5 results about "Exchangeable sodium" patented technology

The invention discloses a soda saline-alkali soil improvement method combining electrodynamics with aluminum sulfate application, which comprises the following steps: applying an aluminum sulfate modifier in soda saline-alkali soil to distribute the aluminum sulfate modifier in surface layer or plough layer soil; the method comprises the following steps: burying an anode on the surface layer of a soil body of soda saline-alkali soil, and burying a cathode below a target improvement depth to form a vertical or approximately vertical electrode system; and applying a direct-current electric field to the soil body to realize electric improvement of the soda saline-alkali soil, and supplying water to the soil body in the electric improvement process. According to the method, the soil structure is improved through aluminum sulfate, and the electroosmosis effect and the electromigration effect generated under the action of an external electric field are combined, so that the migration ability of moisture and salt in the low-permeability soil is enhanced; the aluminum-based ions migrate to the cathode side under the action of an electric field, so that the problems of salt enrichment and aggravation of the alkalization degree easily occurring in a cathode area in the electric improvement process are solved, and salt and exchangeable sodium in the soda saline-alkali soil are effectively removed.

The invention relates to an in-line system for the physical conditioning of agricultural irrigation water using electrical pulses, designed to mitigate the adverse effects of exchangeable sodium in agricultural soils. The system works by modifying the physical-ionic interaction of sodium at the water-soil interface, without removing sodium from the water or using chemicals. The system is applicable to continuous agricultural irrigation, improves soil structure, water infiltration, and root absorption, and can operate independently or in conjunction with other treatment systems.

The invention provides a preparation method of efficient carbon sequestration iron modified biochar and application of the efficient carbon sequestration iron modified biochar in improvement of coastal saline-alkali soil, and relates to the technical field of soil remediation. The iron-modified biochar is prepared by the following steps: by taking corn straws and jute straws as raw materials, firstly preparing biochar by a pyrolysis method, then oxidizing the biochar by utilizing potassium permanganate, then performing grafting modification by utilizing bismaleimide to obtain bismaleimide grafted modified biochar, and finally performing dipping treatment in a FeCl3 solution with the concentration of 0.4-0.5 mol / L to obtain the iron-modified biochar. The iron-modified biochar can reduce the pH, EC, exchangeable sodium content and alkalization degree of soil and increase the total phosphorus and total nitrogen content of coastal saline-alkali soil, has excellent coastal saline-alkali soil improvement and carbon sequestration capabilities, and can improve nutrient circulation of the coastal saline-alkali soil.

The invention relates to the technical field of geological monitoring, in particular to a microorganism prediction method for monitoring, preventing and treating karst rocky desertification. Comprising the following steps: S1, respectively collecting land soil samples in a karst region and a non-karst region, and determining soil physicochemical properties including soil pH, soil total nitrogen, soil nitrate nitrogen, soil available phosphorus, soil total potassium, soil available potassium, soil exchangeable calcium, soil exchangeable sodium, soil chloride ion content and soil organic carbon; s2, the stony desertification succession process is analyzed through the vegetation coverage degree of the karst region, the correlation between the stony desertification succession process and the soil physicochemical properties is calculated, and the difference statistics of the soil physicochemical properties is obtained according to the correlation; s3, respectively extracting total DNA of the soil samples in each region, and analyzing to obtain composition characteristics of florae in the soil samples; s4, quantifying flora richness change through a specific measurement algorithm, and evaluating the stability of the microflora by adopting a parameter dispersion method; s5, taking bacteria and fungal species in the rocky desertification succession soil microbiome in the karst region and relative abundance in each corresponding sample as data, establishing an attribute feature set, and determining new biological indicator information based on an attribute data set; and S6, establishing a microorganism prediction model of karst rocky desertification monitoring control work.

The invention discloses an application of polyaluminum ferric silicate for reducing the content of exchangeable sodium in soda saline-alkali soil, relates to the technical field of soil improvement, and particularly relates to an application of treating soda saline-alkali soil by using polyaluminum ferric silicate. The invention aims to solve the problems of poor stability and poor environmental protection of the traditional soil modifier. The polysilicate aluminum ferric is applied to the soda saline-alkali soil through turning and stirring, and the application amount is 0.3%-5% of the total amount of soil with the depth of 20 cm. The method is low in cost and convenient to treat, can be applied to large-area saline-alkali soil, effectively reduces the exchangeable sodium content of the soda saline-alkali soil, and eliminates alkaline obstacles of the soda saline-alkali soil.