草业学报Issue(8)：44-52,9.DOI:10.11686/cyxb2014365
稗草对双季稻生长的影响及其防除经济阈值研究
Influence of barnyardgrass (Echinochloa crusgalli)on the growth of double-cropping paddy rice and its economic threshold
摘要
Abstract
Barnyardgrass (Echinochloa crusgalli )is an important weed in double-cropped paddy fields in south-ern China and a significant threat to rice production.To determine the influence of barnyardgrass on the growth of double-cropped paddy rice and its economic infestation threshold,the growth and yield of paddy rice under different barnyardgrass densities were investigated using field experiments and modelling.Results showed that plant height,tiller numbers,effective spikes,grain numbers/panicle,1000-grain weight and grain yield of double-cropped early and late rice decreased with increasing barnyardgrass density.The exponential regression model “y =beax ”was able to adequately describe the relationship between barnyardgrass density and tillers,ef-fective spikes and yield of double-cropped early rice,while a quadratic regression model “y =ax 2 +bx +c ”was best for plant height,grains/panicle,1000-grain weight and yield loss.A quadratic regression model “y =ax 2+bx +c”was best able to describe the relationship between barnyardgrass density and plant height,tillers,ef-fective spikes,grains/panicle,1000-grain weight,grain yield and yield loss of double-cropping late rice.Herbi-cides (butachlor,quinclorac,or penoxsulam)were applied to control barnyardgrass;the economic infestation <br> levels for barnyardgrass were 1.64% -2.91% and 1.28% -2.28% in double-cropped early and late paddy fields,respectively,and the economic thresholds were 0.63-1.23 plant/m2 and 1.30-1.85 plant/m2 ,respec-tively.Barnyardgrass severely inhibited rice growth and yield.Herbicide application effectively and economical-ly controlled barnyardgrass.关键词
稗草/双季稻/回归分析/经济危害允许水平/经济阈值Key words
barnyardgrass (Echinochloa crusgalli )/double-cropping paddy rice/curve fit/economic infestation level/economic threshold引用本文复制引用
张纪利,吴尚,石绪根,李保同,汤丽梅..稗草对双季稻生长的影响及其防除经济阈值研究[J].草业学报,2015,(8):44-52,9.基金项目
国家科技支撑计划课题（2012BAD14B14）资助。 （）
