185 results about "Water retention (function)" patented technology

The invention relates to the field of agricultural soil improvement and ecological fertilization, and discloses an ecological fertilization method for improving the organic matter content of soil in a dry-hot valley region, and the method comprises the following steps: soil matrix improvement: improving the porosity and water binding capacity of the soil by adding charcoal and humic acid particles; the functional microbial preparation is put, and the activity of soil microorganisms is activated through the combined effect of cellulose decomposition bacteria, stabilization promoting flora and water retention flora; green manure crop planting and covering management: planting sweet clover and other leguminous crops to provide a carbon source and a nitrogen source for soil, and meanwhile, utilizing straw covering to inhibit water evaporation; turning over and stabilizing the green manure crops, namely turning over and stabilizing the organic matters in a blooming period of the green manure crops and combining with a stabilization promoting bacterial liquid and an adsorptive carrier; dynamic balance is maintained, and dynamic balance of decomposition, conversion and accumulation of organic matter is achieved step by step through multi-cycle planting and turning and pressing. The organic matter content and fertility of the soil can be improved, and the water-retaining property and microbial ecosystem of the soil are improved.

The invention relates to the technical field of agricultural water conservancy, and discloses a dynamic regulation and control method for a farmland-irrigation area-drainage basin water conservation and drainage system in a black soil area, which comprises the following steps: S1, collecting basic data including meteorological and hydrological data, irrigation data, environmental data and monitored soil data; s2, analyzing water retention threshold values and soil fitting parameters of the four kinds of soil by applying a naive Bayes method; s3, calculating a function relationship between the water demand and the yield; the soil water retention threshold value serves as input and is input into a management file of a DSSAT model, and the DSSAT model is used for simulating the growth conditions of the four kinds of soil under the condition that multiple crops are planted on the farmland scale; and S4, constructing a dynamic regulation and control framework of a water retention and drainage system of soil-farmland-irrigation area-drainage basin. According to the method, the minimum water retention threshold value and the effective water threshold value of different soil types in the black soil area are quantified, the crop water consumption amount based on the crop growth process is estimated, and a response relation function among soil water, crop water demand and irrigation water is obtained.

The invention discloses a preparation method of an intelligent response type soil conditioner based on a nano composite material, and belongs to the technical field of soil improvement. The modifier is prepared from 10 to 15 parts of modified chitosan, 15 to 25 parts of nano silicon dioxide, 20 to 30 parts of biochar-loaded polyglutamic acid, 8 to 15 parts of humic acid-sodium alginate microcapsules, 3 to 5 parts of trace element slow-release particles, 1 to 2 parts of a pH response type cross-linking agent and 15 to 25 parts of a functional agent. The soil conditioner researched and developed by the invention can flexibly adapt to complex and changeable soil environments, can sensitively sense dynamic changes of key environmental indexes such as soil humidity, pH value and temperature, automatically and accurately regulates and controls the release rate and the action effect of the soil conditioner, realizes multiple functions such as water retention, acid regulation, fertility increase and pollution resistance in a one-stop manner, and has a wide application prospect. High efficiency, long-term effect and ecological environment friendliness of soil improvement are comprehensively achieved, a new road is opened up for global soil improvement, and agricultural yield increase, ecological restoration and urban green development are assisted.

The invention relates to the technical field of land treatment, in particular to an organic fertilizer for improving the soil fertility of a sand land. Comprising the following raw materials in parts by weight: 3-12 parts of a microbial agent, 20-50 parts of volcanic rock, 5-12 parts of an additive, 32-45 parts of sodium bentonite, 12-18 parts of a functional agent, 5-25 parts of a modifier and 15-32 parts of a water retention material. By increasing organic matters in the soil, the viscosity of the soil is improved, the air permeability, water retention and permeability of the soil are improved, the formation of a soil aggregate structure is promoted, and the water and fertilizer retention capability of the sand soil is improved.

