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|Title:||Evaluation of herbicides in black gram and their residual effect on succeeding mustard crop|
|Agrotags:||Weeds, Vegetables, Control methods, Crops, Yields, Herbicides, planting, Sowing, Cultivation, Land resources|
|Abstract:||Evaluation of herbicides in black gram and their residual effect on succeeding mustard crop was studied at Research farm of Department of Agronomy, CCSHAU, Hisar during kharif 2013 and Rabi 2013-14. Weed flora of the experimental field was dominated by Trianthema portulacastrum (83%), Cyperus rotundus (15%) and Convolvulus arvensis (2%) at 30 DAS. PRE application of imazethapyr + pendimethalin (RM) at 1000 g ha -1 provided excellent control (90%) of Trianthema portulacastrum up to 30 DAS. At 60 DAS, percent control with this treatment decreased to 73% which was at par with two hoeings employed at 20 & 40 DAS and pendimethalin at 1000 g ha -1 used as PRE. Post-emergence use of imazethapyr + imazamox (RM) at 60-80 g ha -1 exhibited 78-83 % control of weeds with slight crop suppression which mitigated within 10-15 days after spray but resulting adverse effect on crop growth and yield. Early post-emergence application of imazethapyr at 50, 60 and 70 g ha -1 although caused mild injury to black gram in terms of yellowing of leaves and stunted crop growth up to 30, but it diminished within two weeks. Maximum seed yield (903 kg ha -1 ) of black gram was obtained with two hoeings at 20 & 40 DAS which was at par with imazethapyr + pendimethalin (RM) at 1000 g ha -1 and pendimethalin at 1000 g ha -1 applied as PRE. All herbicides, irrespective of their dose and time of application, did not cause any injury to mustard planted as succeeding crop after harvest of black gram due to enhanced microbial degradation of herbicides due to high rainfall (477 mm) during crop growing season.|
|Appears in Collections:||M. Sc. Dissertations|
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