Simulation Study On Mechanism Of Three Soil Conditioners Improve Heavy Soda-Saline Soil

This paper based on the method of monolith lysimeter leaching experiment to improve Heavy Soda-Saline Soil by simulating field in outdoor. Effects of DS-1997,dusulphurization gypsum and ferrous sulfate on soil pH,EC, water soluble ions, exchangeable sodium,ESP, organic matter,total nitrogen,available phosphorus,available K, bulk density and saturated hydraulic conductivity.The results showed that:(1)DS-1997 can reduce soil pH,20-40cm soil EC and improve 0-10cm soil EC.It can improve SO42- content in 0-20cm soil, improve CO32- and Na+content in 20-40cm soil.Other water soluble ions were reduced.It can reduce exchangeable sodium content and ESP in 0-30cm soil and improve exchangeable sodium content and ESP in 30-40cm soil.It can improve organic matter,total nitrogen,available phosphorus,available K content,saturated hydraulic conductivity and reduce bulk density.(2) Desulphurization gypsum can reduce soil pH and improve 0-10cm soil EC.It can ruduce CO32- and HCO3- content in 0-10cm soil,reduce Ca2+,Mg2+ and CO32- content in 20-40cm soil.Other water soluble ions were improved.It can reduce exchangeable sodium content and ESP in 0-20cm soil and improve exchangeable sodium content and ESP in 20-40cm soil.It can improve organic matter,total nitrogen,available phosphorus content and saturated hydraulic conductivity and reduce available K content and bulk density.(3) Ferrous sulfate can reduce soil pH and improve soil EC.It can ruduce Ca2+,HCO3", Cl- and Na+content in 0-10cm soil,reduce HCO3-content in 10-20cm soil,reduce Ca2+,HCO3- and Cl-content in 20-30cm soil.reduce HCO3-and Na+content in 30-40cm soil.Other water soluble ions were improved.It can reduce exchangeable sodium content and ESP in 0-20cm soil and improve exchangeable sodium content and ESP in 20-40cm soil.It can improve organic matter,total nitrogen,available phosphorus content,saturated hydraulic conductivity and available K content in 20-40cm soil and reduce available K content in 0-20cm soil and bulk density.