. Principles of plant culture; an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. The Water of Plants and Its Movements. 59 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 in- fluence of trees upon adjacent crops in dry weather (Fig. 26). Transpiration is much more rapid during. I'iG. 26 Showing how a spruce hedge dwarfs an adjacent corn crop m dry weather. dry than during wet weather, and in the rare atmos- p
. Principles of plant culture; an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. The Water of Plants and Its Movements. 59 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 in- fluence of trees upon adjacent crops in dry weather (Fig. 26). Transpiration is much more rapid during. I'iG. 26 Showing how a spruce hedge dwarfs an adjacent corn crop m dry weather. dry than during wet weather, and in the rare atmos- phere of high altitudes than in the denser atmosphere of low lands. Excessive transpiration, as occurs in very dry weather, is detrimental to plants, since it reduces the water pressure within the cells below the point where healthful growth can take place (62) ; but normal transpiration, i. e., not sufficient in amount to interfere with healthful growth, is doubtless beneficial, since it aids in carrying food materials from the soil into the leaves (58). For this reason, plants native to regions having a rather dry atmosphere, do not thrive in green houses unless abundant ventilation is given to encour- age transpiration. 75. Trees are Detrimental to Crops in their vicinity not only by the shade they cause, but also by their ex- hausting effect upon the soil moisture in dry 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. University Co-operative Co.
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