The invention provides a method for reconstructing a grouting, water-retaining and water-resisting layer in a mining area and related equipment. Geophysical prospecting is carried out in a coal mining treatment area of a mining area from a water-bearing layer to a goaf, first apparent resistivity of all positions in a space is obtained, and the positions with the first apparent resistivity smaller than or equal to first preset resistivity in the space are selected to form a first dominant water guiding channel area; performing water flow direction testing on at least two monitoring wells in the coal mining treatment area to obtain a first flow direction fitting function of each monitoring well, and selecting two first flow direction fitting functions to calculate a first flow direction intersection point of the two corresponding monitoring wells; and when the first flow direction intersection point is located in the first dominant water guide channel area, grouting operation is conducted on the first dominant water guide channel area. The mining area grouting water-retaining and water-resisting layer reconstruction method and the related equipment provided by the invention are simple and convenient, grouting water retention can be quickly and accurately realized, the cost is low, and the loss of superficial water resources is effectively reduced.

The invention discloses a high-toughness wetland ecological grid structure and a restoration system thereof. The grid structure comprises a plurality of rows of slope fixing grids which extend longitudinally and are arranged at intervals, and the slope fixing grids in the adjacent rows are arranged in a staggered mode; interval zones between the adjacent slope fixing grids form planting base bands which are communicated with each other. The slope fixing grids and the planting base band are made of artificial substrates of a multi-level pore structure, and a plurality of longitudinally-extending artificial waterways are arranged in the planting base band. The staggered ecological grid structure is matched with the wave-shaped artificial waterway to enhance the overall stability and anti-interference capability of the wetland, and the artificial matrix with the multi-level pore structure improves the water retention, filtration and adsorption effects and enhances the hydraulic connectivity of the matrix. According to the remediation system, a grid structure is divided into four planting belts, the remediation system of an arbor-shrub-grass-hygrophilous four-layer three-dimensional community is formed, a functional microorganism-plant combined remediation mechanism is achieved in cooperation with microbial flora, and the remediation adjusting capacity and stability of the wetland are improved.

The invention provides tillage and soil preparation equipment and method for improving the water utilization efficiency, and relates to the technical field of strip tillage and agricultural machinery, in particular to the tillage and soil preparation equipment and method for improving the water utilization efficiency. Therefore, the water utilization efficiency of soil and the yield and quality of crops are remarkably improved, the power consumption of tillage and soil preparation equipment can be reduced, the strip tillage quality and the strip tillage efficiency are improved, and the maintenance cost of machinery is indirectly reduced; the tillage and soil preparation equipment can achieve the integrated functions of straw returning, soil preparation, fertilization, pressing, drip irrigation belt laying, mulching film laying and the like, the tillage depth can be adjusted according to the actual situation, the number of the auxiliary racks can be selected according to the area of a field during tillage, the width can be adjusted by adjusting the width of the strip tillage wheel and the width of the pressing wheel, and the tillage and soil preparation efficiency is improved. And a wide-narrow row farming mode is realized by adjusting the distance between the auxiliary racks according to actual conditions.

The invention belongs to the technical field of soil improvement, and relates to a soil conditioner for improving sandy soil structure and a preparation method thereof, and the preparation method specifically comprises the following steps: preparing activated humic acid, preparing a nano mineral material, preparing modified biochar, constructing biochar composite gel, and preparing konjac glucomannan-sodium alginate water-retaining colloid. Mixing the biochar composite gel, the water-retaining colloid and the slow-release fertilizer, granulating and the like. Through a ternary synergistic system of the biochar composite gel, the water-retaining colloid and the slow-release fertilizer, the functional singleness is broken through, the structure-water retention-fertilizer supply integration is realized, and the problems that an existing sandy soil conditioner is single in function, poor in component synergism, weak in environmental adaptability, insufficient in long-term effect and the like are solved.

The invention relates to the technical field of sand wind protection, in particular to a photovoltaic desertification control ecosystem which comprises a photovoltaic module, a flow guide module, a splash-proof water retention layer and vegetation, and the photovoltaic module comprises a fixing support and a photovoltaic panel arranged on the fixing support; the flow guide assembly is arranged at the lower edge of the photovoltaic panel, and the flow guide assembly is used for collecting water on the photovoltaic panel and enabling the collected water to drop down through the flow guide end; the splash-proof water retention layer is laid on the ground, located below the flow guide assembly and used for receiving water dripped by the flow guide assembly. The vegetation is planted on the land and located below the photovoltaic panel; wherein water received by the splash-proof water retention layer is used for being conveyed to vegetation. The photovoltaic desertification control ecological system provided by the invention can be effectively combined with the photovoltaic module, and the functions of desertification control and ecological restoration are realized on the basis of ensuring the normal operation of the photovoltaic module, so that the collaborative development of clean energy, desertification control and ecological restoration is efficiently promoted.

