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发表于 2017-2-7 12:34
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A number of the grass selective herbicide products are not herbicidal when stored in their original container. This is because they are manufactured as 'proherbicides' that change into the active chemical form once inside the weed.
An example of proherbicides are grass selective herbicides containing diclofop-methyl. Diclofop-methyl is a proherbicide, not a herbicide. Once it is applied and absorbed by the leaves of the weed, an enzyme in the plant cells removes the methyl group from the diclofop, and the diclofop then kills the weed by inhibiting the production of an enzyme that assists fatty acid synthesis.
Fatty acids are an integral part of cell membranes, waxes and the leaf cuticle. When fatty acid production stops, the weed dies because it cannot continue to carry on the basic biological processes essential for life.
So why don't selective herbicides kill the useful plants we are trying to grow? The main reason is because the useful plants are able to metabolise (break down) the herbicide more rapidly than the weeds, allowing them to survive. In other cases such as 2,4-DB, some useful plants are unable to break it down into the active form of 2,4-D, thus they survive while weeds that can break down to 2,4-D do not.
Google出来的，看起来问题不大，如果菜死掉，说明它吸收除草剂，没死的话菜就把有机氯除草剂分解掉了。 |
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交作业了：MEL 4个月购房成功。经验，教训 分享。。。。 (2009-7-28) lin515228 
