238 results about "Soil pH" patented technology

The invention discloses a method and system for evaluating the influence of long-term fertilization on rice field soil heavy metals, and the method comprises the steps: obtaining rice field soil data through a sensor, and obtaining a standardized soil physicochemical property data set and a heavy metal content data set; according to the standardized soil physicochemical property data set and the heavy metal content data set, obtaining a feature vector set reflecting correlation between soil physicochemical properties and heavy metal behaviors; aiming at the feature vector set, obtaining a prediction model for representing the influence of the fertilization mode on the heavy metal mobility; if the heavy metal effective state content output by the prediction model exceeds a preset bioavailability threshold value, classifying the soil physicochemical property data set, judging the influence weight of the soil pH value and the organic matter content on the cadmium mobility, and obtaining the classified soil environment risk grade; and according to the classified soil environment risk levels, obtaining comprehensive rice field soil heavy metal pollution evaluation indexes. The pertinence and effectiveness of pollution control are remarkably improved.

The invention relates to the technical field of garden landscape design, in particular to a garden landscape design method based on a virtual reality technology, which comprises the following steps: step 1, multi-source data acquisition and three-dimensional modeling: adopting a laser radar to scan a design site to obtain high-precision terrain point cloud data and generate a three-dimensional terrain model, the method comprises the following steps: performing three-dimensional scanning on garden plants to construct a plant resource library containing plant morphological parameters, growth characteristics and a growth cycle algorithm, acquiring ecological data of field illumination intensity, soil pH value, annual precipitation and wind direction and wind speed through a sensor array, and establishing a field ecological parameter database; and 2, constructing an immersive virtual scene: importing the terrain model into a VR engine, and automatically generating a basic landform based on an ecological parameter database, and through growth simulation and space-time rendering, realizing full-cycle presentation from short-term landscape to long-term ecological change, improving the customer scheme recognition degree to more than 90%, and reducing the modification rate by 60%.

The invention provides a soil health evaluation method. The method comprises the following steps: acquiring community characteristics of soil arthropods of to-be-evaluated soil; the soil arthropods are selected from at least one of diptera arthropods, arthropods of arachnids, coleoptera arthropods, hymenoptera arthropods and lepidoptera arthropods; the community characteristics comprise species composition and relative abundance of species; predicting soil indexes according to the community characteristics; the soil index is selected from at least one of a soil physicochemical index, a soil degradation index and a soil health index; the soil physical and chemical indexes are soil pH, soil total carbon, soil organic carbon and soil total nitrogen; the soil degradation indexes comprise a soil pH degradation index, a soil total carbon degradation index, a soil organic carbon degradation index and a soil total nitrogen degradation index; the soil health index is determined based on soil pH, soil microbial biomass nitrogen, soil respiration rate, soil total carbon, soil organic carbon, soil total nitrogen and soil bulk density; and performing soil health evaluation based on the soil indexes.

The invention provides a wetland ecological restoration effect comprehensive evaluation method and system, and belongs to the technical field of big data analysis. According to the method, real-time data of multi-dimensional ecological elements such as water turbidity, vegetation coverage density and soil acidity and alkalinity are collected, a multi-dimensional element correlation matrix based on time sequence correlation is constructed, and the dynamic change frequency of each element is captured. Core influence factors are screened by quantifying the contribution degree of each element to ecological restoration, weight distribution corresponding to clustered element clusters is determined, and then an accurate quantitative score is generated and mapped into a clear restoration condition level through multiplication and summation of inter-cluster correlation coefficients and weights item by item. Meanwhile, an evolution track is compared and analyzed by combining historical time sequence data, and the weight is dynamically adjusted to ensure that evaluation adapts to an actual repair process. The comprehensive, dynamic and accurate evaluation of the wetland ecological restoration effect is realized, scientific support is provided for the accurate adjustment of the restoration strategy, and the fine management of the wetland and the sustainable development of the natural environment are guaranteed.

