WEED CHARACTERS AND INDICES OF TRANSPLANTED RICE AS INFLUENCED BY DIFFERENT WEED MANAGEMENT PRACTICES

R. SURESHKUMAR¹*, NALLIAH S. DURAIRAJ², S. MARIMUTHU³, M. MUTHUKUMAR^4
1Department of Agronomy, AC & RI, Coimbatore, Tamil Nadu Agricultural University, Tamil Nadu, 641 003, India
²Department of Agronomy, AC & RI, Killikulam, Tamil Nadu Agricultural University, Tamil Nadu, 628 252, India
³Department of Agronomy, AC & RI, Coimbatore, Tamil Nadu Agricultural University, Tamil Nadu, 641 003, India
⁴Department of Agricultural Entomology, AC & RI, Coimbatore, Tamil Nadu Agricultural University, Tamil Nadu, 641 003, India
* Corresponding Author : suresh2k589@gmail.com

Received : 13-07-2016     Accepted : 01-08-2016     Published : 27-10-2016
Volume : 8     Issue : 51       Pages : 2221 - 2223
Int J Agr Sci 8.51 (2016):2221-2223

Keywords : Rice, Butachlor, Weed management
Conflict of Interest : None declared
Acknowledgements/Funding : None declared
Author Contribution : None declared

During rabi season (2011-2012) a field trial was conducted at Agricultural College and Research Institute, Killikulam, Tamil Nadu as part of M.Sc., research programme. The experiment was consisted of 12 treatments laid out in randomized block design with replicated thrice. The treatments comprised of application of pre-emergence herbicides viz., butachlor 50 % EC @ 1.25 kg/ha, oxadiargyl 80 % WP @ 70 g/ha, bensulfuron methyl 0.6 % + pretilachlor 6 % GR @ 660 g/ha, metsulfuron methyl 10 % + chlorimuron ethyl 10 % WP @ 4 g/ha on 3 DAT along with post-emergence herbicide 2, 4-D Na salt @ 1.25 kg/ha or hand weeding on 35 DAT. In addition, the hand weeding twice, rotary weeding twice, weed free and weedy check treatments for comparison. The weed flora of Cynodon dactylon, Echinochloa crus-galli, Echinochloa colona, Cyperus difformis, Cyperus iria, Cyperus rotundus, Marsilea quadrifolia, Ammania baccifera, Commelina benghalensis and Eclipta prostrata were observed. It has been learned through experiment results that pre-emergence application of bensulfuron methyl + pretilachlor at 660 g/ha on 3 DAT with one hand weeding on 35 DAT recorded significantly higher grain yield (6710 kg/ha), lower weed population (31.33 No. /m2) and their dry weight (37.80 kg/ha), higher weed control efficiency (91.76%), weed control index (99.06%) and lower weed index (1.32).