The invention relates to the technical field of soil improvement, in particular to a soil conditioner for promoting flue-cured tobacco root development and a preparation method thereof, and the soil conditioner is mainly composed of struvite modified biochar, a microbial agent, a microbial protective agent, a carboxyl functionalized polyacrylamide solution and the like. The preparation method comprises the following steps: preparing struvite modified biochar through oxygen-controlled cracking, citric acid activation and chemical reaction, combining the struvite modified biochar with a microbial agent, loading the struvite modified biochar on the surface of the biochar, then mixing the microbial-loaded biochar with a carboxyl-functionalized polyacrylamide solution, adding chitosan, wormcast, humic acid, sodium alginate and plant ash, and granulating and drying to obtain the modifier. The modifier prepared by the invention can significantly improve the physical and chemical properties of soil, provide long-acting nitrogen and phosphorus sources, enhance the water retention capacity of soil, and promote the healthy development of flue-cured tobacco roots.

The invention belongs to the technical field of ecological environmental protection treatment, and provides a biomass fiber planting blanket for mine remediation and a preparation method thereof, the biomass fiber planting blanket sequentially comprises a non-woven fabric layer, a plant fiber layer and a seed matrix layer from top to bottom; the seed matrix layer comprises seeds and a matrix; the plant fiber layer comprises the following raw materials: plant fibers and modified cellulose. The preparation method comprises the following steps: mixing the plant fibers and the modified cellulose according to the weight ratio, carding into a thin fiber web, paving between the non-woven fabric layer and the seed matrix layer, and carrying out compression molding to obtain the biomass fiber planting blanket. According to the biomass fiber planting blanket for mine remediation and the preparation method of the biomass fiber planting blanket, the excellent hydrophilic and water-retaining functions are achieved, the water storage performance of sand can be effectively improved, the acting force among sand grains can be enhanced, and the effects of wind resistance, water retention and fertilizer retention can be achieved in the early stage of plant germination; and the preparation method is simple, efficient and convenient to operate and popularize.

The invention relates to the technical field of fertilizer preparation, in particular to a farmland drought-resisting and water-retaining multifunctional green fertilizer and a preparation method thereof. The farmland drought-resisting and water-retaining multifunctional green fertilizer is prepared from the following components in parts by mass: 40-60 parts of mushroom dregs, 10-20 parts of konjac glucomannan residues, 3-5 parts of a water-retaining agent, 11-15 parts of an NPK compound fertilizer, 4-6 parts of trace elements, 0.4-0.6 part of a fermentation inoculant, 1-2 parts of wormcast, 1-2 parts of humic acid and 0.6-0.8 part of a seaweed extract. The prepared fertilizer can significantly improve the physical structure of soil, enhance the water retention capacity of the soil, promote the growth and development of crop roots, and further improve the drought resistance of crops. In addition, the application of the fertilizer is helpful for reducing the use amount of chemical fertilizers, so that the sustainable development of ecological agriculture is promoted.

The invention discloses a soilless restoration method for a cyanidation tailing reservoir, and relates to the technical field of mine ecological environment restoration and treatment. The remediation method comprises the following steps: laying an artificial improvement material composed of a bio-based modifier, an organic fertilizer and an aggregate accelerator sa-hao seed gum on the cyanidation tailings, and spraying a microbial induced carbonate precipitation bacterial agent on an artificial soil layer, grass seeds are sown on the artificially improved cyanidation tailings in a broadcast sowing mode that mixed grass seeds and microbial agents form seed bags, regular and irregular artificial maintenance is combined, the germination rate and growth vigor of plants are enhanced, and plant covering on the surface layer of a cyanidation tailings library is restored. According to the method, an artificial improvement material and functional microorganism synergistic improvement mode is adopted, waste is treated with waste, the effects of reducing the pH value of the cyanidation tailings, stabilizing heavy metal ions, improving the nutrient content and the water retention capacity and the like are achieved, waste is turned into wealth, the cyanidation tailings are improved into a soil-like matrix suitable for vegetation growth, and the vegetation quality is improved. And soil-free / less-soil repairing of the gold mine cyanidation tailing warehouse is achieved.

