49 results about "Soil pH" patented technology

The present application relates to an environment-responsive intelligent controlled-release organic fertilizer and a preparation method thereof, and belongs to the technical field of composite organic fertilizer. In order to solve the problem that the traditional soil improvement method cannot simultaneously improve the efficiency of phosphorus supply and the soil, the present application provides a preparation method of an environment-responsive intelligent controlled-release organic fertilizer. The method comprises the following steps: crushing and drying agricultural and forestry waste, and then placing the waste in a calcium source compound solution to complete preloading; drying and grinding to obtain a preloaded sample; pyrolyzing the preloaded sample in an inert atmosphere to obtain calcium-modified biochar; mixing the calcium-modified biochar with a phosphorus-containing solution to perform adsorption, thereby obtaining phosphorus-loaded biochar; and mixing the phosphorus-loaded biochar with peat and a binder, and then granulating and forming to obtain the organic fertilizer. The organic fertilizer has the environment-responsive characteristic, can adapt to the growth of crops in a three-stage phosphorus release mode, can reduce phosphorus fixation, can improve the soil structure, can stabilize the soil pH, and can improve the differentiation of the micro-niche ecological niche of the soil.

This invention relates to a method for efficiently spraying soil conditioner to treat saline-alkali land using composite microorganisms, belonging to the field of soil improvement technology. The method involves screening salt-tolerant functional microbial strains to prepare a composite microbial agent, which is then mixed with carrier materials such as diatomaceous earth, soybean meal, yeast metabolites, and well-rotted farmyard manure in a specific ratio to form a conditioner for application. The conditioner is applied using a two-stage spraying method, combined with deep tillage pretreatment and controlled temperature and humidity conditions, significantly improving microbial activity and soil condition uniformity. Experimental data show that after applying this method, the soil pH value decreased to 7.3-7.5, the salt content decreased to 0.1%-0.2%, and the organic matter content increased to 18-22 g / kg, achieving efficient ecological restoration and sustainable utilization of saline-alkali land.

The application discloses Paracoccus communis C4-4 and C5-3, the preservation number of which is CGMCC NO:31971 and the classification name of which is Paracoccus communis, and the preservation number of which is CGMCC NO:31972 and the classification name of which is Paracoccus communis. Researches show that C4-4 and C5-3 have strong ecological adaptability and good growth promotion ability, and can improve the internal environment of soil in combination with organic materials. A synthetic microbial population constructed by Paracoccus communis comprises C4-4 and C5-3. Tests prove that the synthetic microbial population comprising C4-4 and C5-3 has the advantages of the synthetic microbial population, the microbial population has high alkali production and growth promotion ability, has good ecological adaptability, the pH adaptation range is 4-8, the manganese stress tolerance can reach 5000 μmol / L, can significantly improve the pH of a culture medium, and has obvious alkalization effect. The synthetic microbial population is used as a microbial agent and is compounded with organic materials to prepare a soil conditioner capable of improving acid soil and promoting plant growth. The conditioner is applied to acid and lean soil, can significantly improve the soil pH, improve the content of soil organic matter, nitrogen, phosphorus and potassium, and promote root growth.

This invention discloses a bio-organic fertilizer suitable for improving alkaline soil, its preparation method, and its application in citrus orchards, belonging to the field of agricultural soil improvement technology. The organic fertilizer is made from 40.00%-50.00% citrus peel residue, 20.00%-30.00% a mixture of sawdust and straw powder, 15.00%-20.00% a mixture of rapeseed meal and soybean meal, 20.00%-30.00% a mixture of livestock and poultry manure, and 0.25%-0.50% ferrous sulfate. Its preparation includes raw material pretreatment, citrus biogas slurry preparation, mixed fermentation, and finished product preparation. During soil improvement, the dosage is determined according to the soil pH value, and it is applied twice using trenching or hole application methods. This invention realizes the resource utilization of agricultural waste, can efficiently improve alkaline soil, solve the problem of iron deficiency and chlorosis in citrus, and is environmentally friendly and easy to operate, suitable for soil improvement in various types of citrus orchards, especially mountainous citrus orchards.

