晚稻免耕灭茬除草农药筛选试验研究

[目的]正确选用高效、低毒、耐雨性强的免耕灭茬除草剂及施用方法。[方法]以晚稻组合T优207为试材,设施用20%克无踪(3.0、4.56、.0 kg/hm2)、10%草甘膦(15.02、2.5 kg/hm2)及喷清水对照6个处理,3次重复,对灭茬除草剂及其用量进行筛选试验。[结果]20%克无踪和10%草甘膦能有效地灭除早稻桩,但施用量不宜太大,分别为3.0和15.0 kg/hm2,对水450 kg/hm2,其灭茬效果在98%以上,并且水稻产量比对照增产2%~8%,但增加施药量时,这2种药剂处理的水稻产量均下降。[结论]20%克无踪和10%草甘膦只有在合理施用量下可同时获得高效灭茬效果和增产效果,但免耕灭茬除草剂不能代替大田除草剂。

The Experimental Study on Screening No-tillage Stubbing Herbicides in Late Rice

[Objective] The study aimed to select the no-tillage stubbing herbicides with high effectivity,low toxin and strong rain-resistance and their applying methods correctly.[Method] With late rice combination TYou 207 as tested material,6 treatments of applying 20% Gramoxone at 3.0,4.5 and 6.0 kg/hm2,10% Glyphosate at 15.0 and 22.5 kg/hm2,and spraying clean water(CK) with 3 repeats were set up to make the experiment on screening stubbing herbicides and their rational dosage.[Result] 20% Gramoxone and 10% Glyphosate could effectively remove the early rice stub,but their dosage didn't be too big.When they were applied on the late rice field at 3.0 and 15.0 kg/hm2 resp.and with water addition of 450 kg/hm2 they could get the stubbing effect of over 98% and increase the rice yield by 2%～8% than CK.[Conclusion] 20% Gramoxone and 10% Glyphosate could get high-effective stubbing effect and yield increase effect simultaneously only under applying their rational dosage.But the no-tillage stubbing herbicide couldn't replace the field herbicide.