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Agricultural Salinity Assessment and Management by Edited by Wesley W. Wallender, Kenneth K. Tanji, Sc.D.

By Edited by Wesley W. Wallender, Kenneth K. Tanji, Sc.D.

Agricultural Salinity overview and administration, moment variation, considers world wide salinity and hint aspect administration in irrigated agriculture and water provides. This up to date variation offers a connection with support maintain irrigated agriculture and integrates modern strategies and administration practices. It covers technical and clinical elements of agricultural salinity mangement, in addition to environmental, fiscal, and criminal matters. subject matters contain: nature and quantity of agricultural salinity; prognosis of salinity difficulties and choice of keep watch over practices; soil reaction to saline and sodic stipulations; plant responses to saline and sodic stipulations; long term regional-scale modeling of soil salinity; case examine of San Joaquin Valley, California; institutional and salinity concerns at the top Rio Grande; and viability of irrigated agriculture with increasing house and time. the second one variation of MOP seventy one is efficacious to water pros, engineers, scientists, practitioners, and educators attracted to constructing and handling ever extra restricted water provides world wide

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3% of 4 AGRICULTURAL SALINITY ASSESSMENT AND MANAGEMENT FIGURE 1-1. Global water balance and fluxes. From Todd (1970). 001% (Todd 1970). 2% of the water associated with land is found in ice caps and glaciers and about 22% in groundwaters, much of which is economically irretrievable. This leaves only a small percentage of readily manageable fresh water as a resource for water supply. 5 ϫ 109 ha of which are cultivated (Massoud 1981). 56 ϫ 109 ha (37%) are sodic. Figure 1-2 shows that saline and sodic soils cover about 10% of total arable lands and exist in more than 100 countries.

1999d). “Drainage water treatment,” Technical Committee Report. SJVDIP. (1999e). “Land retirement,” Technical Committee Report. SJVDIP. (1999f). “Evaporation ponds,” Technical Committee Report. SJVDIP. (1999g). “Source reduction,” Technical Committee Report. SJVDIP. (1999h). “Groundwater management,” Technical Committee Report. SJVDIP. (1999i). “River discharge,” Technical Committee Report. SJVDIP. (1999j), “Salt utilization,” Technical Committee Report. SJVDIP. (1999k). “Grasslands subarea report,” Technical Committee Report.

During the 1960s, more and more attention was paid to nitrates. In the 1970s and the early part of the 1980s, NATURE AND EXTENT OF AGRICULTURAL SALINITY AND SODICITY 15 pesticides became the major problem. Now, selenium and other toxic elements are of major concern. Eugene Hilgard first identified the growing problem of drainage and alkaline soils in the San Joaquin Valley around 1877. He concluded in 1889 that subsurface drainage was needed for waterlogged, saline, and sodic soils (Kelley 1951).

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