Study On Rapid Improvement Of Sodic Soil For Fertilizing Turfgrass

The saline-alkali soil in Songnen Plain has a large area,and the saline-alkali soil irrigated with water is one of the common ways of rice utilization.However,the utilization of heavy saline-alkali land is still limited.For example,at present,black soil is often used as the cultivation medium for lawn planting in the market,which takes up the resources of black soil and seriously damages the cultivated layer,this is the starting point of this paper.Taking three kinds of alkaline soils in changling and Qian’an of Jilin Province as experimental objects,using the abundant sandy soil resources in the region,a kind of planting structure of top alkaline soil and bottom sandy soil was constructed,using Inorganic amendments（CASO42H2O）,hydrophobic materials（furnace ash,sand and Straw）,sulfuric acid and rice straw as improving materials,adopting rapid improving and fertilizing techniques,and planting turf,the change of physical and chemical properties of the improved soil and its effect on the growth of Turfgrass were studied in order to find out a suitable improvement scheme for planting grass on alkaline soil,and to provide scientific basis for the rational utilization of the improved grass on heavy alkaline soil in Jilin region.The main findings of this study are as follows:（1）The soil exchangeable sodium decreased in different degrees in each treatment,and the decreasing range was between 0.6-3.29 cmol/kg.In the rapid improvement,the treatment of alkaline soil plus 2%calcium sulfate and soil volume of 33%straw had the largest decrease,and in the improvement of fertilizer,alkaline soil plus 2%sulfuric acid plus soil weight 2%calcium sulfate plus 33%volume of rice straw The treatment and alkaline earth plus 2%sulfuric acid plus soil weight 2%calcium sulfate plus double water leaching two treatments have a larger decline,to add 2%sulfuric acid plus soil weight 2%calcium sulfate plus volume 33%The treatment of rice straw is the best.（2）Compared with the CK treatment,the soil p H,alkalinity and total alkalinity of each treatment showed a decreasing trend.The treatment of rapid improvement with 2%calcium sulfate and 33%straw by soil volume decreased the most.In the treatment of 2%soil weight sulfuric acid plus soil weight 2%calcium sulfate plus volume 33%rice straw and alkaline soil plus 2%sulfuric acid plus soil weight 2%calcium sulfate plus double water leaching,the two treatments decreased.The range is relatively large,and the optimal treatment is the addition of2%sulfuric acid,2%calcium sulfate by weight,and 33%by volume of rice straw.（3）Turfgrass plants in each soil treatment had obvious advantages over CK,among which the treatment with alkaline soil plus 2%calcium sulfate and sulfuric acid supplemented by 33%straw decomposed by volume had the most obvious improvement in plant quality.（4）In the treatments of improving fertilization,the organic matter of each treatment increased significantly,and the absorption intensity of HA structure of each treatment increased at 2920,2850,and 1620 cm-1.Among them,alkaline soil plus 2%sulfuric acid plus 2%soil weight.The treatment of calcium sulfate plus 33%by volume of rice straw was higher than other treatments,I2920/I1720 and I2920/I1620 both increased,and the aliphatic carbon/carboxyl carbon and aliphatic carbon/aromatic carbon of soil humic acid increased,indicating that the improved culture Fertilizer reduces the degree of condensation and oxidation of the soil humic acid structure,enhances the aliphatic property and reduces the aromaticity,and the humic acid structure develops to aliphatic,simplified and younger.（5）The absolute value of Zete potential of soil particles with soil amendments<0.002 mm decreased in different degrees when the amount of inorganic amendments(CaSO_4·2H₂O)was used,based on the DLVO theory,the stability of colloidal particles is determined by the relative magnitude of repulsion force and attraction force between colloidal particles.The closer the absolute value of soil particles is to zero,the easier it is for soil particles to agglomerate,thus improving the physical structure of soil and increasing the saturated hydraulic conductivity of soil.The change of the Zete potential of the soil less than 0.002 mm was the largest in the alkaline soil with 2%of sulfuric acid and 2%of calcium sulfate and 33%of rice straw,mild alkaline soil increased by 9.593 units to-1.537.The medium alkaline soil increased by 10.795units,with a value of-3.475.The elevation of heavy alkaline soil was 9.164 and-0.845.Compared with CK,the percentage of soil particle in the corresponding treatment increased obviously.With the leaching of water,the content of CO₃^2-,HCO₃^-And PH of soil decreased gradually,which further improved the physical and chemical properties of soil,accelerated the formation of soil micro-aggregates,and improved soil properties by cycling,it provides a good growing environment for lawn planting.The growth status of turfgrass showed that all treatments improved the quality of Turfgrass to a certain extent.Fertilizing and improving the soil increased the content of organic matter,as well as various nutrients.According to the change of soil physical and chemical properties and the data of turf plants,the treatment of alkaline soil plus 2%sulfuric acid plus 2%calcium sulfate plus 33%volume of rice straw is suitable for turf cultivation.