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Title 190 — National Foresty Handbook <br />• Flag these competing trees with flagging of a different color; they are the <br />"cut trees" that will be cut or killed to release the crowns of crop trees. <br />Trees that do not contact a crop tree crown, or that are growing below a <br />crop tree crown, are disregarded since they do not compete with crop <br />trees. <br />• Identify and flag competing trees on at least three out of four quadrats <br />around the crop tree (fig. 10). <br />o Determine whether the landowners are satisfied with the amount of cutting. If less <br />cutting is desired, first reduce the number of crop trees and then reduce the cut trees <br />associated with those crop trees. This ensures that all remaining crop trees are fully <br />released. <br />o Utilize information from the reconnaissance survey to calculate the number and <br />average diameter of crop trees and cut trees, and the residual BA of the stand. <br />o The average number of crop trees and cut trees per acre, and the average diameter of <br />these trees, will help the landowners or forestry contractor determine the potential for <br />a timber sale and estimate the workload to cut or kill competing trees. In typical <br />cases, 20-75 crop trees will be released per acre (4-15 crop trees per 1/5-acre plot). <br />o The calculation of residual BA will ensure that the stand remains fully stocked after <br />crop tree management. See Perkey et al. (1994) for more information on crop tree <br />management. <br />Figure 10: The crop tree crown in the center of this illustration has been separated into four <br />quardrants. A free -to -grow rating is determined by evaluating each side for competition from <br />neighboring crowns. This crop tree is free to grow on three sides (Wilkens 1994). <br />(Technical Note No. 190-FOR-01, Jul 2018) <br />21 <br />