Study on salt distribution in soil column in Haloxylon planted lysimeters

Higher evaporation compared to precipitation in arid zones causes upward movement of soil water and consequently salts will be accumulated in root zone. Since Salt moves with water flow, salt distribution will fallow a pattern similar to soil water distribution. The amount of applied water or leaching fraction is one of the most important and effective factors on salt movement and distribution in soil. This research was established at Yazd Desert Research Station in weighting lysimeters. Salt profile in soils of three hrrhgation treatments: FC, 1/3 FC and no irrigation were plotted and compared with each others for three times (t1, t2 and t3) in this research. In addition soil moisture was also controlled in different ways. The experhment was done in a completely randomized design and Duncan's test was used for comparison of means. Results indicated that soil salinity increased from top soil to deeper layers and this feauture was more significant in fully irrigated treatments specially at the latest times (t2 and t3). Total accumulated salt was also more at more irrigated treatments. High salinity of water and inadequate of leaching, were the most important factors which led to salt accumulation in the deep layers of fully irrigated lysimeters.