Malik, Karmal SinghPriyanka Devi2023-02-102023-02-102022-09https://krishikosh.egranth.ac.in/handle/1/5810193578The field experiment was conducted during the kharif and Rabi season of 2020, 2021 and 2020-21, 2021-22 respectively at cotton research area, Chaudhary Charan Singh Haryana Agricultural University, Hisar. The soil of the experimental site was slightly alkaline in reaction, low in organic carbon and available nitrogen, medium in available phosphorus and available potassium. The experiment was laid out in factorial randomized block design with two mulching levels (no mulch and mulching with rice straw @ 7.5 t/ha) and seven weed management levels (Weedy check, weed free, Pendimethalin (PRE) 1.5 kg/ha fb two hoeings at 45 and 90 DAS ,Two hoeings at 30 and 60 DAS fb quizalofop-p-ethyl 62.5 g/ha at 90 DAS, Two hoeings at 30 and 60 DAS fb propaquizafop-p-ethyl 50 g/ha at 90 DAS, Pendimethalin (PRE) 1.5 kg/ha fb one hoeing at 45 DAS fb paraquat 0.5% (protected spray) at 90 DAS and Pendimethalin (PRE) 1.5 kg/ha fb one hoeing at 45 DAS fb glyphosate 1% (protected spray) at 90 DAS) with three replications. It was found that mulching with rice straw @7.5 t ha-1 resulted in significantly higher plant height, dry matter accumulation, leaf area index, seed cotton yields (3189 and 3084 kg ha-1) and its attributes, benefit cost ratio and better weed control in comparison to no mulch respectively in both years. Among weed management levels, significantly lowest plant height, dry matter accumulation, leaf area index , seed cotton yields (1841 and 1757 kg ha-1) and its attributes recorded in weedy check in comparison to other treatments while all other treatments were statistically at par with each other during both years of crop experimentation respectively. Highest weed control efficiency and herbicide efficiency index achieved with application of pendimethalin (Pre) @ 1.5 kg/ha fb one hoeings at 45 fb Glyphosate 1% (Protected spray) at 90 DAS. Lowest benefit cost ratio obtained in weedy check (1.61 and 1.42) during both years of experimentation respectively. However, there was no significant or residual effect of mulching and weed control treatments of cotton on succeeding crops (wheat, barley and mustard) observed.EnglishThesis