The Nature of Drought According to the Evidence of the Odessa Experiment Field
The Nature of Drought According to the Evidence of the Odessa Experiment Field
Vl G Rotmistrov
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Perennials like green fodder, shrubs and trees extend their roots several fathoms deep, sometimes over 10; green fodder, like lucerne, send their central root down to 8 even 10 fathoms; laterally the side roots do not extend beyond 60 or 80 cm. The side roots of trees extend from the central one to 5 or 6 fathoms, the white acacia (Robinia pseu- dacacia) even to ten fathoms. These morphological properties of the roots of our field plants must be kept in view in order to understand the role play...ed by them in the distribution of water; for the principal, almost the only factor in that distribution, is the root-system (as regards soil layers deeper than 50 cm. At any rate). The denser the root network of a plant, the easier it will be for that plant to find water of course. But plants with a weakly deve- loped root-system, like flax and cress, must have at their disposal a plentiful supply of water. This apparently explaius the preponderating culture and independent growth of grasses on dry steppe areas, for their denser root network can abtain the requisite quantity of water with gre- ater facility.
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