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 |
A study was carried out during Kharif 2015 and 2016 to evaluate the effect of four nitrogen and six weed management practices on drymatter and nutrient removal by weed in direct seeded rice on a sandy loam soil at the Research Farm of Institute of Agricultural Sciences, Banaras Hindu University, Varanasi. The experiment was laid out in split plot design with 3 replications. The results revealed that the application of ¼ N basal + ¼ N at active tillering stage + ¼ N at panicle initiation stage + ¼ N at heading stage was significantly superior in reducing total weed dry matter (g m-2) at all the stages of observation and NPK removal by weeds at 60 DAS and at harvest than ½ N basal + ¼ N at active tillering stage + ¼ N at panicle initiation stage and ¼ N at basal + ½ N at active tillering stage + ¼ N at panicle initiation stage. However, it was at par with 1/3 N at basal + 1/3 N at active tillering stage + 1/3 N at panicle initiation stage. Amongst weed management practices hand weeding twice at 20 and 40 DAS followed by bispyribac at 25 g a.i. ha-1 + azimsulfuron at 17.5 g a.i. ha-1 + NIS (0.25 %) at 15-20 DAS proved most effective in reducing weed drymatter and nutrient removal by weeds as compared to other herbicidal treatments. Application of oxadiargyl at 90 g a.i. ha-1 (PE) fb bispyribac at 25g a.i. ha-1 + NIS (0.25%) at 15-20 DAS had minimum efficacy in these respect during both the years.
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