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PEACH simulates the annual carbon supply and demand in peach trees. Calculations represent the amount of carbon produced in photosynthesis and the amount of carbon used for growth and respiration. The program simulates tree growth on a daily basis for one growing season.

Students may use PEACH to test their understanding of integrated plant growth. It models typical horticultural operations such as thinning and pruning.

Fruit, leaf, current-year stem, branch, trunk, and root weight are the state variables in PEACH. The minimum and maximum air and soil temperatures, degree-days, solar radiation, and canopy light interception are the driving variables.
The rate variables that characterize photosynthesis, maintenance respiration, and growth are derived from experimental studies on PEACH.