Improved On Modifier Formula And The Results Of Improving Of Severe Soil Salinity

This article summarizes the land salinization in the development and the current mechanism and theuse of saline-alkali soil improvement of the status quo. focuses on the western region of the jilin provincein the distribution of saline soil conditions improved over the years and the use of progress. On this basisto the western Jilin soda severe soil salinity study (pH＞10, ESP＞60%). A pot and field trials, the rightmodifier for screening test, Through modifier different amount of soil properties and effectes of thedevelopment of the crop growth, Examine its severe salinization of the soil to improve results.The results showed that different modifier on soil physical properties are different, With the activationof calcium dosage increase, 1～0.25mm soil micro-aggregates content gradually increase, Bulk density isgradually declining.The descent of the bulk density showed that compact,bad structure soil become loose,The improvement of 1～0.25mm microaggregate showed that the soil granule structure was amelioratedand it formed a good soil granule structure which fits for the growth of the plant.The soil fertility wasimoroved.Different modifier to improve soil chemical properties also have different performance. As theincrease of the using level of activator,the pH,total alkalinity,exchangeable sodium droppedquickly,which was very obvious But as far as the treatment that had not calcium activator isconcerned,the physical and chemical character of the soil is same to the original soil,which showed theactivating effect of the calcium activator. Calcium activating agent in improved alkaline earth play a largerole. Also, perhaps because of the short time, there is mot significant diference among the improvement ofthe enzyme activity and nutrition in the soil.There was mot significant diference among the treatments.Different modifier formula on soil properties and crop growth and development of the integratedeffects, Calcium-containing substances, calcium activator and the husks of improving the results obviously,and the study of pre-screening results are consistent formula.Modifier used in the creation of different dosage pot experiment, The results show different modifieramount of soil physical properties are different, With modifier usage, Soil bulk density decreased gradually,And the permeability coefficient has gradually increasing trend, This trend can be seen soil physicalstructure gradually improved.In soil chemical properties of different modifier usage also showed different effects, Soil pH,exchangeable sodium, alkali, CO₃^2- and HCO₃^- are with the amount of the increase result to reduced, Saltand total control compared to a different extent, K⁺, Na⁺ content reduced, Ca²⁺, Mg²⁺ content increased. Shi-modifier after soil nutrient content and an increase compared to the control, Organic matter, alkali-soluble nitrogen, available phosphorus, potassium content effectively have different degrees ofimprovement, But different dosage little difference.Modifier different test for the amount of the wheat crop growth and development of impact isdifferent. With modifier usage, Emergence increased gradually, Height, fresh weight, Ear Weight tends toincrease. When the content reaches a certain value, Height, fresh weight, the slow increase of 10-dayintervals, The difference between the amount was not significant, Note there is a most appropriate dosage.Upon analysis of the experimental conditions more suitable dosage of 2.5kg/m².The trial of the modifier improved alkaline earth a short time, effective, to improve the severe soilsalinity. It's a rapid decline of soil pH and removes Na₂CO₃. The mechanism may be: modifier of calciumphosphate gypsum material and superphosphate itself acidic. Calcium is an activator acid, added toalkaline earth occurred, and acid-base reaction, quickly reduce the soil PH. Phosphogypsum SSP and theactivation of calcium by the calcium-activated, can be exchanged on the soil colloid adsorption of sodium,soil exchangeable sodium content, that is, to lower the alkaline soil, alkaline soil-improvement The highlydispersed colloidal quickly formed a micro-aggregates, improving ventilation Permeability. Another Ca²⁺and CO₃^2- reaction, forming calcium carbonate precipitation, in the soil environment CO₃^2- and HCO₃^- canbe transformed into each other, in a dynamic equilibrium, This will largely reduce the soil CO₃^2- andHCO₃^- content so that the soil to reduce the Na₂CO₃ for desalination of saline-alkali soil from the base tocreate the conditions.