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 utility model discloses a kind of soil pH value detection module power supply of easy installation, mainly related to power supply unit. Including power supply unit body, heat sink and auxiliary structure, the side of power supply unit body is fixed with heat sink by means of auxiliary structure, the side of power supply unit body is equipped with socket, the side of power supply unit body is equipped with adjusting structure, the adjusting structure includes two fixed frames, two the fixed frame and power supply unit body fixed connection, the inner wall of fixed frame is slidably connected with slider, the side of slider is fixedly connected with limit frame, the side of limit frame is fixedly connected with handle, the upper surface of limit frame is fixedly connected with link block, fixed groove is established in the side of link block. The utility model has the beneficial effect that the plug of detection module can be fixed, to avoid detection environment messy to cause plug to separate from the phenomenon easily, so that detection module is more stable and safe in the process of use.

This invention relates to a composite mineral-modified polyethylene agricultural mulch film and its preparation method. The agricultural mulch film comprises a polyethylene matrix resin and a composite mineral filler dispersed therein. The composite mineral filler is composed of 27%~33% wollastonite, 18%~22% attapulgite, 27%~33% tourmaline, and 18%~22% hexagonalite, and undergoes electromagnetic oscillation physical activation treatment to achieve a specific surface area ≥250m² / g, a particle size ≤2μm, and the formation of hydroxyl active sites on the surface. This invention also discloses the preparation method and its dual functions of degradation and soil improvement. The agricultural mulch film has a tensile strength ≥18MPa, an elongation at break ≥400%, a biodegradation rate ≥70% after 6 months, a far-infrared emissivity ≥0.90, and a negative ion release ≥1200 ions / cm³. After 6~9 months of field use, it disintegrates, and the residual minerals continuously regulate soil pH, release trace elements, and improve the aggregate structure, achieving a virtuous cycle of mulch film degradation and soil improvement.

The utility model relates to the technical field of planting and cultivating equipment, especially to an adjustable cultivation container for under-forest planting of Sichuan red peony root, comprising: a container body; an adjusting assembly comprising a threaded cylinder body, a discharging disc, a threaded screw rod, a drainage disc, an adjusting handle, a chute and a threaded plug seat; and a nutrition assembly. The utility model has a reasonable structure, and the adjusting assembly can adjust the internal space of the container according to different growth stages of Sichuan red peony root, so as to avoid root crowding and nutrient deficiency, reduce damage caused by traditional transplanting, improve the survival rate, and adapt the adjusting support to complex under-forest topography to ensure the stability of the container. The nutrition assembly can realize water resource recycling, accurately control the soil pH value and nutrient supply, and meet the growth requirements of Sichuan red peony root. The design of the drainage disc and the threaded plug seat can flexibly adjust the drainage efficiency and the aeration property of the container to ensure the health of the root system. The utility model effectively reduces the risk of insect pests and is convenient to operate, reduces the difficulty of planting management, and has high overall practicality and use effect.

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.

This invention discloses a method for preparing an acidic soil conditioner, belonging to the field of soil improvement technology. This method uses dolomite powder, phosphogypsum, and wood ash as core raw materials, without adding any additional components. By precisely controlling the raw material pretreatment parameters, mixing ratios, activation reaction conditions, and post-treatment processes, the prepared acidic soil conditioner can rapidly adjust soil pH, improve soil fertility and water retention capacity, and continuously improve soil physicochemical properties, suitable for various acidic soils (pH 3.5~6.0). The preparation process of this invention is simple, highly controllable, has high raw material utilization, produces no harmful byproducts, and has low preparation costs. The mixing ratio formulas and reaction parameter formulas involved are all independently designed.

This invention discloses a method and application for soil improvement and carbon sequestration enhancement in castor bean cultivation in saline-alkali land, relating to the field of agricultural planting technology. The method includes: planting castor beans in saline-alkali land using an agroforestry model; and spraying exogenous hormones during the seedling, budding, and flowering stages of the castor beans. The exogenous hormones are indoleacetic acid (IAA) or gibberellin, with the IAA and gibberellin spraying concentrations ranging from 50 μM to 200 μM. This method can lower the soil pH in coastal saline-alkali land, improve soil physicochemical properties, and increase soil organic carbon and organic matter content. Simultaneously, it can effectively enhance soil carbon storage, castor bean plant carbon sequestration, and total carbon accumulation. The method has low operating costs, stable improvement effects, and balances the needs of land use and ecological carbon sequestration improvement in saline-alkali land, providing a theoretical basis and technical support for enhancing soil carbon sequestration in coastal saline-alkali land.