The invention belongs to the field of edible fungus culture, and particularly relates to a method for reducing disease occurrence and increasing the yield of dictyophora rubrovolvata. According to the method, before planting, a rotary cultivator is used for ploughing soil, wood vinegar is sprayed, temperature and humidity are controlled after hyphae are put on the soil, wood vinegar is sprayed in the growth stage of bamboo eggs, and temperature and humidity are controlled until harvesting, so that the occurrence of diseases is reduced, and the yield of dictyophora rubrovolvata is increased. The invention provides a method for reducing diseases and increasing the yield of dictyophora rubrovolvata through measures of improving the pH value of soil, preventing soil caking, stimulating rapid growth of hyphae, stimulating twisting of the hyphae, reducing diseases and insect pests and the like. By means of the method, use of pesticides in the dictyophora rubrovolvata planting process can be reduced, the yield of dictyophora rubrovolvata is increased, and dictyophora rubrovolvata diseases are reduced.

This invention discloses a soil improvement and fertilization fertilizer for rhizosphere micro-domains in saline-alkali land and its preparation method, belonging to the field of saline-alkali land management technology. The fertilizer consists of a microbial core, a slow-release fertilizer sub-outer layer, and a soil conditioner outer layer. The microbial core is composed of a compound microbial agent (composed of nitrogen-fixing bacteria, phosphate-solubilizing bacteria, and potassium-active bacteria), biochar, and a high-molecular organic membrane material. The slow-release fertilizer sub-outer layer is composed of chemical fertilizers, inhibitors (nitrification inhibitors and / or urease inhibitors), and amino acids. The soil conditioner outer layer is composed of a soil conditioner specifically for saline-alkali land improvement. The advantages of this invention are: (1) it first adjusts the soil pH and improves the soil structure, so that the microbial community can better adapt to the soil environment of saline-alkali land; (2) the biochar and the isolation membrane effectively protect the microbial activity, and release the microorganisms when the soil pH and base ions around the rhizosphere reach a low level, overcoming the saline-alkali barrier to microbial growth.

The application discloses a soil modifier for saline-alkali soil based on biochar and application, and belongs to the technical field of saline-alkali soil improvement. The soil modifier is composed of the following components in parts by weight: 40-45 parts of saline-alkali improvement biochar, 18-20 parts of mature organic fertilizer, 4-5 parts of water-retaining agent and 4-5 parts of saline-alkali resistant microbial gel beads; the saline-alkali improvement biochar is prepared from biochar material through pyrolysis, nano solution soaking and composite enzyme solution crosslinking; and the saline-alkali resistant microbial gel beads are prepared by mixing microbial liquid and embedding liquid and then dropping into a calcium chloride solution. The soil modifier prepared by the application has a remarkable effect on soil salt removal and soil pH value improvement, and can be applied in secondary saline-alkali soil in irrigated agricultural areas.

The invention discloses a cultivated land soil pH estimation method based on multi-source remote sensing and spatial weighting, which comprehensively utilizes multi-source remote sensing environment information such as optics, radar, terrain, weather and the like, constructs multi-source remote sensing environment factor data, and improves response sensitivity to cultivated land soil pH change. A space weighting mechanism is introduced based on latitude and longitude coordinates of each sampling point, so that the adaptability of the model to cultivated land space heterogeneity is enhanced; the weighted random forest model constructed by taking the enhanced feature matrix as the input of the random forest model improves the spatial continuity and prediction precision of the cultivated land soil pH estimation result; the method disclosed by the invention has good universality and expandability, and is suitable for rapidly estimating the pH of the cultivated land soil in multiple regions and multiple scales.

A method for improving saline-alkaline soil using Salvia miltiorrhiza combined with biochar, comprising the following steps: S1. Soil preparation: applying harmless treatment organic fertilizer as a base fertilizer, evenly applying biochar according to a proportion, plowing and tilling the soil, and, according to planting density and topographical conditions, planning ridge spacing and ridge width of double high ridges; S2. Salvia miltiorrhiza planting: performing Salvia miltiorrhiza seedling transplantation using a seedling transplantation method and hole planting means, digging holes on ridge surfaces, trimming overly long parts of seedling roots, planting seedlings vertically, and covering with soil; S3. field management after transplanting: performing fertilization, weeding, and top dressing management. The present method for improving saline-alkaline soil using Salvia miltiorrhiza cultivation combined with biochar application reduces soil pH and total salt content, increases soil sucrose enzyme activity, increases soil alkaline phosphatase activity, and alters soil microbiome structure.

