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除草剂为什么专除杂草不伤苗,原因是利用了作物和杂草间的差异。 1.生理上的差异。不同的植物,对不同的除草剂有不同的生理反应,对除障剂的敏感性就不一样。例如当水稻秧苗在“立针现青、稗草一叶一心”的时候,如果喷洒“敌稗”乳油消灭稗草时,由于水稻秧苗体内存在一种能分解敌稗的酶,敌稗喷到秧苗身上就没有杀伤作用,稗草呢,它却不能分解敌稗,就被敌稗杀死。在玉米地里喷洒西玛津除草剂,只杀死杂草而不伤害
Why weeding herbicide weeding does not hurt seedlings, the reason is the use of the differences between crops and weeds. 1. Physiological differences. Different plants have different physiological responses to different herbicides, but different sensitivities to defibrillators. For example, when the rice seedling is in the condition of “standing green and barnyardgrass leaves one heart and one heart”, if the barnyard grass is sprayed with “propanil” EC, there is an enzyme that can decompose propanil in the rice seedling, Seedlings have no lethal effect, barnyard grass, but it can not break down propanil, it was killed by enemy barnyardgrass. Simazine herbicide is sprayed in the cornfield to kill only weeds without harming it