This invention discloses a method for the simultaneous remediation of pesticide and arsenic pollution in acidic soil, belonging to the field of soil remediation technology. *Pseudomonas arsenicoxydans* Y24-2 is used as the remediation microbial agent, and calcium peroxide is used as remediation agent A. Sodium acetate, urea, potassium dihydrogen phosphate, manganese salt, and ferrous salt are mixed to obtain remediation agent B. Remediation agents A and B must be stored separately and mixed immediately before remediation. Remediation agents A and B are dispersed in water, and the remediation microbial agent is added to obtain a remediation agent suspension. The remediation agent suspension is immediately applied to the acidic soil to be remediated for simultaneous remediation of pesticide and arsenic pollution. According to experiments, after remediation using the method provided by this invention, glyphosate in the soil is effectively degraded, arsenic is effectively oxidized and passivated, and the soil pH value is raised to neutral, achieving the goal of pollutant removal and soil restoration to health.

The application discloses a saline-alkali soil conditioner suitable for soybean cultivation and an application method thereof. The conditioner is composed of 70% of rotten cow manure, 25% of superphosphoric acid calcium, 5% of ferrous sulfate and 1000 ppm of ammonium molybdate. Through the synergistic effect of "organic fertilization + inorganic salt adjustment + micro-fertilizer synergism", the problems of poor structure, high salt content, strong alkalinity, low fertility and serious nutrient deficiency of the saline-alkali soil are solved simultaneously. In the preparation, the dry-wet mixing combination and medium-temperature fermentation process are adopted, and in the application, the conditioner is applied in stages according to the degree of salinization (0.2-0.6% of the adding amount), and is matched with rotary tillage and water management. The experiment shows that after the application, the soil pH is reduced to 7.0-7.7, the effective molybdenum is increased by 3.5 times, the soybean emergence rate is increased by 22%, and the biomass is increased by 35%. The application is especially suitable for soybean planting in the coastal saline-alkali land with pH of 8.0-9.5, and realizes the synergistic optimization of soil improvement and crop growth.

This invention discloses *Paenibacillus alvei* CHWJ-P3 for dissolving phosphorus and potassium in acidic soils and its applications. *Paenibacillus alvei* CHWJ-P3 is classified as *Paenibacillus alvei* CHWJ-P3 and was deposited at the China Center for Type Culture Collection (CCTCC) on December 8, 2025, with accession number CCTCC NO: M 20252813. The *Paenibacillus alvei* CHWJ-P3 of this invention exhibits a significant ability to dissolve phosphorus and potassium in the environment, along with high acid resistance and efficient pH regulation. It can be used for the release of insoluble phosphorus and potassium in soil, i.e., the bioremediation of phosphorus and potassium dissolution in acidic soils; and for the bioremediation of acidic soil pH regulation. It features high remediation efficiency, stable remediation effects, and no secondary pollution, demonstrating promising application prospects.

This invention provides an acid- and alkali-producing bacterial combination, a compound bacterial agent, and their applications, belonging to the field of microbial technology. This invention provides a bacterial combination including Bacillus subtilis with accession number CGMCC No. 29201. Bacillus sp S1 and Arthrobacterium with accession number CGMCC No. 29202 ( Arthrobacter sp S2. In this invention, both Bacillus S1 and Arthrobacter S2 are acid- and alkali-producing strains with strong environmental adaptability. Through synergistic effects via multiple pathways, including ammonia production, bicarbonate secretion, and activation of soil enzymes, the bacterial combination can significantly increase soil pH, reduce exchangeable aluminum and hydrolyzable acids, and simultaneously increase soil bicarbonate content, thus rapidly and comprehensively improving soil acidity from its root cause. This bacterial combination is of great significance for achieving green, efficient, and sustainable remediation of acidified soils.

This invention discloses a method for improving tropical acidic soil based on deep tillage and synergistic use of alkaline materials, belonging to the field of agricultural soil improvement technology. This method targets strongly acidic paddy soils or dryland soils with an initial pH ≤ 5.0, and includes: deep tillage to a depth of 35-45 cm at a soil moisture content of 15%-20%, with complete return of crushed straw to the field; uniform application of a compound conditioner on the surface, consisting of: 80-120 kg / mu of quicklime, 80-120 kg / mu of biomass ash, and 150-250 kg / mu of calcium-magnesium soil conditioner, wherein the biomass ash is a byproduct of a biomass power plant, and the pH value is 9-10 under a water-to-soil ratio of 1:2.5; and rotary tillage to ensure that the coefficient of variation of the material distribution within the 0-20 cm soil layer is ≤ 12%. This invention utilizes deep tillage and the synergistic effect of three materials in a specific ratio to form a three-level buffer system of "rapid-release-long-lasting effect," achieving rapid improvement and long-term stability of soil pH. It solves the problems of soil compaction and short-lasting effect caused by the application of lime alone, while effectively alleviating deep acidification. It is particularly suitable for strongly acidic paddy soils or dryland soils with an initial pH ≤ 5.0.

