In earlier bulletins it has been shown that when the quantity of irrigation water applied to crops is varied, the yields of the total crop as well as of the several plant parts vary quite definitely. The readiness with which plants respond to differences in irrigation is really remarkable and undoubtedly lies at the foundation of the future science of irrigation.
Variations in the quantities of irrigation water not only affect the total yield of dry matter, but also the composition of the plant itself. This fact was brought out many years ago in the investigations of this Station.
Widtsoe, John A. and Stewart, Robert, "Bulletin No. 120 - The Chemical Composition of Crops as Affected by Different Quantities of Irrigation Water" (1912). UAES Bulletins. Paper 71.