Weed Management Practices on Weed Characters, Plant
Growth and Yield of Rice Under System of Rice Intensification
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Author:Sadhana R. Babar and A. Velayutham
p-ISSN:0024-9602, e-ISSN:2582-5321, Vol:99, Issue:jan-mar
DOI: https://doi.org/10.29321/MAJ.10.100012
Abstract
A field experiment was conducted during Kharif 2009 at Tamil Nadu Agricultural University,
Coimbatore to evaluate weed management practices for System of Rice Intensification (SRI).
The treatments comprised of different weed management practices viz., recommended
weed management practice i.e. 4 times conoweeding from 10 DAT at 10 days interval and
conoweeding 3 times at 20, 30 and 40 DAT. These two treatments in single and in combination
with three different herbicides viz., almix @ 20 g a.i. ha -1 , butachlor @ 1 kg a.i. ha-1 and pretilachlor
@ 0.75 kg a.i. ha -1 were tested along with unweeded control treatment. The weed flora of the
experimental field were Echinochloa crus-galli (L.), Cyperus difformis (L.), Eclipta alba (L.)
and Ammania baccifera (L.). The results revealed that application of pretilachlor as PE @ 0.75
kg a.i. ha -1 + 4 times conoweeding from 10 DAT at 10 days interval (T 5 ) was very effective in
controlling the weeds and recorded the least weed density. The weed control efficiency
(total and grassy weeds) as well as the plant growth components and yield were higher
when rice was applied with Pretilachlor @ 0.75 kg a.i. ha -1 as pre-emergence + 4 times
conoweeding from 10 DAT at 10 days interval, which was followed by the treatment of
application of butachlor @ 1 kg a.i. ha -1 as pre-emergence + 4 times conoweeding from 10 DAT
at 10 days interval.
Key words : SRI, weed management, Almix TM , butachlor, pretilachlor, growth components, yield.