32 results about "Cation-exchange capacity" patented technology

The invention relates to the technical field of sewage treatment, in particular to an urban sewage treatment plant sludge deep dehydration conditioner and an application method thereof, and the urban sewage treatment plant sludge deep dehydration conditioner comprises the following raw materials: functional layered composite powder, cationic polyacrylamide, diatomite and sodium carbonate. After the functionalized layered composite powder and the bentonite are organically modified by the lauryl trimethyl ammonium bromide, the interlayer spacing is obviously increased, the hydrophobic property and the cation exchange capacity are excellent, negative charges on the surface of sludge colloid can be efficiently neutralized, a double-electrode-layer structure can be destroyed, and part of bound water can be released; ferric hydroxide deposited on the surface serves as amphoteric metal hydroxide, further compresses double electric layers through electric neutralization, forms an amorphous net structure and serves as a high-efficiency adsorption flocculation net to capture fine sludge particles; under the synergistic effect of the powder and cationic polyacrylamide, efficient removal of water combined with sludge and water in cells is achieved, and the dual purposes of deep dehydration and mud cake volume reduction are achieved.

The invention belongs to the technical field of soil amendments, and particularly relates to a saline-alkali soil biological-mineral composite amendment prepared from industrial waste and a preparation method thereof. Alkali fusion activated steel slag provides a quick-acting active calcium source, hydrothermal modification neutralized red mud forms hydrated aluminosilicate gel solid sodium, modified biochar enhances cation exchange capacity, a composite functional bacterial agent drives MICP biomineralization reaction, a quick-acting-slow-release-storage three-stage gradient improvement system is established, and the quick-acting-slow-release-storage three-stage gradient improvement effect is achieved. According to the present invention, the effects of 0-50 cm soil profile full-layer improvement and 12-24 month continuous improvement are achieved, 90 d after the modifier is applied, the soil pH value of the severe saline-alkali soil is reduced to 7.8 from 10.1, the conductivity is reduced to 3.2 dS / m from 11.5 dS / m, the sodium adsorption ratio is reduced to 11 from 42, the crop yield increase amplitude reaches 40-60%, 15-25 kg of the modifier is fixed per ton, and the industrial waste resource utilization rate gt is achieved; 90%.

The invention discloses an iron-phosphorus biochar-based fertilizer suitable for saline-alkali soil, which has a good nutrient slow-release characteristic, and also provides a preparation method and an application approach of the fertilizer. According to the product, biomass which is wide in source and low in cost is taken as a basic raw material, and nutrient elements such as nitrogen, phosphorus and potassium are successfully converted into various forms with a slow-release function by introducing iron-phosphorus composite modification and combining a high-temperature pyrolysis technology, so that the utilization efficiency and the lasting supply capacity of nutrients are greatly improved. The prepared biochar-based fertilizer can effectively optimize the physical and chemical environment of saline-alkali soil, for example, increase soil organic matters and enhance cation exchange capacity, also can relieve adverse effects of salt stress on rice growth, and supports healthy development of saline-alkali tolerant rice. The method is simple and convenient in process, high in environmental compatibility and remarkable in economic benefit, and has wide popularization value and application potential in the aspects of saline-alkali soil improvement and crop safety production.

This application discloses a method for reducing the arsenic content of rice grown in alkaline arsenic-polluted paddy fields, belonging to the field of soil remediation technology. The method involves pretreating air-dried electrolytic manganese slag, zeolite, and desulfurized gypsum. The pretreated electrolytic manganese slag, natural zeolite, and desulfurized gypsum are then mixed uniformly to obtain an EMR-ZL-FGD mixed sample. This mixed sample can alter the speciation of arsenic in the soil and effectively reduce the available arsenic content. When the EMR-ZL-FGD addition is 2 wt%, the available arsenic content in the soil is reduced by 50.34%. Soil pH and cation exchange capacity are positively correlated with available arsenic content, while redox potential is negatively correlated. The passivating material EMR-ZL-FGD can effectively reduce the arsenic content in the underground roots, aboveground stems and leaves, and grains. Furthermore, the higher the EMR-ZL-FGD addition, the less arsenic is accumulated in the rice.

