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With these tools, scientists have quantified some risks of management and the value of information about the weed population in a field for management decisions or the value of specific information about weed biology for identifying new management strategies. The economic threshold model accounts for changing economic conditions, the effect of weeds on crop quality, the effect of multiple weed species on yield and quality, and uncertainty about spraying period length. Research at north carolina state university has been successful in developing multispecies economic thresholds for weeds in soybeans
The approach used in this researchwas to establish an index for comparing the competitive ability of the different weed species infesting the crop. The opportunity losses in yield and quality are functions of weed numbers, and the loss per weed in each case (y1w and q1w) will replace the value of the yield loss per weed (lwp) and enter the model additively as in (5). Determination of interference periods, competitive ability and economic threshold level (etl) are important tools for integrated weed management (iwm) in barley.
Competitive and economic thresholds are distinctive and important concepts to weed scientists
The producer is most concerned about the economic threshold because of its importance in production decisions.
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