Transpiration Coefficient

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Transpiration Coefficient

 

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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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The study was based on the evaluation of different irrigation strategies in the cultivation of 'Prata-Ana' (AAB) and 'BRS Platina' (AAAB) bananas, during four production cycles in order to define, according to the criteria of yield and water use efficiency, a model for irrigation management based on leaf area, empirical transpiration coefficient (K) and on the crop coefficient.
Based on the results of these four production cycles, it was possible to determine the empirical transpiration coefficient that best fitted to the model for the estimation of water demand by 'Prata-Ana' and 'BRS-Platina' bananas, with data of leaf area and ETo.
1979) and Leaf Area Index (LAI) have been shown to be related to evaporation coefficients such as a crop coefficient (defined as the ratio of actual evaporation to reference crop evaporation) and a transpiration coefficient (defined as the ratio of unstressed evaporation and reference crop evaporation).