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- W2172686039 abstract "Field experiments were conducted to predict rice yield losses caused by Echinochloa crus-galli (L.) P. Beauv., Bidens frondosa L. and Aeschynomeme indica L. at a range of plant densities under machine transplanted rice cultivation in different regions of Korea in 2006, and to determine their economic threshold levels (tE). All data were fitted to Cousens' rectangular hyperbola to estimate parameters for predicting rice yield loss. The rice yield loss models of Bidens frondosa L. was predicted as y = 5.43/(1 + 0.0113x), R 2 = 0.963 and A. indica was y = 5.47/(1 + 0.0332x), R 2 = 0.976. The mean competitivities represented by the parameter, whose reciprocal (1/β) is a weed density reducing crop yield by 50%, of E. crus-galli, B. frondosa and A. indica were 0.01552, 0.01113 and 0.0332 in normal-season machine transplanting of Korea, respectively and Single year mean economic thresholds (Ets) of E. crus-galli, B. frondosa and A. indica calculated using Cousens' equation were 1.5, 2.5, and 0.7 plants m -2 , respectively." @default.
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- W2172686039 date "2012-01-01" @default.
- W2172686039 modified "2023-09-24" @default.
- W2172686039 title "Prediction of rice yield loss from rice - A. indica (Aeschynomeme indica L.) competition in transplanted rice cultivation." @default.
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