疣草化学防除效果及其与水稻产量的关系

在盆栽试验的基础上,研究了10种除草剂对疣草的防除效果,分析了防除效果与水稻产量的关系。结果表明,插秧前用药50%马歇特效果最好,株防效达90%;53%赛龙、50%马歇特和30%稻草克鲜重防效均在90%以上。插秧后用药,1%韩乐天防鲜重效果达95%以上。53%赛龙、1%韩乐天、50%马歇特产量最高,比CK分别增产74.41%、58.27%、57.51%。有效穗数对水稻产量的直接通径系数最大,为0.716638,株防效、鲜重防效和分蘖数通过有效穗数对水稻产量的间接通径系数均较大,分别为0.525439、0.583343和0.667333。

The Relation of the Chemical Control Ratio on Murdannja keisak and Paddy Output

On the basis of basin-planting experiment, the tests have contrasted the control ratio of 10 kinds weed killer to Murdannja keisak, and have analysed the relation of control ratio and paddy output. Show as a result: using 50%Machete before transplanting rice seedlings is best, and the control ratio with quantity of weed reaches 90%. And the control ratio with weigh of weed all reach 90% more by using 53%Mefenacet Bensulfuron, 50%Machete and 30% Butachlor Oxadiazon.The control ratio with weigh of weed by using 1%Pyanchor after transplanting rice seedlings reaches 95% more. 53%Mefenacet Bensulfuron , 1%Pyanchor and 50%Machete had the best output. They respectively increase production 74.41%, 58.27% and 57.51% than CK. The direct Path coefficient of effective fringe quantity to paddy output is the biggest. It is 0.716638. The indirect Path coefficient of the control ratio with quantity of weed , the control ratio with weigh of weed and tillered quantity by effective fringe quantity to paddy output are bigger. They are 0.525439, 0.583343 and 0.667333.