Abstract
Computer programs written in BASICA (IBM'S VERSION OF BASIC) language were developed for the calculation of the gas exchange parameters of CO2 assimilation, leaf conductance, stomatal conductance, residual conductance, intercellular CO2 concentration, transpiration, water use efficiency and transpiration ratio in an open system. Formulas are discussed in both an algebraic and in a BASIC computer program form. Calculations based on mole fractions of CO2 and water vapor are explained and both molar and mass fluxes are included in the program output to facilitate comparisons with data from the literature. Corrections are made in the program to account for under-estimation of CO2 assimilation due to the increase in flow rates out of sample chambers caused by simultaneous transpiration. A sample output is included to illustrate the formatting capability of the program.
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