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Note: All varieties of Prunus will thrive in alkali soils if grafted on Prunus davidiana. E. Drought-resisting Plants. The ability of some plants toresist drought lies not in their ability to extract more water than otherplants from the same soil, as commonly supposed, but in their abilityto send deep roots after water, or else to cut down the loss of moisturethrough their tops when soil moisture is scarce. All plants requireabout the same amount of available moisture in the soil around theirroots, to keep them from wilting when growing in the same type of soil.But soil types vary in their ability to give up moisture, and themoisture content in a sandy soil can fall much lower than in a moreretentive loam or clay soil before plants begin to wilt. This explainswhy plants adapted to drought conditions and growing in a sandy soilcan survive a period of drought which will seriously injure other plantsgrowing near by upon a clay loam soil actually containing more water. |
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