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The weeds can get some or extract the nutrients that should be in the crops. :)
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Weeds act as competition for the same space and nutrients that crops need to grow. If and when weeds are allowed to grow in the field, the farmer will more often than not get lower grain yeilds. In crops where the seed is harvested and sold as a cash crop, this is a serious threat. In crops where the plants are to be chopped up into silage, this is not as big as a threat because the silage is going to be eaten by livestock anyway.
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