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- Title
Weed control in irrigated dry seeded rice.
- Authors
Ghobrial, George I.
- Abstract
Large losses in grain yields due to weed competition were found in studies conducted in irrigated dry seeded rice at Gezira Research Station, Sudan. These losses could exceed 50%. Weed competition lowered panicle number per unit area by 37%, number of filled grains per panicle by 13%, and weight of 1000 grains by 4%. Tillering was the critical growth phase most affected by weed competition. Grain yields were increased as number of hand weedings increased. The best yield (4.1 t/ha) was obtained from 3-4 weedings carried out at 15, 30, 45 and 60 days after rice emergence. Oxadiazon (0.5 kg/ha) gave good residual weed control of the dominant weed species, <em>Phyllanthus niruri</em> L., <em>Leucas urticifolia</em> L., <em>Heliotropium</em> F.W.Andr. and <em>Echinochloa colona</em> (L.) Link, for 6-7 weeks. The combination with continuous flooding from 6 weeks after rice emergence gave excellent weed control during the entire season, and comparable or even better yields than frequently weeded rice.
- Subjects
WEED control; RICE; GRAIN; ECHINOCHLOA; GRASSES
- Publication
Weed Research, 1981, Vol 21, Issue 5, p201
- ISSN
0043-1737
- Publication type
Article
- DOI
10.1111/j.1365-3180.1981.tb00118.x