212 results about "Lime-nitrogen" patented technology

The invention discloses a double-cropping greenhouse cultivation method for xiangfei grapes, which is used for cultivating xiangfei grapes in a double-cropping manner by adopting an independent main horizontal vine shaping way in the greenhouse. The double-cropping greenhouse cultivation method for xiangfei grapes specifically comprises the following steps of (1), cultivating first-season grapes, wherein winter pruning is carried out within 20-30 days after harvesting the fruits in the previous year, one fruited cane is selected and remained every 15cm-25cm, and the short cranes with two to three buds are pruned; lime nitrogen is used for accelerating germination after the pruning, the young sprouts are tied vertical to the main vane, the six to eight leaves of the young sprouts are remained and pinched according to the inflorescence before flowering; theone to two leaves of the side sprouts are remained and pinched, one to twoclusters are remained for each sprout, and the clusters are mature in the last ten-day period of June to the first ten-day period of July; and(2), cultivating second-season grapes, wherein summer pruning is carried out at the end of July or at the beginning of August, middle sprouts with four to seven buds are remained for the young sprouts and pinched; the lime nitrogen is used for accelerating germination after the pruning; six clusters are remained per square meter; and the second-season grapes are mature and harvested in the last ten-day period of December. The grapes produced by the double-cropping greenhouse cultivation method for xiangfei grapes are excellent in quality, obvious in anti-season effect, high in sale price, considerable in economic benefits and capable of achieving dependable crop every year.

The invention relates to a modifier for acidic soil. The modifier comprises the following components in percentage by weight: 10-30% of yellow phosphorus slag, 5-20% of acidic soil modifier, 5-10% of artificially synthesized high-molecular compound, and the balance of mineral substances, wherein the yellow phosphorus slag mainly comprises CaSiO3; the acidic soil modifier refers to lime substances such as calcium carbonate, calcium oxide, lime nitrogen and the like; the artificially synthesized high-molecular compound refers to one or a mixture of more of polyacrylic acid, vinyl acetate maleic acid and polyvinyl alcohol type high-molecular compounds; mineral substances refer to peat, lignite, decomposed coal, vermiculite, bentonite, zeolite, perlite, sepiolite and the like. The modifier can effectively improve the yield reduction phenomenon of crops caused by an acidic hardened land, and has the advantages of being low in cost, fast, and simple to operate and the like.

The invention relates to a tobacco plantation soil acidification improver and an application method thereof. The improver is prepared from the raw materials of: 20-30wt% of quick lime, 50-60wt% of dolomite powder, 5-10% of lime nitrogen, and 10-15wt% of peat. The application method comprises the steps that: (1) the soil is sampled, and pH value is measured; and (2) according to different pH values, the improver with different dose is applied. With the soil improvement structure, soil caking is prevented, soil organics are supplemented, and soil-borne diseases of tobaccos can be comprehensively controlled. The improver has the advantages of simple preparation method, easy-to-obtain raw materials, and low cost.

The invention discloses a capsicum soil-less cultivation substrate and its preparation method, the capsicum soil-less cultivation substrate comprises raw materials and an additives, the types and the ratio of the raw materials are: fermented corn straw: fermented cow dung: fermented mushroom slag: desert sand is 4.0V: 2.0V: 2.5V: 1.5V, the types and ratio of additives added in 1m<3> raw materialsare: 0.5g lime nitrogen, 1.0kg Bio-organic fertilizer, 20.0g trichlorfon stock solution and 20.0g 50% of carbendazim wettable powder. The capsicum soil-less cultivation substrate of the invention hasthe advantages of scientific formula and simple technology, can substantially reduce the production cost of the cultivation substrate after using, and is capable of raising the output and quality of capsicum, increasing peasant income, accelerating the popularization and application of organic ecotype soil-less culture technology.

The invention discloses a planting method for regulating and controlling continuous cropping obstacles of atractylides macrocephala koidz, which comprising the following steps of: applying 40 to 100g of lime nitrogen to each square meter of a continuous cropping field, performing deep tillage, watering soil by using 500 to 1,000 times of prochloraz or fluazinam, covering by using a thin film for 15 to 20 days, uncovering the thin film, ventilating for 10 to 15 days, and planting the atractylides macrocephala koidz and applying 0.5 to 3.5kg of biological organic fertilizer per 5 square meters; and irrigating the root of the atractylides macrocephala koidz once by using 500 to 1,000 times of the prochloraz or the fluazinam or hymexazol before disease outbreak in June and July; or the planting method comprises the following steps of: ploughing and covering the thin film after the crop rotation of spring corn, irrigating until water is above the soil surface, keeping hermetic for 20 to 90 days, and uncovering the thin film to plant the atractylides macrocephala koidz. By the planting method, the incidence rate of diseases such as root rot, southern blight and the like of the atractylides macrocephala koidz is reduced greatly, the seedling survival rate of the atractylides macrocephala koidz is improved, and the yield of atractylides macrocephala koidz rhizomes is improved. Simultaneously, the utilization rate of land can be improved to improve economic benefits.