The invention relates to the field of disaster prevention and reduction of underground engineering, and provides a prediction and analysis method for water gushing and mud bursting disasters of a tunnel in order to improve the accuracy of prediction of the water gushing and mud bursting disasters. The water content and the permeability are directly obtained, and the water-containing body characteristics are distinguished through the cation exchange capacity, so that the recognition precision is improved. The water inflow is calculated through the volumetric water content distribution, and calculation crossing of the water inflow from qualitative and semi-quantitative to quantitative is achieved; and actually-measured cloud picture data is substituted into numerical simulation, so that high-precision calculation is realized, and the accuracy of prediction and analysis of water burst and mud burst disasters is higher.

This invention discloses a method for preparing an attapulgite-based acidic soil remediation agent. The method includes: (1) mixing urea solution and biochar and reacting them hydrothermally to obtain urea-modified biochar; (2) mixing attapulgite, calcium silicate, and urea-modified biochar to obtain the attapulgite-based acidic soil remediation agent. Compared with the prior art, applying the remediation agent of this invention to acidic soil in a single application can not only improve various physicochemical indicators such as soil pH, electrical conductivity, water holding capacity, alkaline nitrogen, available phosphorus, available potassium, soil organic matter, and cation exchange capacity, but also enhance soil enzyme activity and promote crop growth and development.

The invention discloses a soil cation exchange capacity detection method based on color developing solution image recognition, and relates to the technical field of soil physicochemical property detection. Comprising the following steps: acquiring a supernatant image after a soil sample of to-be-detected soil reacts with a methylene blue solution under a multi-light-source condition; zero-sample semantic segmentation is carried out on color blocks in the supernatant image to extract position information of different color developing areas in the color blocks, and color partitions are obtained; performing color correction on the color subareas to eliminate color deviation of the color subareas under different light source conditions to obtain RGB parameters of the methylene blue circular color development area; and inputting the RGB parameters into an extreme gradient lifting algorithm so as to fit a numerical relationship between the color concentration of the color developing area and the soil cation exchange capacity, thereby obtaining the soil cation exchange capacity of the soil to be detected. According to the method, a complex chemical detection process is converted into a visual calculation task, and an artificial chemical process depending on multiple ion exchange, washing and titration is simplified.

The present invention relates to a layered silicate having a cation exchange capacity in the range of 70-130 meq / 100 g, having leachable sodium cations in the range of 65-130 meq / 100 g, having leachable magnesium cations in the range of 5-65 meq / 100 g, having leachable calcium cations in the range of 15-95 meq / 100 g, and having a cation exchange capacity in the range of 70-130 meq / 100 g, having leachable sodium cations in the range of 65-130 meq / 100 g, having leachable magnesium cations in the range of 5-65 meq / 100 g, having leachable calcium cations in the range of 15-95 meq / 100 g, and wherein the sum of the leachable sodium, magnesium and calcium cations is at least equal to the cation exchange capacity, and wherein an aqueous suspension containing 5% by weight of the layered silicate has a rotary viscosity at 10 rpm of 30 mPas or higher measured at a temperature of 23 DEG C.

The present application relates to the field of agricultural ecological environment management and carbon sink monitoring technology, and more particularly to a tea tree lossless tea garden carbon fixation and sink increase method, comprising: pyrolyzing agricultural waste to obtain biochar and making the biochar into a specific standard biochar-based fertilizer; determining tea garden soil organic matter, cation exchange capacity and soil bulk density, calculating soil quality comprehensive coefficient by using improved Nemerow comprehensive index method and dividing soil quality grades according to the soil quality comprehensive coefficient; applying the biochar-based fertilizer in a differentiated application amount according to the soil quality grades; determining tea tree aboveground biomass after fertilization and calculating tea tree carbon storage according to a corresponding carbon storage model selected according to the age of the tea tree; simultaneously determining soil parameters to calculate tea garden soil carbon storage; and finally taking the tea tree carbon storage and the soil carbon storage as the total carbon sink of the tea garden. The present application realizes systematic, accurate and lossless monitoring of tea garden carbon fixation and sink increase technology.