This invention relates to the field of agricultural environmental materials technology, and in particular to a salt-tolerant plant-based biochar soil conditioner and its preparation method. The conditioner uses salt-tolerant plant *Ilex chinensis* as the biochar raw material, which is prepared by compounding with porous mineral carrier diatomaceous earth and modifying with chitosan solution. The preparation method includes: washing, desalinating, drying, and pulverizing *Ilex chinensis*, followed by pyrolysis under limited oxygen conditions to obtain a biochar matrix; mixing the biochar and diatomaceous earth in a certain mass ratio, and achieving mechanical dispersion by wet ball milling; impregnating with chitosan acetic acid solution; and finally, separating the solid and liquid, drying, and solidifying to obtain a powdered product. This invention can effectively reduce soil pH and electrical conductivity, increase organic matter content, and significantly promote crop growth. It has the advantages of readily available raw materials, simple process, and long-lasting improvement effect, and is suitable for ecological restoration and agricultural utilization of coastal saline-alkali land.

The application discloses a coastal saline-alkali land garden plant adaptability intelligent configuration design method and system, the data acquisition module is used for collecting soil conductivity, soil pH, soil moisture content, soil organic matter content, microtopography elevation data and groundwater depth data; the cloud platform processing module is used for constructing a plant ecological niche parameter library, and calculating a plant adaptability index based on the soil conductivity, the soil pH, the soil moisture content and the soil organic matter content; the intelligent configuration module is used for taking a landscape diversity index, an ecological stability index and an economic cost index as optimization targets, and generating a plant configuration scheme by using a non-dominated sorting genetic algorithm; and the user interaction module is used for displaying the plant configuration scheme and a three-dimensional visual model.

This invention relates to the field of saline-alkali land amendment technology. The invention provides a saline-alkali land amendment, its preparation method, and its application. The saline-alkali land amendment comprises the following raw materials in parts by weight: 50-60 parts of straw and livestock manure compost, 30-40 parts of lignite powder, 2-4 parts of desulfurized gypsum, 2-4 parts of citric acid gypsum, 3-4 parts of superphosphate, 3-4 parts of γ-polyglutamic acid, and 1-2 parts of a compound microbial agent solution. This invention effectively increases the organic carbon content of saline-alkali land and improves soil aggregate structure by introducing manure-based and mineral-based organic fertilizers; it enhances the calcium-increasing and sodium-removing effects of desulfurized gypsum, citric acid gypsum, and superphosphate; it introduces γ-polyglutamic acid, which has strong water retention and ion chelating capabilities, effectively fixing salts; and it introduces a compound microbial agent that not only regulates the microbial community composition of saline-alkali land but also produces acid to regulate soil pH and activate fixed phosphorus in the soil.

This invention discloses a green and ecological planting method for daylilies, belonging to the field of agricultural planting technology. It addresses the technical problems of excessive reliance on chemical fertilizers and traditional mulching in current daylily cultivation, leading to soil ecological imbalance and low fertilizer utilization. The method includes: applying organic fertilizer made from cow and sheep manure and Asteraceae plant residues through aerobic composting, using a layered strip application method. First, fully decomposed organic fertilizer is applied as a base fertilizer layer in the planting furrow, followed by semi-decomposed organic fertilizer that has completed the main fermentation stage but not the later aging stage as a middle layer fertilizer; after land preparation and ridging, wood ash is spread on the ridge surface, followed by the laying of black fully biodegradable mulch film; finally, holes are made in the mulch film for daylily seedling planting. This method is mainly used for sustainable ecological planting of daylilies, improving soil fertility and structure, regulating soil pH and providing potassium, conserving moisture and suppressing weeds while avoiding residual pollution, thereby increasing daylily yield and quality while reducing environmental impact.

This invention discloses a pH-responsive soil heavy metal passivating agent and its preparation method. The passivating agent is a carbon nanowire / iron nanoparticle composite material, prepared by polyamide coating of an iron-based material followed by solution spinning and microwave carbonization. The composite material has a one-dimensional nanowire structure and its surface is grafted with acid-base functional groups. The passivating agent can dynamically respond to changes in soil pH and is compatible with both anionic and cationic heavy metal ions. Through adsorption and co-precipitation with metals, it converts active heavy metals into stable states and remains dormant when the heavy metals are in a stable state. The passivating agent of this invention can dynamically respond to soil pH and is compatible with cationic heavy metals in acidic soils and anionic heavy metals in alkaline soils, solving the problems of narrow adaptability and poor passivation specificity of traditional passivating agents. It has excellent passivation effects on various heavy metals such as mercury and cadmium.