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.

The invention provides a sustained-release and controlled-release sugarcane bacteriostatic pesticide-fertilizer particle and a preparation method and application thereof, and belongs to the technical field of agricultural sustained-release and controlled-release fertilizer.The pesticide-fertilizer particle is coated with chitosan-sodium alginate double-network hydrogel, has the pH intelligent response characteristic and can adjust the nutrient and bactericide release rate in a self-adaptive mode according to the soil pH change; oxathiapiprolin and pyraclostrobin are compounded, so that sugarcane smut, maculopathy and rust disease are prevented and treated in a broad-spectrum and high-efficiency manner; a biomass charcoal-bentonite-zeolite molecular sieve composite carrier and a bacillus amyloliquefaciens composite flora are introduced, so that the micro-ecology of the soil is improved; a three-layer coating structure simplifies the preparation process, the production cost is reduced, and field tests show that the pesticide-fertilizer particles provided by the invention can increase the yield of sugarcane by 12-18%, increase the sugar content by 0.5-1.2%, reduce the disease incidence by 70-80%, increase the nutrient utilization rate by 20-35%, and increase the soil organic matter content by 0.6-4.6 g / kg.

The invention discloses a method for carrying out mine and ecology integrated restoration by using a specific microbial community. The method comprises the following steps: step 1, directional construction of the microbial community; step 2, preparation of a restoration matrix; step 3, construction of a ternary interaction system; through the synergistic effect of the compound microbial community, the soil pH adjusting period is effectively shortened, the bio-availability of heavy metals is synchronously reduced, the vegetation coverage rate and the organic matter content of a remediation area are both increased through the microorganism-plant-matrix ternary interaction, a stable and balanced ecological system is formed, and the remediation effect is improved. And meanwhile, the manual intervention frequency is reduced through the dynamic regulation and control system, the intelligent degree is high, the integrated restoration cost is greatly reduced, and the system has the characteristics of high efficiency, sustainability and intelligence and is suitable for ecological restoration of various mining wastelands.

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 provides an acid soil improvement method, comprising the following steps: step one, measuring soil pH, mixing the soil sample to be measured with carbon dioxide-free water, stirring and standing until precipitation, and then measuring the pH of the supernatant by using a pH meter; step two, determining the amount of the improvement agent, pre-setting the soil pH, and determining the application amount of any one of Ca(OH)2, CaO and CaCO3 according to a calculation formula; and step three, an application method, crushing lime, sieving, uniformly spreading on the surface of soil, and then rotary tilling the soil to fully mix the lime with the soil; the application only needs to measure one index of soil basic pH, and then the required application amount of lime can be obtained by substituting the pre-set target pH into the formula; the application is accurate, scientific, efficient, convenient and economical; and the lime should be applied once every 2-3 years to achieve the purpose of long-term improvement of acidification of red soil.

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.

The biochar landfill device comprises a base and a supporting frame, the side face of the supporting frame is fixedly connected with a discharging pipe, the discharging pipe is slidably connected with a material blocking toothed plate, the material blocking toothed plate is in meshed connection with a first gear, and the side face of the first gear is fixedly connected with an eccentric wheel; through linkage of structures such as a first gear, the eccentric wheel and the convex column, the depth of the plowing machine is in nonlinear change along with the discharging amount of the biochar, and the situation that the pH value of soil is suddenly changed due to local excess during manual spreading, and microelement absorption of corn roots is affected is avoided; by means of gear meshing, eccentric rotation and the like, linkage adjustment of the biochar landfill depth and the discharging amount is achieved, workers can complete adjustment of the dosage and the flow speed of biochar in the active area of the corn root system without tedious operation, and the working efficiency is improved. The problem that adjustment by workers is inconvenient during simple mechanical spreading is solved.