This invention relates to a microbial composition for preventing and controlling root rot in tea trees and its application, belonging to the field of microbial and organic fertilizer technology. The composition comprises the following components: Component 1, Bacillus kaempferi and Trichoderma yunnanensis; Component 2, humic acid, Chrysanthemum indicum extract, amino acids, brown algae oligosaccharides, complex vitamins, and trace elements; wherein, Bacillus kaempferi is N4471 (…). Bacillus cabrialesii The accession number is CCTCC NO: M20221660, and the Yunnan Trichoderma is YNK-FG0001 ( Trichoderma yunnanense The microbial composition, with accession number CCTCC NO: M 2025645, significantly improved soil water stability aggregates, pH, and cation exchange capacity when applied to tea plant cultivation. It also enhanced root vitality and the activity of antioxidant enzymes [superoxide dismutase (SOD) and peroxidase (POD)], thereby reducing the growth of Fusarium rot (…). Fusarium solani ), Pythium ( Pythium spinosum ) and teosinte ( Rosellinia arched The disease index of tea tree root rot caused by infection was used to ultimately achieve effective control of tea tree root rot.

The present application relates to the technical field of shale gas drilling solid waste resource utilization, in particular to a method for improving water-based drilling cuttings by using rotten straw and artificial soil prepared by using the water-based drilling cuttings. The method for improving water-based drilling cuttings comprises the steps of leaching, sieving and mixing water-based drilling cuttings with sieved rotten straw, and can effectively improve the texture performance and physicochemical properties of water-based drilling cuttings, especially the soil cation exchange capacity and permeability, and can be used for treating water-based drilling cuttings generated in oil and gas exploitation. The method for improving water-based drilling cuttings can effectively overcome the problems of high cost, complicated operation, limited source of treatment agent and unsatisfactory improvement of soil texture performance in the prior art.

This invention discloses a method for predicting cation exchange capacity (CEC) based on changes in soil hygroscopic water content. The method comprises the following steps: S1: Determining the water activity range based on the soil water vapor adsorption mechanism; S2: Determining two reagents based on the water activity range determined in S1 and the safety and cost considerations of using saturated salt solutions to control water activity, and determining the specific water activities of the two reagents; S3: Selecting multiple samples and determining the soil CEC using conventional methods, while simultaneously determining the soil hygroscopic water content of the samples at the specific water activities of the reagents determined in S2; S4: Establishing a predictive model between the change in hygroscopic water content and CEC within the specific water activity range; S5: Determining the hygroscopic water content of the sample under test at the two specific water activities and calculating the change in hygroscopic water content, then using the predictive model to calculate the CEC of the soil sample. This method can quickly and accurately predict soil CEC when dealing with a large number of samples, saving time, manpower, and testing costs.

The present application belongs to the technical field of soil spectrum detection and agricultural informatization, and discloses a multi-modal spectrum soil property estimation method based on task priori gated distillation. Visible-near infrared reflectance spectrum, X-ray fluorescence spectrum and laser-induced breakdown spectrum of the same sample are obtained, and after pretreatment, teacher soft labels and intermediate features are generated by PLS, SF-PLS and GR chemometric teacher models; the student network extracts modal features through three one-dimensional convolution branches, adopts GeM / TopK aggregation, Dirichlet task gating and double expert prediction modules for fusion and regression, and is jointly trained by output distillation, feature distillation, true value regression and gating regularization. In the inference stage, only the student network is deployed for clay, organic matter, cation exchange capacity, pH, base saturation and extractable phosphorus, potassium, calcium and magnesium estimation.

This invention discloses a method for preparing attapulgite-based hydrogel. The method includes: (1) mixing ethylene carbonate, ethylene glycol, phosphoric acid, and straw powder and heating to react, obtaining liquid biomass; (2) mixing acid-modified attapulgite, acrylic acid, acrylamide, and liquid biomass in water, then adding a crosslinking agent to react and obtain the attapulgite-based hydrogel. Compared with the prior art, the attapulgite-based hydrogel of this invention not only reduces the salinity of saline-alkali soils but also significantly increases the soil's cation exchange capacity and the levels of key N and K nutrients.

The invention discloses a fertilizer synergist based on marine biogen functional group modification and a preparation method and application thereof, and relates to the technical field of agricultural biotechnology and novel fertilizer additives, and the preparation method comprises the following steps: raw material pretreatment: taking marine algae, shellfish or marine fish processing leftovers as raw materials, cleaning, crushing to 60-100 meshes, and drying to obtain the fertilizer synergist; according to the method, marine biogen is taken as a raw material to obtain marine biogen coarse powder, active functional groups such as sulfonic groups and carboxyl groups are successfully introduced to a molecular skeleton of the marine biogen through alkaline hydrolysis and a specific functional group directional modification process, and a final product has high cation exchange capacity and pH buffer characteristics based on Hexchange and neutralization reaction through ion exchange treatment; the synergist can adsorb and preserve nutrient ions, and after the synergist is applied to soil, through interaction of functional groups of the synergist and ions of a rhizosphere environment, the pH of a micro-domain can be easily adjusted to be neutral, so that favorable conditions are created for effective utilization of nutrients, and meanwhile resource utilization of marine processing leftovers is achieved.

