. Principles of plant culture : an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. 56 Principles of Plant Culture. sedums, cacti etc., have special water-storing tissue, from wliich transpiration is extremely slow. Experiments indicate that the transpiration from most leaves is between one-third and one-sixth as much as the evaporation from an equal area of water. When we take into account the immense leaf surface of a large tree, it is evident that the aggregate transpiration must be very great, as is often illustrated by the dw
. Principles of plant culture : an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. 56 Principles of Plant Culture. sedums, cacti etc., have special water-storing tissue, from wliich transpiration is extremely slow. Experiments indicate that the transpiration from most leaves is between one-third and one-sixth as much as the evaporation from an equal area of water. When we take into account the immense leaf surface of a large tree, it is evident that the aggregate transpiration must be very great, as is often illustrated by the dwarfing influence of trees upon adjacent crops in dry weather. (Fig. 24). Transpira- tion is much more rapid during dry than during wet weather, and in the rare atmosphere of high altitudes than in the denser atmosphere of low lands. Excessive transpiration, as occurs in very drj- weather, is detrimental to plants, since it reduces the water pressure within the cells below the point where healthful growth can take place (63); but normal transpiration, i. e., in amount not sufficient to interfere with healthful growth, is doubt- less beneficial, since it aids in carrying food materials from the soil into the leaves, where they are needed for assimila- tion (59). For this reason, plants native to regions having a rather dry atmosphere, do not thrive in greenhouses unless abundant ventilation is given to encourage Fivj. 24. Showing how a spruce hedge dwarfs an adjacent corn crop in dry weather. Madison, 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 Goff, E. S. (Emmett Stull), 1852-1902. Madison, Wis. : E. S. Goff
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