干旱区生态环境知识资源中心

Soil salinity and alkalinity problem in arid and semi-arid area is one of the main obstacles of developing and achieving to sustainable agriculture. Leaching solutes from soil profile are among those important measurements to control soil saturated extract solutes particulary in salt and sodiumated lands. A research plan in completely random block formats with five leaching treatments : pre-leaching, applying 25, 50, 75 and 100 cm water to leaching in two repetitions was performed in order to improve salt and sodiumated soils in parts of Mollasani arable lands. First, five plots of 16 square metres dimensions were supplied based on test plan and treatment pertinent to leaching and after achieving humidity to farm caring capacity soil sample was provided to analyze solute level changing involved in soil. Soil testing results from pre-leaching and post-leaching represent that pre-testing soil class was S(4)A(4) and was changed to S(1)A(2) class after applying 1 metre leaching water. Exactly changing water level required for leaching of each soil depth is possible through de-salinating and de-sodiumating curves provided. Average electrical conductivity (EC), exchangble sodium percentage (ESP), acidity average (PH) in soil 60 cm depth pre-leaching were changed 66.77(dS/m), 63.61%, respectively and post-leaching was changed 7.4 (dS/m), 21.9% and 7.78, respectively. The research results showed that there was no need to utilize improving material to improve and optimize these soils with respect to exchangeable sodium percentage (ESP) procedure and soluble bivalent solutes in both water and soil.