Adopting economic threshold weed control farming practices typically reduces herbicide costs while maintaining profitability Simulations suggest optimum weed population levels (thresholds) for maintaining genotypes that are susceptible to control practices and which minimize crop yield reductions. Even with herbicide rates adjusted to compensate for soil properties there is a weed density effect on herbicide activity, with herbicide efficacy (success) decreasing with increasing weed density The more weeds present, the greater the amount of herbicide required for the same level of activity. Determining ets or action thresholds of weeds involves methods that can measure and predict the level of weed infestation. On the other hand, any increase in crop yield, value, degree of weed control, or crop loss per unit weed density will lower economic thresholds, other factors being constant.
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