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 field experiment was undertaken during kharif of the year 2016 at the Research Farm of Dr. Rajendra Prasad Central Agricultural University, Pusa (Samastipur), Bihar to study the “Effect of weed management and nitrogen on weed dynamics and yield of rice under aerobic condition”. The experiment was conducted in split plot design having three levels of nitrogen in main plots (N1-120kg N/ha, N2-140kg N/ha and N3-160 kg N/ha) and six weed management practices [W1- Pyrazosulfuron @ 25g/ha (20 DAS), W2-Bispyribac sodium @ 25g/ha (20 DAS), W3-Pyrazosulfuron @ 25g/ha + Bispyribac sodium @ 25g/ha (20 DAS), W4-Pendimethalin @ 1000g/ha (PE)+ W3 (20 DAS), W5-Weed free (2 Hand weeding at 20 and 40 DAS) and W6-Weedy check] in sub plots, replicated thrice with Abhishek as the test variety. The results pertaining to weed population and weed dry weight by crop separately were a close reflection of growth and yield pattern in which the pre and post-emergence applications of Pendimethalin @ 1000 g/ha + Bispyribac sodium @ 25 g/ha + Pyrazosulfuron @ 25 g/ha established its superiority over the rest of the herbicidal treatments except in weed free condition wherein all these characters were superior in sub plots. Weed control efficiency of 2 hand weeding (70.81%) was superior to Pendimethalin @ 1000g/ha + Bispyribac sodium @ 25g/ha + Pyrazosulfuron @ 25g/ha (66.13%), Bispyribac sodium @ 25g/ha + Pyrazosulfuron @ 25 g/ha (59.83%), Bispyribac sodium @ 25g/ha (51.48%) and Pyrazosulfuron @ 25g/ha (40.40%). Pendimethalin @ 1.0 kg/ha fb Pyrazosulfuron @ 25g/ha + Bispyribac @ 25g/ha recorded highest grain yield (37.50q/ha) and straw yield (48.75q/ha) after manual weeding. High cost involved in manual weeding makes herbicidal treatments more viable proposition. Bispyribac sodium @ 25g/ha + Pyrazosulfuron @ 25g/ha, Bispyribac sodium @ 25g/ha alone and Pendimethalin @ 1000g/ha + Bispyribac sodium @ 25g/ha + Pyrazosulfuron @ 25g/ha are three most effective herbicidal combination treatments in direct seeded rice under aerobic condition.
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