Crop establishment and weed competitiveness of direct seeded anaerobic rice cultivar as influenced by seedling and water management systems
1995
Pablico, P.P. | Yamauchi, M. | Tuong, T.P. | Cabangon, R.J. | Moody, K. (International Rice Research Inst., P.O. Box 933, 1099 Manila (Philippines))
Crop establishment and weed competitiveness of anaerobic rice cultivar IR4 1996-50-2-1-3 was compared with that of standard cultivar PSBRC4 at five seeding and water management (SW) systems under intensive, selective and no weed control levels at IRRI during 1993 dry season. The SW systems tested for 15 d after seeding (DAS) were seeding onto drained field followed by intermittent irrigation to keep the field saturated, seeding onto drained field and flooding 3 DAS (modified water seeding), seeding onto drained field and flooding 7 DAS (farmer's practice), and seeding into standing water (water seeding) with 10-0-10 or 10-3-10 cm water depth cycles. Water-seeded plots had inferior seedling establishment compared with plots seeded in well-drained conditions because of poor seedling anchorage. Seeding in well-drained conditions and flooding 3 DAS greatly improved seedling anchorage. Water seeding or seeding in well-drained field and flooding 3 DAS changed the predominant weed flora from grasses to broadleaved weeds and sedges. IR41996-50-2-1-3 had higher yield across SW systems and competed better with weeds because it had better seedling establishment, faster initial growth, and higher panicle number/m2 than PSBRC4. Thus, seeding in well-drained field and flooding 3 DAS with anaerobic cultivars is a promising technology for controlling grasses and reducing herbicide costs
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