Transpiration Coefficient

0.01 sec.

the quantity of water (in grams) expended on the formation of 1 g of dry matter. The transpiration coefficient depends on climatic and soil conditions and on the species of plant (for example, in millets it is relatively low). The transpiration coefficients of various plants range from 200 to 1,000 or more. When the transpiration coefficient is known, it is possible to calculate approximately the irrigation norms for irrigated crops under various soil and climatic conditions. Knowledge of the coefficient increases the efficiency of various methods of irrigation. The transpiration coefficient decreases as conditions of feeding and moisture improve and as the fertility of the soil and the level of agricultural technique increase. The reciprocal of the transpiration coefficient is called the transpiration productivity.

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