杂草对油菜籽产量的影响及其复合防除指标  

INFLUENCES OF FIELD WEEDS ON RAPE YIELD AND COMPLEX CONTROL INDEXES FOR MAIN WEEDS

作　　者：陈立华 王爱兴 

机构地区：[1]上海市宝山区植保植检站,上海201901

出　　处：《上海农业学报》1998年第1期67-69,共3页Acta Agriculturae Shanghai

摘　　要：采用正交试验方法，按多元回归方法建立油菜籽产量损失率的预测模式：Y＝0．012ZX１＋0．031１X2＋0．0172X3＋4．2587，复相关系数R＝0．8766，F＝42．298，预测模式的准确率达86．8％。经统计分析，油菜田间杂草防除的经济阈值为69kg／hm2，可据此制定出油菜田间主要杂草的复合防除指标。Using orthogonal experiment and multiple regression methods,the predictingmodel for the loss rate of rape yield after weed infestation was set up as follows:Y=0. 0122X1+0. 031 1X2 + 0. 017 2X3+4. 258 7, multiple correlation coefficient R = 0. 876 6, F= 42. 298.The accuracy of the predicting model is 86. 8%. Through statistical analysis, theeconomic threshold for weed control in rape fields is 69 kg/hm2, and the complex controlindexes for main weeds in rape fields were fixed.

关 键 词：油菜籽 杂草 相关系数 正交试验 复合防治指标 

分 类 号：S451.224[农业科学—植物保护]