152 results about "Soil porosity" patented technology

The invention provides an intelligent irrigation control method and system for a high-standard farmland. The method comprises the following steps: acquiring crop canopy image data and farmland terrain elevation data of different crop planting areas in the high-standard farmland; determining a crop growth stage based on morphological characteristic data in the crop canopy image data, and constructing a soil hydrodynamic simulation model according to a root distribution depth interval and a theoretical water absorption rate coefficient corresponding to the crop growth stage; and based on the farmland terrain elevation data and the soil porosity parameter, generating a soil moisture migration parameter by using a soil hydrodynamic simulation model, generating a pipe network pressure regulation and control instruction in combination with the soil moisture migration parameter and a preset irrigation strategy, and adjusting the water outlet pressure distribution of the intelligent irrigation pipe network according to the pipe network pressure regulation and control instruction. Generating an irrigation control instruction; accurate space-time matching of irrigation of the multi-crop rotation area is achieved, the water utilization efficiency is improved, and the problem of irrigation uniformity at the terrain difference and the rotation boundary is solved.

The invention discloses a soil three-dimensional pore structure feature distribution rule comprehensive index construction method. Relates to the technical field of crossing of soil science and computer technology, in particular to the technical field of analyzing soil three-dimensional pore structure feature distribution rules by constructing comprehensive indexes. According to the method, the three-dimensional pore structure feature distribution rule index is constructed based on the three-dimensional Minkowski functional estimation value, and key parameters such as soil porosity, specific surface area and connectivity can be comprehensively and visually reflected. The method comprises the following steps: obtaining a binarized image and carrying out the preprocessing of the binarized image; cutting the pixel matrix data set to obtain a representative basic volume data set of the soil pore structure; the Minkowski functional estimation value in the three-dimensional space is calculated; analyzing Minkowski functional estimation values on the basis of skewness and kurtosis characteristics in statistics; and based on the pore structure distribution characteristic parameters of different soil types, constructing a three-dimensional pore structure characteristic distribution rule index.

The invention relates to the technical field of soil porosity detection, in particular to a frozen soil parameter detection device which comprises a detection box, a shooting analysis module and a pair of box doors hinged to the front side of the detection box, a round rod is rotatably connected to the inner side of the detection box, and an upper disc is fixedly connected to the outer wall of the round rod. Through the arrangement of the structure, the temperature of a frozen soil sample sampling position is simulated in cooperation with a high and low temperature controller in the box, so that frozen soil samples in the multiple cutting rings can be ejected out and scraped off in a running water mode, the working efficiency is improved, the working efficiency is improved, and the working efficiency is improved. According to the device, the porosity of multiple frozen soil samples can be detected at the same time, the detected cutting ring can be automatically pushed out, the cutting ring with the soil sample to be detected can be pushed into the circular cavity for detection, synchronous detection of the multiple samples can be achieved at the same time, the number of times of opening a door for lofting testing by detection personnel is reduced, and the detection efficiency and accuracy of the device are further improved.

The invention belongs to the technical field of smart agriculture, and relates to a smart agriculture environment data real-time analysis method based on Internet of Things, which comprises the following steps: acquiring soil parameters of a first detection layer and a second detection layer of a farmland soil layer, and calculating a soil porosity compensation coefficient by combining a pressure difference value between the two layers, a soil convection measurement value is generated by combining the temperature difference value between the two layers; matching a preset growth period characteristic database to generate a growth period fingerprint code; constructing a dynamic data matrix containing the temperature gradient and the humidity change rate, giving a weighting coefficient to the time in combination with the growth period fingerprint code, and generating a smooth trend fluctuation curve; generating a three-dimensional imbalance index with economic weight adjustment; and selecting an irrigation mode according to the three-dimensional imbalance index hierarchy, and dynamically adjusting the communication priority of the equipment. According to the method, a hard coding decision-making mechanism which easily ignores market price factors and economic weights is solved, so that a resource allocation strategy deviates from actual benefit requirements.

