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As stated in Bulletin No. 143 the matter contained there and in the following pages grew out of seepage conditions on the Southern Utah Experiment Farm, which necessitated the removal of a five acre vineyard in 1908 and of a seven acre orchard in 1910. The general soil conditions were there briefly indicated and the extent and physical conditions of the root systems discussed. In this bulletin is shown the effect of rainfall and irrigation water on the soil in relation especially to its free water content at various seasons and how this varies. A brief discussion of the fluctuations shown and of their effect on the soil and vegetation is also included; this, with the conditions of the farm especially in mind.



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