The invention relates to the field of soil remediation conditioners, and particularly provides a soil remediation conditioner for durian breeding as well as preparation and application of the soil remediation conditioner. The soil remediation conditioner is prepared from the following components in parts by weight: 35 to 45 parts of organic matter fertilizer, 18 to 22 parts of biochar, 22 to 28 parts of humic acid, 8 to 12 parts of vermiculite, 10 to 14 parts of perlite, 12 to 18 parts of shell powder, 6 to 10 parts of mycorrhizal fungi, EM bacteria and other mixed bacteria, 8 to 12 parts of wormcast, 4 to 6 parts of amino acid chelate solution, 8 to 12 parts of coco coir and 4 to 6 parts of adhesive. The specific surface area of the biochar is 32 m < 2 > / g, and the particle size is 40 meshes; the soil remediation conditioner is applied to durian planting soil remediation, has the effects of improving the physical structure of soil, improving the air permeability and water retention of the soil, increasing the fertility of the soil and providing rich nutrition for breeding and growth of durian seedlings, and has great application potential for the durian industry.

The invention discloses an efficient maintenance method for a cement stabilized macadam base, and relates to the technical field of buildings. According to the efficient maintenance method for the cement stabilized macadam base, the water-retaining property of the covering device is guaranteed through the geotechnical cloth water-retaining layer, so that the covering object is better kept wet in the maintenance process; the cement stabilized macadam base is well prevented from being influenced by water shortage during maintenance due to the toughness and the water conveying capacity of the polyethylene water distribution pipe; the reserved connecting port of the water distribution pipe has the effects of connecting a water supply pipe and connecting a plurality of covering device units, sufficient water maintenance of a cement stabilized macadam base layer in a covering area is guaranteed as far as possible, and meanwhile, the performance of convenient disassembly and assembly provides the effects of being suitable for maintenance of areas with any area and recycling of the device during maintenance of the cement stabilized macadam. Due to the water sealing performance of the polyethylene water sealing layer and the water supplementing holes formed in the water distribution pipe, only a small amount of water in the cement stabilized macadam base is evaporated.

The invention provides a seepage-preventing and water-retaining structure for ecological restoration of an arid mining area in the Yellow River basin and a construction method. The seepage-preventing and water-retaining structure comprises a seepage-preventing layer, a water-retaining layer and an evaporation-preventing layer. The seepage prevention layer is composed of Yellow River silt, bentonite, a base material aggregate agent and an organic material and is laid on the surface of the mine slope; the water retention layer is composed of Yellow River silt, coal gangue, an organic material, an organic fertilizer, a plant growth regulator and a base material composite water retention agent, and is laid on the surface of the permeation prevention layer; the anti-evaporation layer is composed of Yellow River silt, wood fibers, a base material adhesive, a base material composite water-retaining agent and plant seeds and is laid on the surface of the water-retaining layer. The seepage-preventing and water-retaining structure designed by the invention effectively combines three key functions: the seepage-preventing layer effectively prevents water from infiltrating too fast, the water-retaining layer has excellent water-storing and moisture-retaining capabilities, and the evaporation-preventing layer remarkably inhibits water evaporation.

The invention relates to the technical field of soil improvement, and discloses a preparation method of an intelligent controlled-release fertilizer using water to drive an iron switch. The slow / controlled-release fertilizer is of a core-shell structure, the core of the slow / controlled-release fertilizer is a porous carrier loaded with nutrient elements, and the core shell of the slow / controlled-release fertilizer is an iron mineral film layer. According to the slow / controlled-release fertilizer provided by the invention, the nutrient elements are loaded on the porous carrier, then the carrier is coated with the iron mineral film layer, and the slow / controlled-release fertilizer can be combined with soil moisture conditions to induce soil microorganisms to change the pore size of the iron mineral film layer on the surface of a material, so that the release rate of the nutrient elements is regulated and controlled, and the efficient utilization of the nutrient elements is promoted; meanwhile, the porous carrier has the effects of keeping soil moisture and increasing soil pores, so that the sustained and controlled release fertilizer can also optimize the soil structure and enhance the air permeability and water retention of the soil; the slow / controlled-release fertilizer has the advantages of easily available raw materials, low cost, environmental friendliness, simple preparation method, low energy consumption and no generation of solid waste, and is suitable for popularization and application.