The invention relates to a fertilizer synergistic composition, a special corn fertilizer and a preparation method thereof, and belongs to the technical field of fertilizers. The fertilizer synergistic composition comprises the following components in percentage by weight: 0.6%-5.0% of polyaspartic acid, 1.2%-4.0% of polyacrylamide, 0.3%-2.0% of a nitrification inhibitor and the balance of zeolite powder. The invention also provides a special corn fertilizer containing the fertilizer synergistic composition. The polyacrylamide in the composition provided by the invention can improve the soil structure, increase the porosity and air permeability of the soil, improve the water retention capacity of the soil and reduce the permeability of the soil, so that the fertility of the soil and the yield of crops are improved. According to the fertilizer synergist, the utilization degree of a fertilizer is increased, the release speed of the fertilizer is controlled, and the fertilizer can act for a long time.

The invention provides a soil conditioner for improving soil hardening and a preparation method thereof, and relates to the technical field of soil conditioning. The soil conditioner is prepared by combining nano silicon dioxide, a straw retting material, a straw composite fermentation material, biochar, a water-retaining agent and modified starch. The straw composite fermented material is prepared by the following steps: crushing straws, mixing with sweet water, stirring, drying, carrying out microwave treatment, mixing with bacillus thuringiensis, fermenting, sterilizing, subsequently adding a composite microbial agent of bacillus subtilis, trichoderma and bacillus mucilaginosus, continuously fermenting, and drying. The modified starch is prepared by semi-gelatinizing corn starch and then carrying out microwave drying and shaping. According to the present invention, the defects in the prior art are overcome, the soil hardening phenomenon can be rapidly improved with the small addition amount, the soil porosity is increased, the activity and the diversity of the soil microorganisms are ensured, and the soil fertility is improved.

The utility model relates to a test device convenient for observing the soil loosening effect of a fertilizer. Comprising at least one cylinder used for containing fertilizer and soil and a detachable funnel screen piece matched with an opening in the top of the cylinder. The detachable upper barrel cover is matched with the opening in the top of the barrel body; the cylinder body is made of a transparent material, and scales convenient for observation are arranged on the outer surface of the transparent cylinder body; the device has the advantages that the change of a flocculation aggregate structure in the soil falling process can be directly observed, meanwhile, the soil porosity can be analyzed by observing the height of a soil column, and the device is reasonable in design, easy to clean and convenient to carry.

The invention provides modified polysiloxane and also provides a preparation method of the modified polysiloxane, and the preparation method comprises the following steps: mixing low-hydrogen-content silicone oil with allyl alcohol polyether and allyl glycidyl ether, heating, adding a catalyst, and carrying out an addition reaction to obtain the modified polysiloxane. The invention also provides an application of the modified polysiloxane as a soil loosening agent, and the modified polysiloxane is used for reducing the soil bulk density and / or increasing the soil porosity, and is also used for improving the water absorption and / or water retention of the soil. By applying the modified polysiloxane soil loosening agent disclosed by the invention, the soil bulk density is effectively reduced, the soil compactness is reduced, and the soil porosity is improved, so that the soil hardening is remarkably improved, the crop growth is promoted, and the modified polysiloxane soil loosening agent is green and safe and has important economic value and environmental significance.

The invention relates to the field of agricultural engineering and crop cultivation, and discloses a cultivation method for improving waterlogging resistance of sugarcane, comprising the following steps: S1, acquiring field data through three-dimensional terrain scanning and soil parameter analysis, and dividing into a high-risk area, a medium-risk area and a low-risk area; s2, a ventilation column device is arranged in the high-risk area, and the gas injection rate is dynamically distributed according to the area risk level; s3, porous material filling and mechanical soil loosening are carried out; s4, constructing an optimization model, and dynamically adjusting the ventilation rate and the drainage rate; s5, according to the output result of the optimization model, ventilation and drainage equipment in different areas are dynamically regulated and controlled; s6, evaluating the porosity and the water content of the soil again after waterlogging is finished, and performing soil covering and supplementary ventilation on the damaged area. Through combination of soil pore optimization and dynamic control, the air permeability and drainage capacity of soil are improved, and the root zone environment is more suitable for waterlogging stress.

