Tillage-water-weed interactions in intensive wet seeded rice system
1996
Bhagat, R.M. | Bhuiyan, S.I. | Moody, K. (International Rice Research Inst., P.O. Box 933, 1099 Manila (Philippines))
Intensive tillage, submergence during crop growth and extensive weeding by manual or chemical means are common practices in rice culture. In wet seeded rice, use of chemicals for weed control is essential. This study focuses on interactions of different water regimes, tillage levels and herbicide doses on the performance of wet seeded rice, with emphasis on water use and weed control efficacy. Experiments were conducted on a farmer's field with quingua loam soil in Central Luzon, Philippines during 1994-95 wet and dry season using a split-plot design. The popularly used IR-64 rice variety and pre-emergence herbicide pretilachlor (Brand name: Sofit) were used in both seasons. Results show that the combination of tillage with two plowings spaced one week between them, saturated soil water regime throughout the growing season, and half the recommended dose of pre-emergence herbicide was optimal for optimal control of weeds and water savings, without affecting rice yield. About 40 percent water was thus saved compared to the popular continuous shallow flooded condition
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