in the us, irrigation water application data are collected in the quinquennial farm and ranch irrigation survey, conducted as part of the census of agriculture. such data indicate great differences in irrigation water use within various agricultural sectors. for example, about 14 percent of corn-for-grain land and 11 percent of soybean land in the us are irrigated, compared with 66 percent of vegetable land, 79 percent of orchard land and 97 percent of rice land.