According to the preparation method of the special biochar base fertilizer for saline-alkali soil improvement, the porous characteristic of biomass charcoal and the characteristic that wood vinegar can adjust the pH value of soil are utilized, the special biochar base fertilizer for saline-alkali soil improvement is prepared, and the preparation method is simple, low in cost and environmentally friendly; the obtained charcoal-based fertilizer can be used as a soil conditioner for improvement and recovery of large-area saline-alkali soil. When the biochar base fertilizer is used for saline-alkali soil cotton planting, it is found that the stem diameter, plant height and leaf chlorophyll content of cotton are remarkably increased, the pH, conductivity and volume weight of soil are remarkably reduced, and the porosity and saturated water-holding capacity of the soil are remarkably increased; the biochar-based fertilizer has the potential of adjusting the acid-base imbalance of the saline-alkali soil, improving the soil structure, increasing the organic matter content of the soil, improving the soil fertility and increasing the crop yield, and a sustainable, economical and effective solution can be provided for agricultural production.

The utility model provides a fertilizing device for improving barren soil, and relates to the technical field of agricultural machinery. The soil crushing assembly is connected with one end of the first supporting base; the fertilizing assembly is connected with the other end of the first supporting base; one end of the moving assembly is fixedly connected with the bottom face of the first supporting base. Original barren soil is cut and smashed through the soil smashing assembly, the porosity of the soil is increased, the ventilation condition of the soil is improved, growth and development of soil organisms are facilitated, fertilizer is applied to the soil through the fertilizer applying assembly, fertilizer can be applied to the interior of the soil, and the soil can be converted into soil organic matter; the soil porosity is further increased; and the soil ventilation condition is improved.

The invention relates to the technical field of soil improvement, and provides a microbial agent for soil improvement and a preparation method thereof. The microbial agent for soil improvement is prepared from the following components in parts by mass: 30 to 50 parts of modified montmorillonite, 10 to 20 parts of zeolite powder, 10 to 15 parts of peat, 10 to 15 parts of animal waste, 10 to 16 parts of complex microbial inoculants and 10 to 15 parts of super absorbent resin, and a modifier of the modified montmorillonite is a chemical substance containing phosphate radicals. According to the technical scheme, the problem that the soil porosity improving effect of a microbial agent for soil improvement in the related technology is poor is solved.

The invention discloses novel efficient biological cultivation equipment for black land based on earthworm driven inoculation, and designs novel pure-electric-driven unmanned earthworm complex large-field throwing equipment in order to solve the problem that existing throwing machinery for earthworm complexes is lacked. According to the device, mixed liquid acts on materials at the bottom of the material box in a spraying mode, the overhead phenomenon formed in the material box due to adhesion of the materials is avoided, and it is guaranteed that the materials are continuously and fully filled into the discharging mechanism; according to the feeding device with the earthworm feeding hopper and the straw mixture feeding hopper as main components, accurate feeding is achieved under the condition that the reasonable sowing amount is controlled, and the feeding distance and the feeding amount can be controlled according to actual needs. According to the design, the requirement of intelligent agricultural machinery is met, quantitative and damage-free putting of the earthworm complex is met, and a feasible solution is provided for solving the problems of insufficient soil porosity and soil hardening.

A computer-assisted method to monitor soil porosity at a field study site using a portable apparatus, the method including: acquiring a soil sample using a first container; recording a first measurement of a mass and a volume of the soil sample; adding the soil sample to a second container until the soil sample is added in entirety, wherein the second container is pre-filled with a fluid medium, wherein the soil sample is added to the second container without causing soil clustering, and wherein a second measurement of a mass of the second container with the fluid medium is recorded; recording a third measurement of a mass of the second container with the soil sample fully immersed in the fluid medium; calculating a porosity of the soil sample based on the first, second, and third measurements; and providing, at the field study site, the calculated porosity of the soil sample.

