不同化学除莠剂的除莠效应试验研究

Study about the Effect of Different Herbicides

依据成都地区以草地早熟禾为主体的草坪杂草的季节生长发育节律,测定了它们在不同地段的种类、结构、数量、季节更替及其危害。选用了神锄、甲醛(浓度5％)、2,4-D(浓度为0.7％、0.8％、1.0％、1.2％、1,4％)、2,4.D丁酯与使它隆按一定比例配合混施和单施,对草坪为双子叶杂草进行化学除莠。试验获知,甲醛灭效为92.82％;2,4-D浓度为0.8％时灭效为84.45％,浓度为1.0％时灭效为87.37％,1.2％时灭效为91.54％,1.4％时灭效为93.24％;使它隆、2,4-D丁酯混施灭效欠佳,平均为46.98％,使它隆单施灭效为87.83％,2,4-D丁酯单施灭效为83.85％,神锄灭效最差,平均为31.92％。

In this study, we measured the type, structure, number, seasonal alternation and harm of weed in the turfs major in Poa in Chengdu. Meanwhile we compared the effects of several chemicals on the dicotyledon in turf, including quincloric, formaldehyde, 2, 4-D and their combination with starane. We found that formaldehyde was the best with eliminable rate of 92.82%. The eliminable rate of 2, 4-D was 84.25%, 87.37%, 91.54%, 93.24%, respectively, when its density was 0.8%, 1.0%, 1.2%, 1.4%. The eliminable rate was only 46.98% when starane and 2, 4-D were combined. When only one herbicide was used, the eliminable rate of starane was 87.83%, and that of 2, 4-D was 83.85%. The eliminable rate of quincloric was only 31.92%.