The differential influence of certain vegetative covers on deep subsoil moisture
1936
Myers, H.E.
Sweet clover grown continuously on soil for two seasons under the condition of this experiment has reduced the subsoil moisture in certain instances to a maximum depth of 14 feet. The data indicate that a reduction approaching the minimum point of exhaustion has extended into the thirteenth foot section. One year's growth of sweet clover in certain cases has reduced the moisture to near the minimum point of exhaustion to a maximum depth of 9 feet. Soybeans growing for one season have not resulted in the development of a dry layer below the sixth foot in any plat included in this study. The depth of the moisture reduction by alfalfa and sweet clover has been governed largely by the rainfall during the period when the legume occupied the soil. The growth of sweet clover for either 1 or 2 years under limited rainfall conditions may result in the development of a dry layer of depth sufficient to prevent the utilization of moisture at a lower level by subsequent alfalfa crops.
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