The invention discloses an opencast coal mine truck transportation road dust suppressant for a high-temperature dry environment and a preparation method of the opencast coal mine truck transportation road dust suppressant. The dust suppressant is prepared by mixing 20-30% by mass of glucose, 0.05-0.15% by mass of a penetrant, 1.5-2.5% by mass of a water-retaining agent, 1.5-2.5% by mass of a moisture absorbent and the balance of water. The dust suppressant is an environment-friendly material, the main material glucose is a monosaccharide which is most widely distributed and most important in nature, and the dust suppressant has the characteristics of being non-toxic, odorless, green, environment-friendly, wide in source and application and the like. The dust suppressant integrates the functions of wetting, moisture absorption, water retention and the like, can keep dust on a road surface transported by a large mine truck of an open pit coal mine wet and effectively suppress flying dust on the road surface, is simple in preparation process, low in material cost, green and environment-friendly in material and wide in material source, and has good flowability and feasibility. The dust suppressant is applied to the open pit coal mine end slope transportation road, the environment quality and the traffic safety of the open pit coal mine can be effectively guaranteed, and the manpower and material resource investment of environment maintenance is reduced.

The invention provides a construction concrete curing process, which relates to the technical field of building construction, and comprises the following steps: carrying out surface film forming treatment at the initial setting stage of concrete; laying a composite maintenance layer with water retention and reflection functions; the concrete humidity is monitored through an embedded humidity sensor, and humidity data is obtained; controlling a local water supplementing system to operate according to the humidity data; and dynamic temperature regulation is implemented in combination with the environment temperature. Pores in the surface of the concrete are sealed by the water-retaining film layer, so that the problem of early cracking caused by rapid evaporation of water is solved; water is evenly distributed through the composite maintenance layer, local dry-wet difference is eliminated, solar radiation is reflected, the surface temperature is lowered, and temperature stress cracks are reduced. The concrete humidity is monitored through the humidity sensor, water is supplemented according to needs, compared with regular spraying, the use amount of water resources is reduced, and the water saving effect is achieved; and the contradiction that the strength is reduced due to excessive water replenishing or shrinkage is caused due to insufficient water replenishing in traditional curing is also solved.

The invention belongs to the technical field of sandy soil modifying agents, and particularly relates to a sandy soil modifying agent and a sandy soil modifying method. The sandy soil improver comprises a functional bacterium suspension and a cementing liquid, the functional bacteria in the functional bacteria turbid liquid can perform biomimetic mineralization on calcium salt in the cementing liquid to generate inorganic cement calcium carbonate (the crystal form is calcite and / or vaterite), and the inorganic cement is a cementing component widely distributed in natural soil and can maintain high cementing strength and a stable structure of the sandy soil, so that the sand stabilization effect is realized. Secondly, the formed inorganic cement is consolidated on the surface layer of the sandy soil in the form of a crust layer, the main component of the crust layer is calcium carbonate, and the calcium carbonate is white or yellowish white and light in color and can significantly reduce the solar radiation effect, so that the earth surface soil temperature rise speed of the sandy soil is slowed down, the water evaporation is slowed down, the water retention is enhanced, and the drying and hardening of the surface crust layer are slowed down; and germination and growth of plant seeds are facilitated.

The invention relates to the technical field of agricultural fertilizers, in particular to a functional slow-release fertilizer and a preparation method thereof.The functional slow-release fertilizer is prepared from modified chitosan-sodium alginate hydrogel and a fertilizer according to the mass ratio of 1: (60-70); the modified chitosan-sodium alginate hydrogel is prepared by cross-linking modified chitosan and sodium alginate through a cross-linking agent; the structure of the cross-linking agent contains an isocyanate group, and the functionality of the cross-linking agent is not less than 2. The functional slow-release fertilizer has excellent water retention performance and mechanical performance, can improve soil fertility, reduce pathogenic bacteria in soil and improve the soil environment, and is small in environmental pollution.

