Simulations suggest optimum weed population levels (thresholds) for maintaining genotypes that are susceptible to control practices and which minimize crop yield reductions. Determining ets or action thresholds of weeds involves methods that can measure and predict the level of weed infestation. We conclude that the economic underpinning of the threshold concept is deceptive and does not provide a base for rational use of weed control in the long term. Critical period of weed control is a threshold commonly used, which is relative to time from planting date Researchers have identified at what point during the growing season weeds can inflict the most damage on a crop’s potential yield.
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