移栽油菜田杂草防除临界期初步研究  

Preliminary studies on the critical control stage of weeds intransplanting oilseed fields

作　　者：杨燕涛[1] 张洪进[1] 王东华[1] 张夕林[1] 

机构地区：[1]江苏省通州市植保站,江苏通州226300

出　　处：《植保技术与推广》2002年第4期27-28,共2页Plant Protection Technology and Extension

摘　　要：油菜移栽后不同时间除草的试验表明,油菜移栽后的有草天数与油菜籽产量损失率之间是logistic曲线关系。曲线的两个拐点为t1=39.7d,t2=92.3d。在t1之后和t2之前,损失率增长迅速。因此,t1=39.7d可作为杂草与油菜的竞争临界期。应用时,可掌握为油菜移栽后40～45d。因此,油菜田除草应掌握在油菜移栽后45d之前。The result of the test of controlling oilseed field weeds at different time after transplanting showed that there is logistic curve relationship between the days of weeds keeping in the field and the loss of oilseed. In the curve, the two turn value are t1=39.7d and t2=92.3d. And between t1 and t2, the loss ration increase quickly, suggesting that t1 should be regarded as the challenge critical stage between weeds and oilseed in 40 to 50 days after transplanting. Based on the result, weeds should be controlled in 45 days after transplanting.

关 键 词：油菜田 杂草 防除临界期 

分 类 号：S451.224[农业科学—植物保护] S451.1