National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Weed management in conservation agriculture is major issues for attaining sustainable crop yields. The effect of tillage, residue and weed management practices was evaluated on weed population of Medicago sativa, Chichorium intybus, Sonchus arvensis and Physalis minima among dicots, as well as the productivity of mustard in the maize-mustard-greengram cropping system during 2015-2017. The experiment was laid out in split plot design with five main plot or tillage and residue management treatments and three sub plot treatments or weed management practices and one unweeded control under zero tillage was alone maintained as additional. Results indicated that total weed density and biomass was maximum in the first year, and declined gradually in second years in especially Sonchus arvensis and Physalis minima. However, Medicago sativa and Cichorium intybus was gradually increased during second year at 60 DAT and maturity. In both year CT (M)-CT (Msr) recorded the highest weed density and weed biomass followed by CT (M)-ZT (Msr)-ZT (G). While, the lowest weed biomass was found in ZT+GR (M)-ZT+MR (Msr)-ZT+MsR (G) followed by ZT (M)-ZT+MR (Msr)-ZT+MsR (G). The highest grain and stover yield of mustard was recorded in CT (M)-ZT (Msr)-ZT (G) but CT (M)-CT (Msr) out-yielded all other treatments from 2015 onwards. The highest gross and net returns were found in Pendimethalin fb HW and isoproturon under CT (M)-CT (Msr) during the study period. However, net B: C ratio was maximum in isoproturon under CT (M)-CT (Msr) (4.34 %) during 2015-16 and CT (M)-ZT (Msr)-ZT (G) (4.52 %) during 2016-17. Application of pendimethalin at 0.75 kg ha−1 along with one hand weeding at 25 DAT recorded the lowest total weed density and biomass. This treatment also recorded higher grain yield but lower net returns compared to pendimethalin 0.75 kg ha−1 + isoproturon 1.0 kg ha−1. Overall, application of pendimethalin as PE and isoproturon as POE in ZT proved to be the most effective herbicide strategy for weed management in gobhi mustard leading to higher grain yield and net returns, irrespective of crop establishment practices.
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