The invention belongs to the technical field of loess humidification deformation measurement, and provides a slope protection plant selection method and system based on rainfall infiltration simulation analysis, a rainfall capacity and infiltration depth relational expression is obtained through a simulation test, and a structure correction coefficient is introduced into the relational expression; the structure correction coefficient is a ratio of the infiltration depth determined by considering the void ratio of the soil body to the infiltration depth determined by not considering the void ratio of the soil body under the same infiltration depth; when the slope protection plants are selected, the infiltration depth, the infiltration lower interface and the like can be directly and quickly determined according to the rainfall and the relational expression of the rainfall and the infiltration depth, and powerful reference is provided for selection of the protection plants; the introduction of the structure correction coefficient realizes the consideration of the water absorption of soil particles through a simple calculation method, improves the accuracy of the relationship between the rainfall and the infiltration depth, and is beneficial to the accurate determination of the type of the protection plant.

The invention discloses novel equipment for black land biological cultivation under earthworm-driven inoculation, and designs novel pure-electric-driven unmanned earthworm complex large-field throwing equipment in order to solve the problem that existing throwing machinery for earthworm complexes is lacked. According to the device, high-pressure gas acts on materials at the bottom of the material box, so that the overhead phenomenon formed in the material box due to adhesion of the materials is avoided, and it is guaranteed that the materials are continuously and fully filled into the discharging mechanism; according to the earthworm feeding device, the earthworm feeding box is adopted as a main component of the feeding device, meanwhile, the seeding rate control device is arranged for assistance, accurate feeding is achieved under the condition that the reasonable seeding rate is controlled, and the feeding distance can be controlled according to actual needs. According to the design, the requirement of intelligent agricultural machinery is met, quantitative and damage-free putting of the earthworm complex is met, and a feasible solution is provided for solving the problems of insufficient soil porosity and soil hardening.

The invention provides an improvement method for improving soil porosity of saline-alkali soil, which comprises the following steps: (1) uniformly spreading a saline-alkali soil conditioner on the surface of saline-alkali soil to be improved, and uniformly mixing the saline-alkali soil conditioner with the saline-alkali soil; (2) ploughing the saline-alkali soil to obtain a plough layer; (3) flattening the surface of the saline-alkali soil, and thoroughly watering the saline-alkali soil with water; after watering is conducted for 15-20 days, the saline-alkali soil is turned over again, and a planting layer is obtained; the soil conditioner in the step (1) is prepared from 20 to 30 parts of attapulgite-polyacrylamide, 10 to 30 parts of charcoal, 20 to 30 parts of humic acid and 10 to 20 parts of ardealite. Through the mass ratio of the attapulgite-polyacrylamide to the biochar to the humic acid, the obtained soil conditioner can better repair soil and can better maintain the granular structure of the soil, and the water retention and fertilizer retention effects are achieved.

The invention provides an anti-corrosion liquid film and a planting method for climate intelligent agriculture in a semi-arid windy desert area, and belongs to the technical field of desertification cultivated land control and desertification control. The anti-corrosion liquid film is prepared from humic acid, sodium alginate, carboxymethyl chitosan, polyethylene glycol, guar gum and water. The anti-corrosion liquid film has good anti-corrosion and soil moisture preservation capacity, can promote soil to form aggregates and improve the soil structure, has good film forming performance and tensile strength, is easy to degrade and does not cause pollution to the environment. After previous crops are harvested, fertilization, ridging and grass seed sowing are carried out, then the anti-corrosion liquid film is sprayed, and the crops are planted in spring according to the soil moisture content. By means of the method, the emergence rate and yield of desertification farmland crops can be increased, meanwhile, climate environment changes are effectively coped, the soil organic matter content and the soil porosity are increased, economic benefits can be increased while wind prevention and sand fixation are achieved, and the purposes of improving desertification degradation, recarburizing, fertilizing and disaster prevention and reduction are achieved.