The present application relates to the field of underground engineering disaster prevention and mitigation, in order to improve the accuracy of water inrush and mud disaster prediction, a kind of tunnel water inrush and mud disaster prediction analysis method is provided. By directly obtaining water content and permeability, and distinguishing the characteristics of water body by cation exchange capacity, the identification accuracy is improved. The water inrush is calculated by using the volume water content distribution, which realizes the qualitative and semi-quantitative to quantitative calculation of water inrush. And the measured cloud data is brought into numerical simulation, high-precision calculation is realized, and the accuracy of water inrush and mud disaster prediction analysis is higher.

The present application relates to sewage treatment technical field, specifically, it relates to a kind of urban sewage treatment plant sludge deep dewatering conditioning agent and its application method, it includes the following raw materials: functionalization layered composite powder, cationic polyacrylamide, diatomite and sodium carbonate.Functionalization layered composite powder is used in the present application, after bentonite is organically modified by lauryl trimethylammonium bromide, interlayer spacing significantly increases, with excellent hydrophobicity and cation exchange capacity, can efficiently neutralize the negative charge on the surface of sludge colloid, destroy double electric layer structure, release part of bound water;Iron hydroxide deposited on its surface as amphoteric metal hydroxide, further through electric neutralization compresses double electric layer, and forms amorphous reticular structure, acts as high-efficiency adsorption flocculation net, captures small sludge particles;The synergistic effect of the powder and cationic polyacrylamide realizes the efficient removal of sludge bound water and intracellular water, achieves the dual goal of deep dewatering and sludge cake volume reduction.

The present application relates to a kind of shale formation dynamic permeation pressure prediction method, comprising the following steps: based on shale cylinder sample, obtain shale porosity, density and cation exchange capacity, calculate to obtain the solute concentration parameter inside and outside shale, to obtain shale initial membrane efficiency;Test and obtain the activity of drilling fluid and shale, on this basis, carry out drilling fluid and shale soaking experiment, test and obtain the porosity and density of shale under the action of drilling fluid at different times, and then calculate the shale membrane efficiency deterioration coefficient under different drilling time;Comprehensive drilling fluid activity, shale activity, initial membrane efficiency and membrane efficiency deterioration coefficient, establish the shale formation dynamic permeation pressure prediction method considering the influence of drilling fluid.The present application can reflect the shale membrane efficiency deterioration law and permeation pressure dynamic change law under the influence of drilling fluid, and then determine the driving characteristics of drilling fluid invasion shale in drilling process, which is helpful to establish shale formation safe drilling technology.

The invention discloses a method for evaluating the influence of microplastic-heavy metal interaction in soil on the quality of scutellaria baicalensis, and particularly relates to the technical field of traditional Chinese medicinal material planting environment evaluation. The method comprises the following steps: collecting a soil sample in a scutellaria baicalensis planting area, measuring the content of microplastics and heavy metals and calculating a coupling enrichment coefficient; fusing the soil pH, the organic matter content and the cation exchange capacity, constructing a response factor matrix and extracting rhizosphere influence factors; measuring the contents of flavonoid components of roots, stems and leaves in the growth period of scutellaria baicalensis, and establishing a quality feature set; non-linear fitting between pollution factors and quality characteristics is realized based on an artificial neural network model; constructing a risk index through K-fold cross validation, identifying a high-risk area, and outputting a dominant pollution factor; according to the method, accurate prediction and main cause tracing of the quality risk of the traditional Chinese medicinal materials under the combined pollution scene can be realized, and a scientific basis is provided for green planting and environment regulation and control.