The application provides a construction concrete curing process and relates to the technical field of building construction, which comprises the following steps: surface film forming treatment is performed in the initial setting stage of the concrete; a composite curing layer with water retention and reflection functions is laid; the humidity of the concrete is monitored through a buried humidity sensor to obtain humidity data; a local water supplement system is controlled to operate according to the humidity data; and dynamic temperature regulation is implemented in combination with the ambient temperature. The water retention film layer seals the surface pores of the concrete, solving the early cracking caused by the rapid evaporation of water. The composite curing layer uniformly distributes water, eliminates the local dry-wet difference, reflects solar radiation, reduces the surface temperature and reduces the temperature stress cracks. The humidity of the concrete is monitored through the humidity sensor, and water is supplemented as needed, which reduces the water resource consumption compared with the timed spraying, achieves the water saving effect, and also solves the contradiction between the strength reduction caused by the excessive water supplement and the shrinkage caused by the insufficient water supplement in the traditional curing.

The invention relates to an improvement method for continuous cropping soil of a rubber garden, and belongs to the technical field of rubber garden soil management. The method comprises the following steps: in a dry season, digging a strip-shaped ditch parallel to a rubber planting belt in the middle of a rubber circular protection belt with the gradient of less than 30 degrees; the depth of the strip-shaped ditches is 50-70 cm, and the width of the strip-shaped ditches is 70-100 cm; applying farmyard manure subjected to stack retting fermentation into the strip-shaped ditches, and applying farmyard manure with the pH value larger than 7 if the soil is slightly acidic; if the soil is slightly alkaline, farmyard manure with the pH value smaller than 7 is applied; the application amount is 19-21 kg / plant; and after fertilization, covering a layer of soil. The method can increase organic matters and nutrient elements of the rubber garden soil, reduce the pH value of the soil, cultivate beneficial microbial flora of the soil, increase contact between soil fertilizer and absorption root systems of rubber trees, improve water retention and fertilizer retention functions of the rubber garden and the like, so that the purposes of improving the quality of the rubber garden soil, keeping healthy growth of the rubber trees and guaranteeing sustainable rubber tapping are achieved.

The invention discloses a bioretention facility dielectric layer suitable for northwest regions and a preparation method, and relates to the technical field of environmental governance. The invention discloses a bioretention facility dielectric layer suitable for northwest regions and a preparation method thereof. The preparation method comprises the following steps: preparing biochar, selecting experimental biochar types, preparing modified biochar, selecting a biochar filling proportion, selecting a biochar filling mode, strengthening the dielectric layer and removing microorganisms. According to the invention, a bioretention facility medium layer suitable for northwest regions is designed, that is, a layered functional medium design is adopted, and a layer of strengthening medium is added on a basic medium, so that low-intervention and high-benefit collaborative purification is realized; special agricultural organic wastes in northwest regions are utilized to prepare biochar, and then the biochar is used for a medium layer of a bioretention facility; the bioretention facility medium layer has the advantages of comprehensive design functions including water retention, drainage and decontamination (nitrogen, phosphorus and microorganisms).

The invention discloses a water-absorbing material for soil water retention and fertilizer self-supply as well as a preparation method and application thereof, and relates to the technical field of soil water retention functional materials and preparation thereof. The water absorbing material is particulate matters with a graded micro-nano structure prepared by reacting natural agricultural and forestry wastes, animal wastes, acrylic acid or derivatives thereof, an initiator, a cross-linking agent and inorganic minerals; the mass ratio of the natural agricultural and forestry waste to the animal waste to the acrylic acid or the derivative thereof to the initiator to the cross-linking agent to the inorganic mineral is 100: (10-300): (500-6000): (5-100): (2-50): (10-200). The water absorbing material not only can be degraded under ultraviolet light, but also has high water absorption rate, can maintain water absorption performance after circulating freezing and thawing treatment, and spontaneously provides nutrients for soil.

A submerged water feeding pump with a water retention function comprises a motor, a base, a pump outer pipe, an inner pipe, a guide vane, a pump shaft, an impeller and a guide bearing, a sealing shaft sleeve and a valve clack are respectively sleeved on the pump shaft and above the impeller from bottom to top, the sealing shaft sleeve is axially and fixedly mounted on the pump shaft, and the valve clack is not in contact with the pump shaft and can axially move along the pump shaft. A first sealing face capable of being in contact with each other is arranged between the sealing shaft sleeve and the valve clack, a second sealing face capable of being in contact with each other is arranged between the valve clack and the guide vane, when the valve clack is reversely pressed, the first sealing face and the second sealing face are both in a sealing state, the first sealing face or the second sealing face is in elastic sealing, and valve closing is achieved. When the valve clack is pressed in the forward direction, the first sealing face and the second sealing face are both in an open state, and valve opening is achieved. Therefore, the pump cavity of the water feeding pump can be kept full of water during shutdown, and the water feeding pump and the main drainage pump connected with the water feeding pump can be started at the same time during restarting, so that the purpose of quick starting is achieved.

