Site pages
Current course
Participants
General
26 February - 4 March
5 March - 11 March
12 March - 18 March
19 March - 25 March
26 March - 1 April
2 April - 8 April
9 April - 15 April
16 April - 22 April
23 April - 29 April
30 April - 6 May
Weed Management
The competitive effects in transplanted rice are generally lower than puddled seeded system because generally rice seedlings of some age are planted in this system which has a head start over weeds initially. In puddled seeded rice the extent of competition is higher due to the fact that young seedlings suffer more from simultaneously emerging weed seedlings. Generally flooded conditions reduce the grassy weeds to a large extent.
The common weeds found in irrigated rice are sedges like Cyprus difformis, C.iria,Fimbristylismiliacea, dicots like Ludwigiaparviflora, Marseliaquadrifolia, Monochoriavaginalisand monocots likeEchinochloacrusgali, E. colonum, etc. There is a need to keep fields weed free for the first four weeks after transplanting. Hand weeding twice at20 and 40 days after planting is a common practice for controlling weeds in irrigated rice. Alternatively, rotary weeder can be used in row seeding or transplanted crop very effectively. Chemically,pre-emergence herbicides like Butachlor, Thibencarb, Pretilachlor @ 1.0-1.5 kg/ha and Anilofos @ 0.4 kg/ha and post-emergence herbicides like Propanil, 2,4-D and MCPA @ 0.5 kg/haare applied for controlling weeds. |
Last modified: Friday, 13 January 2012, 5:09 AM