The invention discloses a soil remediation agent and application thereof, and belongs to the technical field of soil remediation. The soil remediation agent comprises micro-nano bone black and a penicillium fistulosum solid fungicide. Penicillium fimbriatum can convert insoluble phosphorus in soil into available phosphorus and increase phosphorus nutrition of the soil, micro-nano bone black can improve cation exchange capacity of the soil and enhance water and fertilizer retention capacity of the soil, and soil fertility can be comprehensively improved by combining the two. The phosphorus-solubilizing fungus and micro-nano bone black combined remediation technology is adopted, dissolution of insoluble phosphate can be effectively promoted, and the content of available phosphorus in soil is increased by 2.69 times; the soil heavy metal cadmium (Cd) can be fixed, the effective state Cd of the soil is reduced by about 25.91%, and the soil heavy metal cadmium (Cd) fixing agent has high Cd fixing capacity and has good application value in farmland Cd pollution remediation and environmental protection. The soil remediation agent provided by the invention not only can realize efficient remediation of cadmium-contaminated soil, but also is green and environment-friendly, and is suitable for large-scale popularization and application.

The application discloses a red clay modification treatment method for heavy metal pollution remediation, which comprises the following steps: dispersing natural red clay in deionized water, and obtaining a clay suspension after fully stirring the natural red clay and the deionized water; sequentially adding sodium citrate solution and sodium bicarbonate solution into the clay suspension, and adding sodium disulfite during water bath heating. The red clay modification treatment method for heavy metal pollution remediation removes free iron oxide, complex iron oxide and amorphous iron oxide and other colloidal oxides existing in the original red clay by a selective chemical dissolution method, eliminates the shielding effect of the colloidal oxides on the active sites of clay minerals in the red clay, and adds different proportions of aluminum oxide colloids in the red clay from which the colloidal oxides are removed, so that the active sites, the specific surface area and the cation exchange capacity of the clay minerals in the red clay are improved, thereby effectively improving the adsorptivity of the red clay, and the soil environment is not polluted.

The invention discloses preparation of an immobilized material based on phosphate solubilizing bacteria and application of the immobilized material in soil, and belongs to the technical field of soil remediation microbial agents. The material takes bacillus megatherium and lignin as core functional components, and takes a mixed system of sodium alginate and sodium carboxymethyl cellulose as a carrier. The immobilized material is high in mechanical strength, good in stability and excellent in mass transfer efficiency, meanwhile, insoluble phosphorus is activated through metabolites secreted by bacillus megatherium, and the content of available phosphorus in soil is increased. The material can also improve the soil structure, improve the cation exchange capacity and the organic matter content, enhance the activities of peroxidase and superoxide dismutase of the rice, reduce the content of malonaldehyde, relieve oxidative damage caused by Cd stress, reduce Cd accumulation of the rice from the source and guarantee normal growth of the rice.

The invention discloses a high-efficiency multi-position stirring device for a soil cation exchange capacity testing process, which comprises an adjustable material placing frame assembled on a longitudinal guide rail of a base in a sliding manner, an assembling frame is mounted on the base, and the assembling frame is connected with a transverse mounting beam through a lifting mechanism mounted on the assembling frame; a plurality of multi-position stirring mechanisms are mounted on the transverse mounting beam at intervals in the length direction of the transverse mounting beam, a plurality of rows of sample tubes are placed on the adjustable material placing frame at intervals in the sliding direction of the adjustable material placing frame, and the lower part of each multi-position stirring mechanism extends into the corresponding sample tube. According to the invention, no dead angle in stirring and sufficient mixing are ensured, attachments on the pipe wall can be scraped, the test precision is ensured, and the whole operation is automatic and high in flexibility. The invention is applicable to the technical field of soil cation exchange capacity testing equipment.

A method for determining the cation exchange capacity of a sample material, including: preparing a Cu-Trien stock solution by adding an amount of copper (II) sulfate and triethylenetetramine to water to a measured concentration; establishing one or more Cu-Trien calibration curves; adding an amount of the Cu-Trien stock solution to the sample material; measuring and recording the mass of the sample material after the addition of the Cu-Trien stock solution; homogenizing the sample material after the addition of the Cu-Trien stock solution; passing the sample material through a filter to form a filtrate after homogenizing the sample material; scanning and measuring the filtrate with a spectrophotometer; and calculating the cation exchange capacity of the sample material.

