Dry wine grapes do best in the counties around San Francisco Bay, on unirrigated lands; while sweet wine stocks do best in Yolo, San Joaquin and the counties of the raisin grape, and on irrigated lands.
Millet crops are grown for the most part on unirrigated land.
Other pulses, lentils, &c., are extensively grown, but the area under these crops is liable to great contraction in years of drought, as it consists for the most part of unirrigated lands.
The completion of the Assuan dam by ensuring a fuller supply of water enabled 20,000 acres of land, previously unirrigated and untaxed, to be brought under cultivation in the three years 1903-1905.
Unirrigated land laid under wheat by the natives is said to yield twelve bushels an acre.