|Author:||Shani, U. ; Ben-Gal, A. ; Dudley, L. M.|
|Book Group Author:||NA|
Analytical solutions of plant response to salinity and moisture content are simple, rigorous, general, and widely applicable to many situations and cases. Current treatment of yield and water uptake responses as a function of salinity is based solely on plant specific properties and ignores soil and climate. A new analytical solution is proposed that considers the interactions between the relevant climate, soil, water and plant response variables and their combined effect on plant and on environment. This solution was found to successfully predict water use and yield of crops under a variety of soils, climate conditions, input irrigation water levels and irrigation water quality. Plant response to salinity is shown to be dependent on soil hydraulic properties and on climate demand and cannot simply be regarded as plant specific. The solution shows that decreases in yield and transpiration due to salinity of irrigation water, are more severe in heavier than lighter soils. With severe water deficit, it shows that salinity does not further decrease water uptake. A main conclusion is that while some compensation of negative salinity effects can be made by increasing irrigation water quantities, high levels of saline water cannot bring yields up to those of lower salinity water.
|Pages:||411 - 416|
|Journal:||International salinity forum - managing saline soils andwater: science, technology and social issues. Oral PresentationAbstracts, Riverside Convention Center, Riverside, California, USA,25-28 April 2005|
climatic factors, crop yield, hydraulic potential,irrigation water, mathematical models, plant water relations, salinewater, salt tolerance, soil salinity, soil water content, transpiration,water deficit, water quality, water uptake, water use efficiency, saltwater, water composition and quality, Soil Fertility (JJ600), Pollutionand Degradation (PP600), Plant Water Relations (FF062), Soil WaterManagement (Irrigation and Drainage) (JJ800) (Revised June 2002)[formerly Soil Water Management], Mathematics and Statistics (ZZ100),Soil Physics (JJ300), Environmental Tolerance of Plants (FF900)