Study On Improvement Of Heavily Saline Soil In Daqing

Saline-alkali soil is one of wide distributing soils,the area of which is about 25%of the whole land area all over the world.At present,how to amend and use saline-alkali soil was becoming a focus of researches.In the study,an Orthogonal Design with there 3 levels, including 8 treatments,was taken to test effects of treatments of different amendments,gypsum, fly ash and furfural residues,on physical and chemical properties of saline-sodic soil in Daqing of the Songnen Plain.The results indicated that the physical and chemical properties of the saline-alkali soil were improved.Soil bulk density was reduced,and osmosis speed was promoted,pH and contents of Na⁺,Cl^-,HCO₃^- were reduced,while the contents of SO₄^2-,Ca²⁺,Mg²⁺ were increased,because of the application of amendments,gypsum,fly ash and furfural residues in the saline-alkali soil.1.Eight kinds of treatments can improve soil physical properties.Soil bulk density decreased, soil porosity,permeability coefficient and field capacity increased under the treatments. Amendment c is the best,and i is the second.2.It has the best effect on soil physicl character,with its compose by fly ash 20kg·m^-2 and furfural residues 3kg·m^-2.Contrast to the comparison,soil bulk density decreased by 0.25g·cm^-3,soil porosity increased by 7.53%,permeability coefficient increased by 7.92%,field capacity increased by 0.22mm/min.3.Eight kinds of treatments are able to increase the content of soil nutrient..Available N,P,K increased,soil pH reduced.The four amendments can cut down the content of dissolving salt in soil.In the whole dissolving ion component by measuring,the content o HCO₃^-,Na⁺,Cl^- and Mg²⁺ decreased,the content of SO₄^2- and Ca²⁺ went up with increasing of using amount.4.It has the best effect on soil chemical character,with its compose by gypsum 3kg·m^-2,fly ash 20kg·m^-2 and furfural residues 1.5kg·m^-2.Contrast to the comparison,effectual- phosphorus increased by 18.51 mg/kg,the soil pH decreased by 0.89,hydrolyte-salt was reduced 0.054%,the content of Na⁺ reduced by 0.44 mg per 100g soil.5.Eight kinds of soil treatments can improve the grass growth degree.treatments i with its compose by gypsum 3kg·m^-2,fly ash 20kg·m^-2 and furfural residues 1.5kg·m^-2 can remarkably increase grass biomass,and treatments g with its compose by gypsum 3kg.m^-2and furfural residues 3kg·m^-2 followed.The resualts of two amendments have no obviousest different.