Studying Different Type of Leaching Models in Two Pilots Located at South East of Khoozestan Province

In dry areas, such as IRAN, where have low precipitation and high evaporation, salt accumulation on soil surface is unavoidable. Therefore it is necessary to use an applicable method to estimate the water requirement for agricultural soil improvement. This study aims to draw desalinization and dealkalization curves and apply the best type of empirical leaching models for leaching salt and sodium of south east Khoozestan province. This study has conducted in two areas of Khuzestan state. For this propose, two experimental areas were selected and four treatments with three replications, were designed. The treatments were included 25cm, 50cm, 75cm and 100cm water application. In addition of above treatments, in second area about mentioned treatments were repeated by amendment matter (Sulfuric acid). Eleven empirical models were compared using initial and final values of EC and Na. the results showed that manner model was the best model with 83 and 85 percent coefficient correlation in pilot No.1. Meanwhile, in pilot No.2 the cubic model was the best model with 94 and 88 percent coefficient correlation. In this pilot when it was used acid, the exponential growth, logistic, compound and inverse models with 88% coefficient correlation, had shown maximum correlation.