Leaching requirements to prevent soil salinization.

Book Title: NA
Year Published: 2006
Month Published: NA
Author: Kara, T. ; Willardson, L. S.
Book Group Author: NA
Abstract:

The purpose of this study was to develop a model to quantify the rate of upward water movement from a shallow water table for different soils with and without plants as a function of water table depth and time, to predict Electrical Conductivity (EC) of the soil in a one-dimensional homogenous soil profile and to develop a water management procedure to control soil profile salinity in the presence of a shallow water table. The model simulates water and solute movement from a shallow water table for a bare soil surface. Salt distribution in the soil profile, caused by a saline shallow water table, was simulated by assuming a steady state upward water movement in the absence of a crop. As water moves upward through a soil profile from a shallow water table, the water evaporates at the surface, leaving the salt behind. Some of the salt moves down to a depth approximately 30 cm by molecular diffusion. This raises the salt concentration within the top 30 cm of the soil. The model also simulates crop water extraction patterns and consequently the salt distribution patterns in an irrigated soil profile for a specified root distribution. After a fallow season and the resulting salt concentration near the soil surface, the salt redistributes downward because of irrigation water application. Different leaching fractions were used in the simulations. A computer program, for the model SALTCTRL (Salt Control), was written in QBASIC language. The program was tested for two soils for different leaching fractions. The soil parameters needed for the computations were selected from the literature. Application of model results is discussed and recommendations for further research were made.

Pages: 1481 - 1489
URL: http://0-search.ebscohost.com.catalog.library.colostate.edu/login.aspx?direct=true&AuthType=cookie,ip,url,cpid&custid=s4640792&db=lah&AN=20073073930&site=ehost-live
Volume: 6
Number: 7
Journal: Journal of Applied Sciences
Journal ISO: NA
Organization: NA
Publisher: NA
ISBN: NA
ISSN: 1812-5654
DOI: NA
Keywords:

computer software, electrical conductivity, irrigated soils,irrigation, leaching, salinization, simulation models, soil profiles,soil types, soil water movement, water table, computer programs,watering, Information and Documentation (CC300), Soil Chemistry andMineralogy (JJ200), Soil Physics (JJ300), Soil Water Management(Irrigation and Drainage) (JJ800) (Revised June 2002) [formerly SoilWater Management], Mathematics and Statistics (ZZ100)

Source: EBSCO
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