This invention belongs to the field of soil improvement and precision agriculture technology, specifically involving a method for precise application of soil conditioners based on soil physicochemical properties, including the following steps: S1, grid-based sampling of the target field, measuring multiple physicochemical properties of soil samples at each sampling point, wherein the multiple physicochemical properties include at least soil pH, soil organic matter content, and soil cation exchange capacity (CEC); significantly improved accuracy: through grid-based sampling and spatial analysis, the degree and type of soil obstacles at different locations within the field are accurately identified, achieving "tailored measures based on soil conditions and application as needed"; good comprehensive improvement effect: breaking through the limitations of single-indicator improvement, multiple key physicochemical properties such as pH, organic matter content, and CEC are incorporated into a unified decision-making framework, and the optimal comprehensive application amount is given through a multi-indicator collaborative decision-making method, achieving a comprehensive improvement in soil quality.

The utility model discloses a hold-down device for cation exchange capacity pretreatment equipment, which comprises a pretreatment equipment body and a plurality of water outlets arranged at the lower part of the pretreatment equipment body, a funnel and a suction flask are sequentially arranged at the lower part of any water outlet, a filter plate is arranged in the funnel, filter paper is arranged on the filter plate, a compression ring is sleeved in the funnel, and the compression ring is connected with the suction flask. A pressing ring capable of turning laterally is arranged on the upper portion of the pressing ring, one side of the pressing ring is connected with a turning plate, the tail of the turning plate is fixedly connected with the telescopic cylinder through a hinged support, supporting rods are hinged to the two sides of the middle of the turning plate respectively, and the supporting rods extend downwards and are hinged to a supporting seat. According to the utility model, the turnover pressing ring is arranged at the upper part of the pressing ring, so that a series of problems caused by the fact that a soil mixed solution flows into the suction flask during measurement are fundamentally solved, the experiment effect is better ensured, the loss of a soil sample is greatly prevented, and the working efficiency is improved.

The invention discloses an online continuous detection system and method for cation exchange capacity of montmorillonite slurry. The system is composed of a sampling module, a solid content determination module, a flow path control module, a closed circular reaction unit, a bypass solid-liquid separation module, an online optical detection module, a data processing module, a control module and a cleaning module. The method comprises the following steps: automatically diluting a sample according to the solid content, mixing with a Cu-Trien reagent pre-balanced by carbonate, and fully reacting in a closed circular reaction channel; in the reaction process, low-turbidity clarified liquor is continuously obtained by bypass micro / cross flow filtration and enters a flow-through optical detection pool for real-time absorbance measurement. The system adopts a dual-stability criterion triggering terminal point, the residual Cu-Trien concentration is inversely calculated according to a calibration curve, and CEC is calculated by combining the solid content. According to the scheme, full reaction and non-turbidity interference of an online spectrophotometric method are considered, carbonate errors are reduced, and real-time, accurate and continuous monitoring of CEC in the production process is achieved.

The application provides a soil conditioner for jujube garden soil in a sandy area and application of the soil conditioner in improving jujube garden soil in the sandy area and fruit quality. The application first proposes a combination of phosphoric acid modified biochar and graphene modified bentonite, which is applied to improve the jujube garden soil in the sandy area, has excellent synergistic effects on improving soil cation exchange capacity content, increasing soil water content, and increasing the percentage content of water stable aggregates, and the like. The application also studies the effect of soil conditioner treatment on improving jujube fruit quality, wherein the soil improved by the soil conditioner has outstanding effect on improving fruit quality, especially in increasing the vitamin C content, protein content, total sugar content, fruit transverse diameter, single fruit weight in Junzao fruit, and reducing the organic acid content in the fruit.

This application provides a method for improving farmland quality through the synergistic effect of water-retaining agents and microbial stratification. The method is used to treat farmland in semi-arid sandy soil areas and includes the following steps: applying a first mixture at a first depth below the surface to form a first target layer, the first mixture comprising microbial fertilizer and straw; applying a second mixture at a second depth below the surface to form a buffer layer, the second mixture comprising humic acid and calcium-based bentonite; and applying an ionic synthetic water-retaining agent at a third depth below the surface to form a second target layer. The first target layer, buffer layer, and second target layer are arranged sequentially from bottom to top. The buffer layer is used to promote microbial metabolic activity through ion regulation. This application, by constructing a buffer layer with high cation exchange capacity and high complexing ability, compensates in situ for the chemical buffering shortcomings of sandy soil, fundamentally breaking through the technical bottleneck of the mutual constraint between water retention and biological growth promotion functions, and significantly improving farmland quality.