Not available – first paragraph follows: Over 2.5 million acres of California farmland have some form of water penetration problem during the irrigation season, according to a recent survey by Cooperative Extension farm advisors. In some cases, simply increasing the length or frequency of irrigation may alleviate the problem and provide sufficient water to the crop. In other cases, the problem is more serious: crop yields are reduced and health and vigor of trees and vines are adversely affected, even with careful water management.

Partial eupport for this work came from the Prune and Walnul Advisory Boords.