Date of Award:
Master of Science (MS)
Plants, Soils, and Climate
J. E. Greaves
Plants require ten elements in appreciable quantity and several others in smaller amount for their continued and normal growth. Three of these necessary elements, nitrogen, phosphorus, and potassium are most important because they occur in the soil in quantities which are usually small in proportion to that needed by the plants. Of these three, nitrogen is in most cases the limiting factor because of the ease with which in may be leached from the soil and comparatively large amount assimilated by plants. These factors coupled with the inhibiting high cost of artificially replacing it in the form of commercial fertilizers, make its conservation and efficient utilization of the utmost importance.
Johnson, Richard B., "The Isolation of Some Nonsymbiotic Nitrogen Fixing Organisms Occurring in Some Utah Soils" (1941). All Graduate Theses and Dissertations. 1794.
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