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.

The invention belongs to the technical field of camelina sativa planting, and particularly relates to a camelina sativa planting method suitable for being popularized in saline-alkali soil. The invention provides a planting method suitable for popularization of camelina sativa in saline-alkali soil. The planting method comprises the following steps: preparation before camelina sativa planting; seed variety selection; seed treatment: coating the camelina sativa seeds with a saline-alkaline tolerant rhizobium inoculant or a humate solution to obtain coated seeds; sowing the seeds; after sowing, cultivating to obtain camelina sativa plants. According to the planting method, the salt content of the surface layer of the soil can be remarkably reduced, the pH value of the soil is adjusted to be in the suitable range of 6.5-7.5, meanwhile, the germination rate, the seedling rate and the yield of the camelina sativa are increased, operation is easy and convenient, the cost is controllable, and the planting method is suitable for large-scale popularization in moderate and light saline-alkali areas and has wide application prospects. And a feasible technical scheme is provided for efficient utilization of saline-alkali land resources and regional expansion of the camelina sativa industry.

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 invention relates to the technical field of saline-alkali soil improvement and efficient utilization of agricultural resources, in particular to a soda saline-alkali soil water, fertilizer and salt optimization regulation and control technology. Through linkage regulation and control of water, fertilizer and salt, the pH value of soil can be reduced by 0.8-1.5 units, the EC value is reduced by 40%-60%, the nutrient utilization rate is increased by 25% or above, and the contradiction of'fertilizer loss due to salt change and salt accumulation during fertilization 'in the traditional technology is solved; parameters are dynamically adjusted based on real-time monitoring data, compared with empirical regulation, irrigation water is reduced by 30%, the chemical fertilizer dosage is reduced by 20%, and the improvement cost is reduced; the soil conditioner can adapt to different crops such as rice and corn, and is suitable for moderately severe soda saline-alkali soil with the EC value of 4-8 mS / cm, and the yield of the improved crops is increased by 30%-50%.

The invention relates to the field of substation monitoring, in particular to a system for monitoring the state of a substation grounding grid. The system comprises a multi-source data acquisition module, a relay polling unit and a control unit. The multi-source data acquisition module monitors the backflow condition, the electrical integrity, the grounding resistance value of an earth screen, the soil resistivity, the contact voltage, the step voltage data, the corrosion rate of the earth screen, the corrosion amount and the soil PH value; the relay polling unit comprises a relay input control module and a relay output control module, and the relay output control module drives multiple relays to switch test loops according to a fixed sequence; the control unit displays the backflow condition, the electrical integrity, the earth screen grounding resistance value, the soil resistivity, the contact voltage, the step voltage data and the alarm information in real time, displays the earth screen corrosion rate, the corrosion amount and the soil PH value, and is integrated with a central processing unit. The state of the transformer substation grounding grid can be comprehensively and intelligently monitored in real time, and the abnormal trend can be analyzed and early warned.

The invention relates to the technical field of agricultural fertilizers, in particular to a plant nutrition blending liquid fertilizer and a preparation method thereof, and aims to solve the problems that nutrient supply and crop growth period requirements are not matched, the chelating rate of medium trace elements is low, the product stability is poor (layering is easy to occur after standing), the soil adaptability is weak (the pH and fertility of soil cannot be adjusted) and the like in a traditional liquid fertilizer. A basic mother solution in the liquid fertilizer takes IDHA as a chelating agent (the chelating rate is greater than or equal to 90%), and is compounded with a biomass charcoal extract (prepared from wheat straws) and a COemulsion (the carbon release period is 11-15 days), so that basic nutrition and an environment adaptation basis are provided for crops; the growth period targeting sub-agent is customized according to key growth period requirements of different crops; the function strengthening module realizes disease resistance, photosynthesis, quality improvement and the like, and the finally prepared product is suitable for various crops such as corn, rice, azalea, camellia oleifera and wheat and has a wide application prospect.

