. The principles and practice of Pruning. PLANT PHYSIOLOGY AS RELATED TO PRUNING constant supply of water during its growing season, the soil, however rich in plant food, might as well be sterile. Succulent plants and plant tissues in active growth con- tain relatively little fiber, mineral and other solid material, but 75 per cent or more of water. Thick-walled, protective and woody tissues contain relatively less, as may also the succulent parts during periods of drouths. 8. Dual function of water.—Water acts in the double capacity of (1) a plant food solvent and transporting agen
. The principles and practice of Pruning. PLANT PHYSIOLOGY AS RELATED TO PRUNING constant supply of water during its growing season, the soil, however rich in plant food, might as well be sterile. Succulent plants and plant tissues in active growth con- tain relatively little fiber, mineral and other solid material, but 75 per cent or more of water. Thick-walled, protective and woody tissues contain relatively less, as may also the succulent parts during periods of drouths. 8. Dual function of water.—Water acts in the double capacity of (1) a plant food solvent and transporting agent, and (2) a crude plant inod itself, as in the manufacture of starches, sugars, cellulose, etc. Dur- ing the growing period, therefore, ordinary plants must be in constant touch with water in greater or lesser supply. Their forms, functions and development are also affected bv the chlorenchyma cell , ^ . ,. ^ ., ^. , , - . SHOWING STARCH volume, the distnl:)ution and the mm- grains and eral content of the available water. chloroplasts Water maintains rigidity in succulent plants and in those growing parts whose cells have not become firm enough to maintain their normal form when the supply of water becomes reduced. This function produces what is termed hydrostatic rigidity, since it enables succulent plants to support considerable weights of branches and other plant parts. Should the water supply become re- duced, such plants Vv'ould droop or "\^•ilt more or less seri- ously. Hence, ample water is a prime requisite of suc- cessful development. The supph' may be reduced by other means than simply lack of water in the soil. "Booth reports an instance in which peaches on Marianna plum stocks grew fairly well for two years, though from the start the ;;eaches grew more rapidly than the plums, so the peach trunks were at two years twice as large at the union as below. During the second season the weather was very hot and drj', and the peach trees,. Please note that the
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpruning, bookyear1922
