How Crops Grow a Treatise On the Chemical Composition Structure And Life of Th
How Crops Grow a Treatise On the Chemical Composition Structure And Life of Th
Samuel W Samuel William Johnson
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151. ) The formation of air-roots may be very easily observed by placing water to the depth of half an inch in a tall VEGETATIVE OBGAtfS OF PLANTS. vial, inserting a sprig of the common greenhouse-plant Tradescantia zebrina, so that the cut end of the stem shall stand in the water, and finally corking the vial air- tight. The plant, which is very tenacious of life, and usually grows well in spite of all neglect, is not checked in its vegetative development by the treatment just de- scribed, but... immediately begins to adapt itself to its new circumstances. In a few days, if the temperature be 70 or thereabout, air -roots will be seen to issue from the joints of the stem. These are fringed with a profu- sion of delicate hairs, and rapidly extend to a length of from one to two inches. The lower ones, if they chance Fig. 44. to penetrate the water, become discolored and decay ; th& others, however, remain for a long time fresh, and of a white color. Some plants have roots which are equally able to exist and perform their functions, whether in the soil or sub- 276 HOW CROPS GROW.
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