The invention relates to the field of soil porosity measurement, in particular to a forest soil porosity detection device and method. Comprising a workbench, a measuring device body, a sliding plate, a drilling mechanism, a positioning mechanism, a slicking mechanism and a sampling mechanism, through the arrangement of the drilling mechanism, drilling can be conducted on the ground, an air cylinder is started, a semicircular column is driven to move downwards under the action of a clamping assembly, and through the action of the slicking mechanism, the inner wall of a pit can be slicked to be flat, so that the sampling accuracy is improved. The sampling device is simple in structure and convenient to use, surface topsoil can be cleaned through rotation of a cleaning roller brush, the sampling effect can be improved, a clamping assembly continues to move downwards, a T-shaped sliding block, an orientation cylinder and a cutting ring can be driven to move horizontally, and when the T-shaped sliding block moves, the orientation cylinder and the cutting ring can be driven into the inner wall of a soil pit through the cooperation of a transmission assembly, an induction assembly and a soil trimming assembly, so that the sampling effect is improved. The sampling function is achieved, and soil at the end of the cutting ring is flattened under the action of the soil trimming assembly.

The invention provides an ecological slope protection composite structure bearing capacity analysis method which comprises the following steps: collecting the root penetration depth, rhizome diameter, soil porosity and pine pile lateral soil pressure of an aquatic plant through a root growth monitor and a soil pressure sensor, and identifying the change rule of data at different time points; extracting a specific numerical range of root system density change; according to the extracted root density change value range, the strength degree of enhanced cementation of aquatic plant root exudates is identified, the improvement effect of the soil particle cementation degree on the shear strength of the soil body around the pine pile is evaluated, and the speed change rate of rhizome thickening and expanding is determined; according to the obtained optimal combination scheme of the pine pile-aquatic plant composite bearing system, the accuracy of slope protection instability risk point correction is evaluated, and a correction coefficient and a correction period for slope protection bearing capacity calculation are obtained.

The invention provides a method for inhibiting soil acidification and application of protozoa to preparation of biological fertilizer.The method comprises the step that the biological fertilizer containing the protozoa is inoculated into soil, and the protozoa comprises at least one of kidney-shaped worms and ochramydae. By the adoption of the technical scheme, the purpose of rapidly inhibiting soil acidification is achieved, the increase of the organic carbon content of soil can be remarkably promoted, meanwhile, different types of protozoa have different degrees of effects on key nutrient elements such as solid storage nitrogen and phosphorus, and a soil nutrient supply structure is optimized. In the aspect of improving the physical structure of the soil, the life activity of the protozoa can effectively promote the generation of soil aggregates, and the healthy soil structure is remodeled by improving the porosity and air permeability of the soil. In addition, the protozoa can also form a complex interaction network with microorganisms such as bacteria and fungi in soil, so that a microbial metabolic pathway is activated, and the microbial activity is remarkably improved.

The invention relates to the technical field of planting and cultivation, in particular to a double-high-yield cross composite planting method for alfalfa and ryegrass in dry land. The method comprises the following steps that alfalfa and perennial ryegrass are sown in drill, and an alfalfa planting strip and a perennial ryegrass planting strip are perpendicular to each other; wherein the medicago sativa planting strips and the perennial ryegrass planting strips comprise wide rows and narrow rows, and the ratio of the number of the wide rows to the number of the narrow rows is (3-5): 1. Compared with conventional intercropping, the total soil moisture content, the soil bulk density, the soil porosity, the soil saturated water and the field moisture capacity of planting with the method are all increased, and the total yield is also increased by 20.89% compared with that of conventional intercropping. By means of the planting method, the water binding capacity of soil can be improved, water competition among plants is relieved, and water-saving intercropping of double high yields of alfalfa and perennial ryegrass in the dry land is achieved.

