空心莲子草对移栽水稻的为害损失及经济阈值研究  

STUDIES ON THE TRANSPLANTING RICE YIELD LOSS CAUSED BY WEED Alternanthera philoxeroides AND ITS ECONOMIC THRESHOLD

作　　者：张俊喜[1] 李慈厚[1] 娄远来[2] 邓渊钰[2] 仇彩云[1] 

机构地区：[1]江苏沿海地区农科所,盐城224002 [2]江苏省农业科学院植物保护研究所,南京210014

出　　处：《上海农业学报》2004年第1期95-98,共4页Acta Agriculturae Shanghai

基　　金：江苏省 (BE2 0 0 13 48);盐城市 (YK2 0 0 115 4)农业科技攻关项目的一部分

摘　　要：为明确空心莲子草 (Alternantheraphiloxeroides) 的发生对移栽水稻产量及其构成因素的影响 ,采用人工接种空心莲子草进行不同密度对移栽水稻为害损失测定试验。 2 0 0 2年研究结果表明 ,空心莲子草发生密度和移栽水稻产量及每穗实粒数、有效穗数、粒重的最佳数学模型均为直线函数关系 ,方程分别为 :Y =82 88.6 - 32 7.3X ,Y1 =94 .0 90 - 2 .82 2X ,Y2 =17.15 3- 0 .14 8X ,Y3=2 6 .30 5 - 0 .15 6X。试验安排密度范围内 ,空心莲子草的发生为害可对移栽水稻产量、每穗实粒数造成极显著损失 ,对有效穗数和粒重造成的损失不显著。经济阈值计算结果表明 ,用使它隆 (fluroxypyr)进行防除 ,当空心莲子草在移栽稻田初始发生密度达 0 .6 9株 m2 以上时 ,即需用药防除。The experiment of transplanting rice yield loss under different densities of Alternanthera philoxeroides were made in 2002 in order to study the effects of this weed occurring on the rice yield and its components. The experimental results showed that the yield (Y), filled grains per spike (Y 1), productive spikes per bunch (Y 2) and 1000-grain weight (Y 3) all related to the weed density (X). Their optimum regressionequations were Y=8288.6-327.3X,Y 1=94.090-2.822X,Y 2=17.153-0.148X and Y 3=26.305-0.156X,respectively. Within the designed range of the weed density, the weed occurring could cause very significant losses of the yield and filled grains per spike, but not significant losses of productive spike number and grain weight. The result of calculating the economic threshold showed that itwas necessary to apply fluroxypyr to transplanting rice field when the initial density of the weed was over 0.69 plants/m2.

关 键 词：空心莲子草 移栽水稻 危害 经济阈值 试验设计 

分 类 号：S451.2[农业科学—植物保护]