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ECONOMIC MODEL FOR PROGRAM EVALUATION v
RESULTS AND DISCUSSION
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11 FORMAT acre of plantation acre of seed analysis benefit-cost ratio Caribbean pine commercial seed production costs per acre CURRENT STUMPAGE PRICE Douglas fir Effect of varying END IF WRITE ENTER COST ENTER NUMBER evaluation final harvest gain for white genetic gain necessary genetic gain percent Herbicide improved plantations intermediate thinnings jack pine program loblolly pine necessary to break-even Nicolet National Forest number of acres percent genetic gain percent interest rate pine tree improvement Porterfield present cost PRESENT VALUE COST PROGENY TESTING rate of return READ 5t real price increase red pine program representative jack pine representative red pine representative white spruce required genetic gain required yield ft required yield required RESP EQ RESP IF RESP rotation age seed production begins seed yields SUBROUTINE total net present TPVC tree improvement programs U.S. Forest Service USDA VCYCLE EQ white spruce program WRITE St yield ft acre yield required genetic