The invention discloses a preparation method of a water-retention expanded compound organic fertilizer, and relates to a preparation method of a compound organic fertilizer. The invention aims to solve the problem that the existing organic fertilizer has poor water retention or water storage capacity after improving soil. The preparation method comprises the following steps: carrying out hydrophobic treatment on attapulgite and humic acid, carrying out functional modification on the attapulgite by utilizing active functional groups such as carboxyl and phenolic hydroxyl of the humic acid, and compounding with an acrylic acid-acrylamide copolymer, a modified expanding agent, the humic acid, mushroom bran and the attapulgite to form the water-retaining expanded composite organic fertilizer. The surface of calcium carbide in the modified expanding agent is provided with a coating layer formed by xanthan gum, and after the modified expanding agent is applied to soil, the gel generates volume expansion, so that the water storage space is increased, and the water storage capacity is further improved. Due to the use of the expanding agent, the use amount of the acrylic acid acrylamide copolymer is remarkably reduced, the cost is remarkably reduced, and the expanding agent has relatively good practicability and can be popularized.

The application provides an in-situ liquid gel-forming water-retaining agent and a preparation method and application thereof. The water-retaining agent is composed of A component and B component which are applied in steps. The A component contains an aqueous solution of a natural modified polymer, and the natural modified polymer is selected from one or two of carboxymethyl chitosan, carboxymethyl cellulose or a sodium salt thereof. The B component contains an aqueous solution of a cationic crosslinking agent, and the cationic crosslinking agent is selected from one or more cations of copper nitrate, iron nitrate, zinc nitrate, manganese nitrate, chitosan quaternary ammonium salt, calcium nitrate and magnesium nitrate. The water-retaining agent can realize the integrated functions of slow release of trace elements, water retention, soil improvement and precise nutrition supply. Furthermore, the water-retaining agent is applied to crop growth in combination with the "step-by-step drip irrigation and in-situ gel formation" technology, so that the agronomic characters of crops can be significantly improved.

The present invention is applicable to the field of environmental engineering technology, and provides a new sand-fixing material with the function of fixing carbon and increasing carbon sinks, including a material package, wherein the material package includes shrub seeds, herb seeds, crust dry matter, cement and water retaining agent, and the weight ratio of the shrub seeds, herb seeds, crust dry matter, cement and water retaining agent is 3:3:2:1:1. The method for using the new sand-fixing material with the function of fixing carbon and increasing carbon sinks includes the following steps: step 1, identification of background conditions and collection of samples; step 2, propagation and processing of crust dry matter; step 3, detection of biological activity of crust dry matter; step 4, preparation of material package; step 5, inoculation of material package. The new sand-fixing material planted by this method has the advantages of low cost, high efficiency, easy implementation, multifunctionality and sustainability, and has good use effect.

The invention relates to the technical field of soil improvement, in particular to a functional seaweed extract as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) soaking seaweed with water, taking out, drying, mincing, adding an ethanol solution, stirring and extracting to obtain an extracted mixture; (2) centrifugally filtering the extracted mixture to obtain a seaweed solid substance and an extracting solution, and carrying out reduced pressure distillation on the extracting solution to obtain extracted seaweed; (3) grinding and crushing the extracted seaweed, and adding mixed enzyme for enzymolysis to obtain an enzymolysis product; (4) mixing the seaweed solid substance and the enzymolysis product, filtering, and centrifuging to obtain an extracting solution; and (5) adding a flocculating agent into the extracting solution for flocculation, carrying out solid-liquid separation, and carrying out vacuum concentration. Active components in seaweed can be fully extracted, the effectiveness of plant growth promoting components in the seaweed extract is improved, the physical and chemical indexes of sandy soil are improved, meanwhile, the water retention capacity of soil is improved, yield increase is promoted, and the improvement effect of the sandy soil is improved.