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2. classification of herbicide based on the time of the application There are two types of herbicide based on the application of the herbicide pratumbuh (preemergence herbicide) and herbicide pascatumbuh (postemergence herbicide). The first is spread on land after being processed but before seeds are stocked (or as soon as the seeds are stocked). Usually these types of herbicides are nonselektif, which means to kill all of the existing plants. The second is given after the first seeds brings out the leaves. This type of herbicide should be selective, in the sense of not disturbing the plant anyway.
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