The invention discloses a corn drought resistance identification test device and method, and belongs to the field of drought resistance identification. A corn drought resistance identification test device comprises a test box, the interior of the test box is sequentially divided into a low-concentration bin, a medium-concentration bin, a high-concentration bin and a contrast bin through telescopic sleeve plates, and the corn drought resistance identification test device further comprises an agent box fixed to the top of the test box; through the air pressure effect generated by reciprocating motion of the piston plate in the piston box, the liquid dropping speed of penetrating fluid is increased firstly, the situation that the inner wall of a pipeline is attached and blocked is avoided, and liquid circulation is ensured; secondly, in the liquid dropping process, atomizing blades are driven to rotate, so that liquid drops are converted into a finer atomized state, and further fall in a larger range and in a uniform state, the accuracy of a test result is improved, meanwhile, the situation that soil is hardened due to large liquid drops is avoided, the porosity and the air permeability of the soil are ensured, and the soil quality is improved. And the accuracy of a test result is improved.

The invention discloses a soil conditioner based on increasing the water retention capacity of Shajiang black soil and an application method of the soil conditioner, and belongs to the field of soil remediation fertilizers.The soil conditioner is obtained by evenly mixing water-retaining agent powder, organic fertilizer, microbial compound inoculants and corn straw; the water-retaining agent powder and an acrylic monomer generate modified humic acid interpenetrating resin powder through grafting modification of humic acid on acrylic acid, and a nano zeolite adsorbent loaded with nano zero-valent iron is fixed on the surface of the modified humic acid interpenetrating resin; the soil conditioner has the characteristics of long-acting water absorption and water retention, reduction of soil bulk density, improvement of soil porosity, maintenance of redox characteristics of soil, effective reduction of cadmium, and improvement of the slow release property of the fertilizer and the microbial compound inoculant; the organic fertilizer can improve the fertility of the soil; the compound microbial inoculants can improve the disease resistance and yield of crops; corn straw contains abundant nutrient elements and organic matters and is a high-quality organic fertilizer source.

Disclosed in the present invention are a high-pressure jet grouting pile body leakage point detection device and detection method, and an operation method. The detection method comprises: when a high-pressure jet grouting pile starts to construct, as the pile body goes deep into soil, periodically acquiring the soil porosity, the soil particle distribution uniformity, the soil permeability, the soil moisture content, the soil particle size, and the area of the pore structure of the soil, and calculating the impermeability of the soil; acquiring the pore structure of a pile body material, the permeability of the pile body material, the compressive strength of the pile body material, and the corrosion degree of the surface of the pile body, and calculating the impermeability of the pile body material; and acquiring the diameter of the pile body, the length of the pile body, the water flow rate during construction of the high-pressure jet grouting pile, the construction speed of the high-pressure jet grouting pile, a change value of pressure around the pile body as the pile body going deep into the soil, the construction time, the pH value of the soil, the temperature of the soil, and the inclination angle of the pile body, configuring a pile body leakage point detection model on the basis of the impermeability of the soil and the impermeability of the pile body material, and calculating the index of occurrence of the leakage point of the pile body in each period, thus detecting the leakage point of the pile body.

The invention discloses a garden branch decomposition inoculant and a preparation method thereof, and relates to the technical field of garden waste treatment.The garden branch decomposition inoculant is composed of microbial strains, organic matter, inorganic nutrients and adjuvants.The garden branch decomposition inoculant shows excellent performance advantages through unique component combination, and the preparation method is simple. A plurality of microbial strains have a synergistic effect, the bacillus subtilis firstly decomposes protein and starch, the bacillus licheniformis inhibits harmful microorganisms and assists cellulose decomposition, and the sporotrichum thermophilus focuses on overcoming cellulose and lignin, so that the decomposition rate of the branches is greatly increased, and the decomposition rate of the branches is increased. Organic substances and inorganic nutrients provide sufficient and balanced nutrient sources for microorganisms and promote vigorous growth and reproduction of the microorganisms, enzyme and vitamin B are added to further enhance the activity of the microorganisms and accelerate the decomposition process, and after the decomposition agent is applied to soil, the soil structure can be remarkably improved, the soil porosity can be increased, and the soil quality can be improved. The air permeability of the soil is better.

