Weed seedlings transplanted with rice seedlings reduce grain yield [Philippines]
1987
Rao, A.N. | Moody, K. (International Rice Research Inst., Los Banos, Laguna (Philippines))
It was observed that grass weed seedlings had been transplanted with rice seedlings in two farmers' fields in Guimba, Nueva Ecija, Philippines. These were harvested from 50 1-square meter quadrats from areas in both fields where transplanted seedlings were contaminated with weed seedlings and 50 1-square meter quadrats from areas where no weed seedlings had been transplanted. In one field, yield from quadrats where an average of 29% of the hills were infested with Echinochloa glabrescens was 372 g/square meter; in areas where no weed seedlings were transplanted, the yield was 476 g/square meter. In the other field, yield from quadrats where an average 23% of the hills were infested with Echinochloa oryzoides was 434 g/square meter, 18% lower than the 530 g/square meter yield where no infestation was observed. Differences in yield between the weed-infested and weed-free hills were highly significant in both fields
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