The invention relates to a broccoli early rice rotation analysis method and system based on multi-source data fusion, electronic equipment and a computer readable storage medium, and the method comprises the steps: obtaining multi-source data of a target field area, and carrying out the preprocessing, positioning and calibration of a field multi-view image and soil PH value detection data; and generating a soil PH value thermodynamic diagram through spatial superposition fusion and an interpolation algorithm. On the basis, a PH stress area is identified, and spatial consistency analysis is carried out on the PH stress area and a chlorophyll content diagram obtained through multispectral image inversion, so that the health degree of the crop root system is evaluated. Then, a growth model with the soil PH value, the root system health degree and the multispectral and thermal infrared image features as input is established, and key parameters such as the plant nitrogen content, the leaf area index and the water stress index are quantitatively inverted by means of the predefined PH-root system-canopy physiological response relation. And finally, quantitative analysis of economic, ecological and agronomic benefits is carried out based on inversion parameters, and a comprehensive crop rotation benefit report is generated.

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.

The invention aims to protect a soil conditioner for extracting magnesium residues from dolomite and a preparation method of the soil conditioner. Residues left after magnesium metal is extracted from dolomite contain medium trace elements such as silicon, calcium, magnesium, iron and the like, and the residues are alkaline. The magnesium refining residues are separately granulated or mixed with dolomite / limestone to be granulated, and the magnesium refining residues are used as a soil conditioner, so that the pH value of soil is increased, the pollution of heavy metal cadmium can be reduced, and a certain yield increasing effect is achieved. According to the method, a large number of by-products generated in the magnesium smelting process are effectively recycled, and the residues are calcined, low in heavy metal content, safe and environmentally friendly. The adopted raw materials are mainly industrial waste residues, the waste residues are zero in cost and only need granulation cost, energy conservation and environmental protection are achieved, the price is greatly reduced, the acceptability of farmers is improved, and wide market space is achieved. Dolomite or limestone is added and forms a long-acting and quick-acting combination with refined magnesium residues, and the long-term soil conditioning effect can be achieved only through one-time application.

The application provides a method for improving continuous cropping obstacle soil and improving quality of Chinese kale, comprising the following steps: selecting Chinese kale obstacle soil for five years, crushing the hardening layer, adjusting the soil pH, ploughing the soil to a depth of 30-40 cm, and layering the soil after 72 h; the soil is divided into two layers, 0-15 cm is the surface layer, and the composite microbial agent and organic-mineral complex are applied to the layer; 15-30 cm is the bottom layer, and the expanded perlite-polyacrylamide-ammonium polyphosphate composite particles are applied to the layer; installing a greenhouse and irrigation supporting facilities in the improved soil area; planting Chinese kale seedlings, irrigating micro-nano bubble water every two days, and removing the Chinese kale after 42 days. Through the synergistic effect of the composite microbial agent, organic-mineral complex and other substances, the soil physical and chemical properties are significantly improved, the growth index of Chinese kale is significantly improved, the SPAD value is increased, and the photosynthetic capacity is enhanced, which shows that the application has a significant promoting effect on the growth of Chinese kale and the repair of continuous cropping obstacle soil.

The invention discloses an electric simulation soil acid-base change experimental device capable of automatically replenishing water, and belongs to the technical field of soil environment simulation experimental equipment. The device comprises a box body, a soil area is arranged in the box body, two sides of the soil area are provided with a limiting chute and an inserted electrode, when the electrode is inserted, a gas cavity is compressed through a polar plate clamping seat, gas is transmitted to a water replenishing device through a gas guide cavity, and a water replenishing pricking needle is triggered to move upwards to pierce into soil and unfold a water guide channel. According to the device, a water supplementing system is started through mechanical linkage of electrode insertion action, closed-loop control is achieved through cooperation of a water level sensor and a controller, and the soil can be automatically and accurately kept in a water-completely-saturated submerging state. The intelligent synchronization of electrochemical acid-base change simulation and moisture real-time compensation is realized, the problems of water replenishing lag, operation disturbance and inaccurate moisture control in a traditional experiment are effectively solved, and the stability, repeatability and automation degree of the experiment are remarkably improved.

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.