CHEMICAL WEED MANAGEMENT IN DIRECT SOWN DRUM SEEDED RICE

M. BHARATHALAKSHMI¹*, T. CHITKALA DEVI², MBGS KUMARI³, V. GOWRI^4
1Regional Agricultural Research Station, Anakapalle, 531 001, Acharya N. G. Ranga Agricultural University, Lam, Guntur, 522034, Andhra Pradesh, India
²Regional Agricultural Research Station, Anakapalle, 531 001, Acharya N. G. Ranga Agricultural University, Lam, Guntur, 522034, Andhra Pradesh, India
³Regional Agricultural Research Station, Anakapalle, 531 001, Acharya N. G. Ranga Agricultural University, Lam, Guntur, 522034, Andhra Pradesh, India
⁴Regional Agricultural Research Station, Anakapalle, 531 001, Acharya N. G. Ranga Agricultural University, Lam, Guntur, 522034, Andhra Pradesh, India
* Corresponding Author : bharathalakshmim@gmail.com

Received : 14-08-2019     Accepted : 27-08-2019     Published : 30-08-2019
Volume : 11     Issue : 16       Pages : 8919 - 8921
Int J Agr Sci 11.16 (2019):8919-8921

Keywords : Weed density, Weed control efficiency, Weed index, EBT/m2, Grain yield
Conflict of Interest : None declared
Acknowledgements/Funding : Authors are thankful to Regional Agricultural Research Station, Anakapalle, 531 001, Acharya N. G. Ranga Agricultural University, Lam, Guntur, 522034, Andhra Pradesh, India for financial support under state plan project during the year 2009 and 2010
Author Contribution : All authors equally contributed

A field experiment was carried out for two consecutive Kharif seasons (Kharif 2009 and 2010) at Regional Agricultural Research Station, Anakapalle with different herbicides and time of application for management of weeds in direct sown drum seeded rice. The two years study revealed that maintenance of weed free environment by sand mix application of pre emergence weedicide anilophos @ 1.25 lt/ha at 3-5 days after sowing (DAS) or oxadiargyl @ 90 g/ha at 8-10 days after sowing resulted in higher number of ear bearing tillers / m2, higher weed control efficiency, higher grain and straw yields than other herbicides and proved as effective as two hand weedings at 20 and 40 days after sowing (DAS). The post emergence herbicide pyrazo sulfuron ethyl @ 375 g/ha was more effective than bispyribac sodium @ 250 ml/ha at 20 DAS and recorded higher yield. Reduction in grain yield to an extent of 46.4% was observed due to presence of weeds indicating the need for effective control of weeds in direct sown drum seeded rice.

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