The invention relates to the technical field of improvement of coastal saline-alkali land, in particular to a soil conditioner for salt-control fertile soil of coastal fishery reclamation saline-alkali land and a preparation method of the soil conditioner. The invention relates to a soil conditioner for salt-control fertile soil of coastal fishery receding reclamation saline-alkali land. The soil conditioner comprises the following raw material components in parts by mass: 40-60 parts of urea, 25-45 parts of calcium superphosphate, 30-45 parts of potassium sulfate, 20-25 parts of modified oyster shell powder, 10-15 parts of humic acid, 3-5 parts of a compound microbial agent, 10-20 parts of desulfurized gypsum and 25-35 parts of a biochar composite material, the biochar composite material is prepared from the following raw material components in parts by mass: 1 to 2 parts of sodium alginate, 1 to 2 parts of chitosan, 3 to 8 parts of biochar, 1 to 5 parts of calcium chloride, 10 to 20 parts of tuff stone powder, 0.25 to 2 parts of acidified attapulgite, 0.01 to 0.08 part of graphene oxide, 1 to 5 parts of ferric nitrate, 0.6 to 3 parts of copper nitrate and 0.1 to 0.5 part of silane coupling agent. By adopting the soil conditioner prepared by the invention, the pH value of soil, the volume weight of the soil and the total amount of water-soluble salts can be remarkably reduced, meanwhile, the organic matters of the soil are increased, and the porosity of the soil is increased.

The invention discloses a saline-alkali soil conditioner and a preparation method thereof, and belongs to the technical field of soil conditioners, hydrothermal carbon, ardealite and microbial flora are used as main raw materials and are respectively treated to jointly prepare the conditioner, and the ardealite, the hydrothermal carbon and the microbial flora jointly act to quickly reduce the salinity and alkalinity of soil, so that the saline-alkali soil conditioner has a good application prospect. Meanwhile, the hydrothermal carbon continuously improves physicochemical properties such as soil porosity, fertilizer and water retention capacity and the like, so that the physicochemical properties of the soil are comprehensively improved while rapid treatment of the saline-alkali soil is realized; and the modifier is prepared by compounding the phosphogypsum and the hydrothermal carbon, so that the density of the modifier can be improved, the problem that the acting effect of the modifier is reduced due to the fact that the modifier easily floats upwards due to low density when single hydrothermal carbon is applied is solved, and the prepared modifier has a good application prospect in the technical field of saline-alkali soil improvement.

The invention relates to a microbial exopolysaccharide for reducing soil porosity, a preparation method and application. The preparation method comprises the following steps: (1) inoculating microorganisms into a culture medium A, and culturing to obtain a seed solution; inoculating the seed solution into a culture medium B, culturing to obtain fermentation liquor, centrifuging to obtain fermentation liquor supernate, and performing rotary evaporation concentration to obtain concentrated liquor; (2) mixing the concentrated solution with ethanol, and centrifuging to obtain a polysaccharide precipitate; adding water into the polysaccharide precipitate, stirring and dissolving, dialyzing, and carrying out vacuum freeze drying to obtain crude polysaccharide; and (3) preparing the crude polysaccharide into a crude polysaccharide solution, then performing chromatographic separation, gradient elution and vacuum freeze drying, dialyzing, and then performing freeze drying to obtain the microbial exopolysaccharide. The microbial exopolysaccharide is good in rheological property, high in viscosity, simple to prepare, capable of being produced on a large scale, capable of effectively reducing the porosity of media such as soil and quartz sand and capable of being applied to the field of environmental remediation.

The invention discloses a 220kV submarine cable current-carrying capacity calculation method based on a gap correction factor. The method comprises the following steps: measuring the soil temperature of a cable laying position, measuring the void ratio of soil, measuring the seawater temperature, measuring the seawater flow velocity, calculating the gap correction factor, and calculating the current-carrying capacity of a 220kV submarine cable directly buried and laid under the seabed. The method has the advantages that the current-carrying capacity of the 220kV submarine cable directly buried and laid under the seabed is calculated by measuring the soil temperature, the soil porosity, the seawater temperature and the seawater flow velocity at the cable laying position and calculating the gap correction factor, and the method is simple and efficient and can accurately calculate the current-carrying capacity of the 220kV submarine cable directly buried and laid under the seabed.