The application belongs to the technical field of agricultural resources and environment, and particularly relates to a compound fertilizer for acid soil and a preparation method thereof, wherein the compound fertilizer is a compound particle with a double-layer structure; the compound particle comprises a core and a shell coated on the outer surface of the core; the core comprises chemical fertilizer, potassium-mineral fulvic acid and a first binder; and the shell comprises alkali lignin, potassium humate and a second binder; after the compound fertilizer is applied to acid soil, alkali lignin and potassium humate in the shell can rapidly react with hydrogen ions in the soil, are dissolved and form organic-inorganic composite colloid rich in functional groups such as carboxyl and phenolic hydroxyl groups, so that the soil pH value can be effectively improved and stabilized; relying on the physical barrier of the shell and the ion exchange and complex adsorption of the new colloid, the fixation of phosphorus and the leaching loss of nitrogen and potassium can be significantly reduced, the soil aggregate structure can be promoted, and long-acting fertilizer preservation and buffering capacity can be provided.

This invention belongs to the field of soil conditioner technology, and relates to an organic-inorganic coupled conditioner for improving soda saline-alkali land and its preparation method. The inorganic particles are composed of a mixture of activated polyaluminum ferric sulfate, activated zeolite powder, transcrystalline gypsum, trace elements, and reinforcing agents. The organic slurry is homogenized from activated humic acid extract, modified lignin sulfonate, functional biochar complex, and polyglutamic acid concentrate, and then subjected to spray granulation and high-temperature, high-humidity aging to achieve chemical cross-linking at the organic-inorganic interface, forming a stable three-dimensional network structure. The resulting conditioner integrates chemical exchange, physical adsorption, organic complexation, and biostimulation, and can rapidly reduce soil pH and alkalinity, improve soil aggregate structure, enhance nutrient retention capacity, and has a long-lasting effect and is environmentally friendly, making it suitable for the comprehensive management of soda saline-alkali land.

This invention provides a composite conditioner, its preparation method, and its application. The composite conditioner comprises, by weight, 50-70 parts of low-fluoride phosphogypsum, 20-30 parts of sludge biochar, and 1-3 parts of alkaline solid waste; wherein the low-fluoride phosphogypsum has fluorine, phosphorus, arsenic, and lead contents of less than 10 mg / L, 0.5 mg / L, 1 mg / L, and 1 mg / L, respectively, and the alkaline solid waste includes carbide slag and blast furnace slag. By utilizing the porous structure of biochar as a supporting framework, the low-fluoride phosphogypsum provides precipitation sites for nutrients such as phosphorus and heavy metals, while the alkaline solid waste neutralizes acidity and stabilizes fluorine and heavy metals. The three components form a stable composite through physicochemical synergy, and the use of industrial solid waste as the main raw material reduces production costs. Ultimately, this method achieves simultaneous, efficient, and long-term regulation of multiple targets, including soil pH, salinity, key nutrients, and heavy metal pollution, providing a more scientific, economical, and feasible solution for the systematic remediation and soil fertility improvement of complex degraded soils.

The application discloses a rat and termite prevention cable sheath material with a repairing function and a preparation method thereof, and relates to the technical field of high polymer materials for wires and cables.The application is characterized in that pH-sensitive tannic acid capsules and starch enzyme-specific degradation cross-linking accelerator capsules are cooperatively designed, so that the repairing system triggers the release of the core material and the complete repairing reaction simultaneously only in the specific scenario of rat and termite biting and saliva release, completely avoids the false triggering of non-target scenarios such as soil pH fluctuation and conventional mechanical scratches, and solves the core defects of the early loss of the core material of the traditional self-repairing system and the premature failure of the function. 3+ The application adopts a hierarchical progressive repairing path, realizes instant physical plugging of the damaged area through the rapid action of tannic acid and saliva mucin first, and then completes the transition from temporary plugging to permanent structure repairing through the multiple coordination cross-linking of Fe 3+ ions to build a dense three-dimensional network structure, and the mechanical property retention rate of the repairing area is excellent.

