. The life of the plant. Plant physiology. THE STEM 169 But such exudation of water in the form of drops is a comparatively rare case. It generally happens under the conditions just described, when the surrounding air is saturated with water vapour ; but, as a rule, plants give off water in great quantities in the form of invisible vapour. We can realise the amount of water evaporated by plants from the following approximate calculations: one. Fig. 47. acre of oats evaporates during the summer from 150 to 250 tons of water ; an acre of mixed meadow grass something like 750 tons. We can de
. The life of the plant. Plant physiology. THE STEM 169 But such exudation of water in the form of drops is a comparatively rare case. It generally happens under the conditions just described, when the surrounding air is saturated with water vapour ; but, as a rule, plants give off water in great quantities in the form of invisible vapour. We can realise the amount of water evaporated by plants from the following approximate calculations: one. Fig. 47. acre of oats evaporates during the summer from 150 to 250 tons of water ; an acre of mixed meadow grass something like 750 tons. We can determine this amount of evaporated water in many ways. Here is one of the simplest and most exact methods. The pot in which a plant is growing is placed in a glass or tin vessel and covered with a glass or tin plate with a hole through it for the stem (fig. 47). In this way evaporation from the surface of the soil and the pot is prevented, and if we weigh the whole apparatus from time to time we know. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Timiri?a?zev, K. A. (Kliment Arkad?evich), 1843-1920; Sheremeteva, Anna, tr. London, New York, Bombay, Calcutta, Longmans, Green, and Co.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplantph, bookyear1912
