Size-dependent economic thresholds for three broadleaf weed species in soyabeans.
作者： Susan E. Weaver
DOI: 10.1017/S0890037X00027536
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摘要: Soybean seed yield losses due to interference from common cocklebur, velvetleaf, and jimsonweed, with without a PPI application of 0.42 kg ai ha-1 metribuzin, were determined in 1986, 1987, 1988. Damage functions calculated based on weed density, leaf relative area index, respectively. Functions relating crop density varied significantly among treatments years for each species. Weeds which escaped soil-applied metribuzin shorter fewer leaves at 3 wk after planting, caused lower than control plants equal densities. Yield loss estimates upon planting showed least variation between treatments. Nomenclature: Metribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triane-5(4H)-one; soybean, Glycine max (L.) Merr. 'Premier'; Xanthium strumarium L. #3 XANST; Datura stramonium # DATST; Abutilon theophrasti Medik. ABUTH. Additional index words: theophrasti, stramonium, strumarium, ABUTH, DATST, XANST.
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