The application discloses a kind of microplastic release amount prediction methods based on mulch aging characteristics and soil physicochemical properties, belong to environmental science and pollution control technical field.The method is by collecting mulch material type, oxygen-carbon ratio, carbon content, haze, light transmittance and soil pH, conductivity, total iron, total manganese, organic matter and so on multiple input variables, with microplastic release abundance as output variable, the nonlinear mapping relationship between input and output is established using random forest regression model, realize the high-precision prediction of microplastic release abundance.The test set is verified, and the model determination coefficient R² can reach more than 0.86.The application can also identify key control factors through feature importance and SHAP analysis, has the advantages of high prediction accuracy, strong interpretability, can handle multi-factor nonlinear coupling relationship, can provide effective tools for agricultural mulch source microplastic formation end evaluation, parameter extraction and environmental management.

The application belongs to the field of microbial fertilizers, and particularly relates to a preparation method of a long-acting biofertilizer containing a DSE strain. The DSE strain has a preservation number of CGMCC No. 42008, a preservation date of May 19, 2025, a classification name of Paraphoma pye, and a name of HQ-21. The long-acting biofertilizer comprises a core layer and a shell layer. The core layer comprises trehalose, a slow-release carrier and the DSE strain. The slow-release carrier is a carboxymethyl cellulose-xanthan gum composite matrix, and the slow-release carrier is loaded with calcium ions and magnesium ions. The shell layer comprises a pH-responsive chitosan / calcium pectate film, PLA-coated ammonium dihydrogen phosphate microspheres and humic acid nanoparticles. The long-acting biofertilizer solves the technical problem that the current DSE is susceptible to soil pH, water, ultraviolet rays and the like, is difficult to survive, and cannot long-term colonize to exert the growth-promoting effect in the application of soil improvement, degraded soil repair and crop growth promotion.

This invention relates to a system and method for evaluating the quality grade of naturally selenium-rich land. The system includes: a data acquisition and analysis module for acquiring multi-source data of the area to be evaluated; a selenium-rich land discrimination module for determining whether land is naturally selenium-rich based on total selenium content and soil pH value; a comprehensive evaluation index module for constructing a comprehensive evaluation index system; a weight determination module for calculating the weight of each evaluation index in the comprehensive evaluation index system; a quality grade calculation module for calculating the membership degree of evaluation indicators at each index layer in the comprehensive evaluation index module; a grade division module for calculating the comprehensive quality index of each evaluation unit using an additive method; and a visualization module for integrating the evaluation thematic map with the geographic base map to obtain a quality grade evaluation map. This invention enables quantitative model calculation and spatial visualization representation of the quality grade of naturally selenium-rich land.

This invention proposes a passivation remediation agent for arsenic-contaminated soil and its application. The passivation remediation agent constructs a ternary synergistic remediation system of zero-valent iron, phosphate, and dithiocarbamate through multi-component synergistic action, mainly including four core mechanisms: redox-adsorption-precipitation-chelation. Simultaneously, biochar, as a carrier, can reduce the risk of zero-valent iron agglomeration and deactivation, maintaining its high reactivity and significantly improving arsenic fixation efficiency. The introduction of dithiocarbamate can fill the gap in the insufficient fixation capacity of traditional iron-based materials for As(III). The calcium phosphate and magnesium phosphate used in this invention hydrolyze in the soil, adjusting the soil pH to a neutral or slightly alkaline range, reducing the solubility of arsenic. The positively charged surface of the iron oxide further facilitates the fixation of negatively charged AsO4. 3‑ Adsorption occurs. Furthermore, the alkaline properties of biochar further enhance this effect.

The present application relates to the technical field of wheat seed seedling raising, in particular to a kind of saline-alkali soil wheat seed seedling raising method, comprising the following steps: by deep ploughing and soil amendment are applied to improve soil structure;Organic fertilizer and vermiculite are mixed, and seedbed is laid, and microbial inoculum is applied by spraying;Wheat seed is soaked with gibberellin and betaine, and then dried for standby;Sowing is carried out using strip sowing mode;After sowing, cover a layer of thin soil, and lay a layer of rice straw on soil surface to keep moisture;Immediately after sowing, water is poured to ensure soil moisture;Wheat field management is watered and topdressed.The present application adds glycollic anhydride, which can improve the hydrophilicity of humic acid, thereby enhancing the water-retaining capacity of soil, providing a more suitable moisture environment for wheat seeds;In addition, glycollic anhydride helps to regulate soil pH, reduce the alkalinity of saline-alkali soil, promote soil to form granular structure, improve aeration and water permeability, which is conducive to the growth of wheat root system.