Effects Of Rice Seeding And Different Modifier Combination On Fertilization And Improvement Of Soda Saline-alkali Soil

At present,soil salinization is one of the worldwide problems,which has an important impact on the degradation of land resources and ecological environment.However,soda saline-alkali soil,which is more harmful to plants,has a wide distribution area and great potential for arable land.Therefore,how to improve and utilize soda saline-alkali soil plays a key role in global agricultural production and sustainable development,so it is necessary to study the improvement and utilization of soda saline-alkali soil.Through field investigation and sampling,field design test and laboratory analysis,the effects of rice cultivation?5³0years?on soil pH,total salt content,alkalization degree,total organic carbon,chemical composition,humus composition carbon,aggregate carbon content and aggregate stability were studied respectively.Effects of different amendments on pH value,total salt content,alkalization degree,total organic carbon,water soluble carbon and humus component carbon in soil.The effects of rice planting and different amendments on the improvement and fertilization of soda saline-alkali soil in western Jilin Province were also discussed.The main research results are as follows:?1?Effects of Rice Planting?5-30 Years?on Improvement and Fertilization of Soda Saline-alkali Soil in Western Jilin Province:The results showed that compared with the barren soil before rice planting.Soil pH,total salt content,exchangeable sodium,alkalinity,CO₃^2–?HCO₃^–?Cl^–?Ca²⁺?Na⁺and clay content of<0.053 mm powder decreased significantly after rice planting.The contents of SO₄^2–,total organic carbon,water-soluble organic carbon,humic acid carbon,fulvic acid carbon,alkali-hydrolyzed nitrogen and macroaggregates?2-0.25 mm?increased significantly:At the same time,alkyl carbon and alkoxycarbon content in organic carbon composition increased,while aromatic carbon and carbonyl carbon content decreased,The ratio of aliphatic carbon to aromatic carbon increased,while the ratio of alkyl carbon to alkoxycarbon and hydrophobic carbon to hydrophilic carbon decreased;With the extension of rice planting years,the above changes are usually more obvious.?2?The effects of different aluminum sulfate dosage on the improvement and fertilization of soda saline-alkali soil in western Jilin Province showed that,compared with CK,the pH value,total salt content,exchangeable sodium,alkalization degree,CO₃^2–,K⁺,Ca²⁺,Na⁺and water-soluble carbon of the soil after aluminum sulfate application all showed a downward trend,while the contents of HCO₃^–,Mg²⁺and Cl^–did not change significantly,while the contents of SO₄^2–,total organic carbon,humic acid carbon,inside acid-rich carbon and humin carbon showed an upward trend,and the degree of soil detritus was also improved.When the dosage of aluminum sulfate is 1400 kg/m²,the above change rule is usually more obvious.?3?The effects of different kinds of chemical improvers?Aluminum Sulfate,Desulfurization Gypsum,Sulfuric Acid and Desulfurization Gypsum?combined with cow dung on the improvement and fertilization of soda saline-alkali soil in western Jilin Province showed that,compared with CK,the pH value,total salt content,exchangeable sodium ions,cation exchange capacity and alkalization degree of the soil with different kinds of chemical improvers combined with cow dung would tend to decrease,and the changes of soluble salt components in the soil would be affected,while the contents of total organic carbon,water soluble carbon,humic acid carbon,inside-rich acid carbon and humic acid carbon in the soil would tend to increase.At the same time,The application of aluminum sulfate in combination with cow dung and sulfur powder in combination with cow dung is conducive to improving the quality of humus in the soil,and the change rule of the above indexes is more obvious in the soil with aluminum sulfate in combination with cow dung.?4?The improvement and fertilization effects of different kinds of organic fertilizers?cow dung,sheep dung and rice straw?combined with aluminum sulfate on soda saline-alkali soil in western Jilin Province for two consecutive years.The results show that in the first year,compared with CK,the pH value,total salt content,exchangeable sodium ions,cation exchange capacity and alkalization degree of different kinds of organic fertilizers combined with aluminum sulfate soil have no significant changes,while the contents of soil total organic carbon,water soluble carbon,humic acid carbon,inside acid rich carbon and humin carbon generally increase.In the second year,the same organic fertilizer and aluminum sulfate will be added on the basis of the first year.Compared with the first year,the pH value and alkalization degree of the soil with different organic fertilizers and aluminum sulfate will show a downward trend in the second year.The contents of organic carbon,water soluble carbon,humic acid carbon,inside-rich carbon and humic acid carbon in the soil will all increase.At the same time,the application of different organic fertilizers and aluminum sulfate for two consecutive years will improve the quality of soil humus,and the above indexes change rule is more obvious in the soil with cow dung and aluminum sulfate for two consecutive years.