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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: PKRBKR who wrote (852043)	4/24/2015 3:00:24 PM
From: one_less	Respond to of 1577379

Agricultural Lands have been turned into deserts throughout history. Salt Crusts form in irrigated land that is heavily salinized. The crusts, however tend to be thin and occur in generally circular spots a few or several meters across. Crusts in furrow-irrigated fields frequently occur as whit strips on top of beds between the furrows. Furrow irrigation carries dissolved salts toward the center of the beds, where they are precipitated as the water evaporates, (Harold E Dregne) books.google.com California Salinity accumulation is another long-term groundwater quality challenge. Salt accumulation is particularly problematic on the Westside of the Tulare Lake and San Joaquin basins, which lack much ability to export salt from imported water or local soils – affecting about 500,000 acres of farmland (SJVDP 1990). In many other parts of California, such as the cities of Davis and Woodland, the accumulation of salts in groundwater is threatening the viability of urban groundwater water use, because of wastewater regulations regarding the consequently higher salinity in urban wastewater discharges. Statewide, major sources of salt are local soils and aquifers, irrigation water, animal farming, and municipal and industrial wastes – including salts from water softeners. Salts in irrigation water and wastewater applied to crops or urban landscapes are concentrated by evapotranspiration from plants, leaving salts behind. Salinity accumulation has a history of ending agriculture in arid regions (Hillel 2000). californiawaterblog.com