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Excerpt from Control of Salinity in the Imperial Valley, California Ground waters generally contain more salt than irrigation waters. When the ground-water level is close to the surface, a good deal of the salty ground water moves upward as a result of evaporation and plant use. This increases the salt content of the surface soil and may decrease crop growth. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.