硬草芒草猪秧秧对小麦产量的影响

EFFECTS OF Sclerochloa kengiana,Beckmannia Syzigachne AND Galium aparine ON PRODUCTION OF WHEAT IN SHANGHAI AREA

硬草、芒草和猪秧秧是麦田主要杂草，其密度越高，小麦产量损失越大。小麦产量损失率与硬草、高草和猪秧秧数量的相关式为：ｙ＝０．００９５Ｘ１＋０．０１０５Ｘ２＋０．０２９７Ｘ３十５．８０７８，相关系数ｒ＝０．９４３４，Ｆ＝４３．１２．用试验资料检验预测模式．１９９２～１９９３年进行大田预测预报，准确率达８９．５％。

Sclerochloa kengiana,Beckmannia syzigachne and Galium aparine are majorweeds in wheat fields. The higher plant number of the weeds, the more yield loss of thewheat. The correlation expression between the loss rate of wheat output and the plant numbers of Sclerochloa kengiana K,Beckmannia syzigachne and Galium aparine is:Y= 0. 009 5x1+0. 010 5 x2+0. 029 7 x3+5. 007 8,R=0. 943 4, F=43. 12.The predicting model expression was tested with experimental data and then verified infield prediction in 1992～1993,its accuracy was 89. 5 %.