The studies of the Utah Station on the effect of water on the yields of crops have shown, first, that as the water applied increases, the total weight of dry matter also increases; and second, that the increase is not in proportion to the amount of water applied, since the less water applied, the larger the yield of dry matter for each inch of water used. These experiments, as reported in bulletins No. 116 and No. 117 indicate with much certainty the best quantities of water to use for various crops. When, however, each farmer has been allotted this best quantity, the question still remains as to the best way in which to use it on a definite area of land. The question brings into prominence several factors, recognized by the farmer, but concerning which very little definite data exist.
Widtsoe, John A. and Merrill, L. A., "Bulletin No. 118 - Methods for Increasing the Crop Producing Power of Irrigation Water" (1912). UAES Bulletins. Paper 69.