How weed can be controlled in rainfed areas.
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Answer:
Early establishment of rainfed rice by dry seeding at the onset of the monsoon rain plays a crucial role in increasing the land productivity of rainfed areas. However, farmers are constrained to adopt dry-seeding is because of high weed infestation. Experiments were conducted in CLSU and MMSU to determine the influence of dry seeding by drill seeder and drum seeder and wet-seeding by drum seeder and weed control methods on dry matter, grain yield of rice and weed population under rainfed condition. Results showed that grain yield of PSB Rc14 was highest (about 2-3 t/ha) when rice was drum seeded. Influence of the weed control treatments on the yield of wet seeded rice were similar. However, dry-seeded rice was lower by 1-2 t/ha than wet-seeded rice. Use of herbicide in the dry-seeded plots increased the dry matter yield and decreased the weed population. For wet-seeded rice, initial weed infestation was controlled by the land preparation, so use of herbicide or hand weeding was minimized. Use of Oxadiazon for weed control for dry-seeded rice as alternate to more laborious handweeding can provide an opportunity to increase cropping intensity in rainfed areas.
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