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- W2376107983 abstract "The occurrence and infestation of bamyardgrass,Echinochloa crusgalli Beauv.,in paddy fields constitutes a major threat in rice production.To determine the influence of barnyardgrass on the growth of pad- dy rice and its economic infestation level,additive series experiment and curve fit were adopted to study the change of rice yield characters under different density of barnyardgrass.The results showed that with the inter- ference of barnyardgrass,the tillers,effective spikes,1000-grain weight and yield of paddy rice decreased gradually as the weed density increased.The exponential regression model y=be~(ax) was relatively better for de- scribing the relationship between barnyardgrass density and rice tillers (y =493.74e~(-0.0164x),p0.0001),ef- fective spikes (y=437.2e~(-0.0165x),P0.0001)and 1000-grain weight (y=21.876e-(0.0006x),P0.005), while logarithmic regression model y=aLnx+b was the best for rice yield (y=-1250.4Lnx+6375.4,P 0.0001)or yield loss (y=18.844Lnx+3.9182,P0.0001).When herbicide such as acetochlor+bensul- furon-methyl,butachlor,molinate or quinclorac was used to control barnyardgrass in paddy fields,the eco- nomic infestation level for barnyardgrass was 0.71%-1.10% and the economic threshold was about 0.85 plant/m~2." @default.
- W2376107983 created "2016-06-24" @default.
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- W2376107983 date "2005-01-01" @default.
- W2376107983 modified "2023-09-26" @default.
- W2376107983 title "Influence of barnyardgrass,Echinochloa crusgalli,on the growth and yield of paddy rice and its economic threshold" @default.
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