Weed control in irrigated wet and dry seeded rice in medium-textured soils of Northwestern India
1987
Bhol, B.B. | Singh, K.N. (Indian Agricultural Research Inst., New Delhi (India). Div. of Agronomy)
Eight weed control treatments were tested to control weeds in direct seeded rice when sprouted seeds were sown on a puddled field and when dry seeds were sown on an unpuddled bed. The trial was in a split-plot design with three replications during 1983 and 1984 monsoon seasons. The field was well-drained sandy clay loam soil. Pusa 33, 105-110 d duration and photoperiod insensitive with high yield potential was the test variety. The crop received 100-22-42 kg NPK/ha. Preemergence herbicides like oxadiazon, pendimethalin, and butachlor were applied 4-5 d after seeding (DAS); propanil was applied 21 DAS. Echinochloa colona and E. crus-galli were the predominant weed flora. Among the preemergence herbicides, oxadiazon at 0.6 kg ai/ha resulted in the best weed kill, with yields of 4.1 t dry seeded rice and 4.6 t wet seeded rice/ha. Combining propanil at 2 kg ai/ha with butachlor or pendimethalin was more effective than when the preemergence herbicides were applied alone.
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