Abstract
Soil and plant technicians, ranchers and farmers have long recognized the fact that soil differences are often accompanied by certain plant differences. Scientists have studied and written about precise soil-plant relationships. H. L. Shantz (1911, 1938) and A. W. Sampson (1939) contributed much to the understanding of plants and the soils on which they grow over a wide area, and to the application of these facts to western agriculture. In studying soil-plant relationships, a phase of a soil type is the unit of soil mapping about which the greater number of precise statements and predictions can be made concerning soil use, management and productivity. Locally, and on arable lands, these specific soilplant relationships are well known and recognized. On non-arable lands, the concepts of soil-plant relationships are often general in nature; as, for example, that saltgrass occurs on saline soils and conifers on acid soils. This is due to the longer and more detailed background of research and observation on cultivated lands than on range and forest lands.
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