.
The major weed flora observed in the rice field wereEchinochloa spp., Cynodon dactylon, Comelina benghalensis, Ammania baccifera and Cyperus spp.The experimental results revealed that significantly lowest weed density and weed dry matter accumulationwas recorded in stale bed fb one hand weeding at 30 DAT and wheel hoeing at 20 & 40 DAT at 30,60, 90 DAT and at harvest as compared to weedy check. The lowest weed index and N, P, and K uptake by the weeds were recorded in the stale bed fb one hand weeding at 30 DATfollowed by wheel hoeing at 20 & 40 DAT.Weed freetreatment recorded highest growth and yield attributes i.e.plant height (cm), number of tillers/m2, dry matter accumulation (g/m2), leaf area index, grains per panicle, grain yield, straw yield and nutrient (N, P, and K) uptake by crop which were found to be statistically at par with stale bed fb one hand weeding at 30 DAT and wheel hoeing at 20 & 40 DAT.The highest protein content was recorded in weed free followed by stale bed fb one hand weeding at 30 DAT and lowest in weedy check. The highest amylose content was recorded in weedy check and lowest in weed free. Higher net returns and B:C ratio were recorded with the treatment wheel hoeing at 20 & 40 DAT followed by stale bed fb one hand weeding at 30 DAT during both the years.
Hence forth, based on the two year study, it can be concluded that among the different non chemical weed management treatments, wheel hoeing at 20 & 40 DAT and stale bed fb one hand weeding at 30 DAT were found to be most economically treatments for control of weeds in Basmati -370
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Preferred for your work. . Influence of Non-Chemical Weed Management Practices on Weed Dynamics and Productivity of Basmati Rice (Oryza sativa L.)