The invention relates to an agricultural waste recycling technology and a soil fertilizer technology, in particular to a blended facility vegetable field soil conditioner taking charcoal as a matrix and a preparation method thereof. The blended facility vegetable field soil conditioner comprises the following components in percentage by weight: 60 to 80 percent of charcoal, 5 to 15 percent of medical stone powder, 5 to 15 percent of zeolite powder and 5 to 15 percent of lime nitrogen. The method for preparing the soil conditioner comprises the following steps of: mixing and stirring the medical stone powder which is sieved with a 60-mesh sieve, the zeolite powder which is sieved with a 60-mesh sieve and the granular lime nitrogen uniformly, mixing the mixture with the charcoal, and stirring uniformly to prepare the soil conditioner. The method is simple and pollution-free, the volume weight of soil can be reduced, the buffer performance of the soil can be improved, the utilization rate of fertilizer nitrogen and phosphorus can be improved, and an effect of preventing and controlling soil-borne diseases is achieved.

The invention discloses a beneficiation reagent, a synthesis method and a method for comprehensively utilizing generated waste gases. The beneficiation reagent is formed by solid-phase synthesis of inorganic or organic raw materials and comprises the following raw materials in parts by weight: 300 to 700 parts of a nitrogen-containing compound, 500 to 800 parts of chlorine salt, 400 to 650 parts of carbonate, 80 to 160 parts of strong alkali, 50 to 500 parts of cyanide complex double salt, 0 to 300 parts of cyanate, 5 to 20 parts of potassium sulfide, 50 to 200 parts of carbon and 0 to 100 parts of lime nitrogen. The beneficiation reagent is prepared by the following steps: mixing the raw materials uniformly; adding the mixed raw materials into a reaction kettle; quickly heating to 500 to 1,200 DEG C; maintaining high temperature for 1 to 2 hours; and cooling and crushing to obtain the product. Ammonia gas and carbon dioxide generated in a synthesis process are absorbed by a sodium sulfate solution to generate byproducts sodium carbonate and ammonium sulfate. The invention has the advantages of low production cost, simple operation, low toxicity and easy control. The product can be widely applied to leaching of noble metals such as gold oxide ores and silver oxide ores, floatation inhibitors and metal heat treatment and electroplating industries.

The invention relates to a soil fertilizer technology and a crop disease and insect pest control technology, in particular to a disease-resistant synergy-type conditioner of protected horticultural vegetable field soil and a preparation method thereof, solving the problem that sustainable utilization of protected horticultural vegetable field is affected by the lowering soil quality. The soil conditioner comprises the following components in percentage by weight: 30-50% of medical stone powder, 20-30% of lime nitrogen, 20-30% of lignite, 5-10% of zeolite power and 5-10% of dicyandiamide. The preparation method of the soil conditioner comprises the following steps: medical stone powder screened by a 60-mesh screen, zeolite powder screened by a 60-mesh screen, the dicyandiamide and lignite are mixed and evenly stirred; then the mixture and granular lime nitrogen are mixed and evenly stirred; and after being completely mixed, the mixture is prepared into the soil conditioner. The preparation method of the invention is simple, has no pollution, can obviously improve fertilizer nitrogen and phosphorus utilization ratio of the protected horticultural vegetable field, effectively prevent and cure soil-borne diseases and has the effect on improving physical and chemical properties of soil at the same time.

The invention discloses a special compound fertilizer for tobacco and an application method thereof. A granular compound fertilizer is prepared by mixing, stirring and crushing 2 to 10 mass percent of urea, 5 to 20 mass percent of ammonium phosphate fertilizer, 5 to 15 mass percent of potassium nitrate, 10 to 30 mass percent of potassium sulfide, 0 to 15 mass percent of lignosulfonate, 0 to 20 mass percent of coal, 5 to 20 mass percent of attapulgite and 0 to 2 mass percent of borax and performing granulation, drying, cooling and screening, and is doped and uniformly mixed with 0 to 5 mass percent of granular lime nitrogen to prepare a special compound fertilizer finished product for tobacco, and the compound fertilizer finished product is matched with other fertilizers for application 5 to 15 days before the transplantation of tobacco seedlings. The formula of the special compound fertilizer for tobacco has high practicability for southern tobacco areas, and the serious problems of soil acidification and the like caused by conventional fertilizer application formula can be solved; in addition, certain amounts of medium trace elements and synergist are added in the formula, so that requirements on mineral nutrition in a tobacco plant development process can be met, the utilization rate of nutrition is increased, the number of fertilizer application times is reduced, and the yield of tobacco plants and the quality of tobacco leaves are remarkably improved.

The invention discloses a method for treating and recycling green stalks of peppers planted in a greenhouse. The method for treating and recycling the green stalks of the peppers planted in the greenhouse comprises the following steps: reserving the green stalks after spring early mature peppers planted in the greenhouse are harvested from the mid-to-end of June to the first ten-day period of July, chopping the green stalks and ploughing the green stalks under the ground by adopting a stalk chopping and rotary cultivating machine directly, uniformly spreading lime nitrogen and a fertilizer required by growth of next-stubble crops, and then carrying out deep ploughing once; then irrigating water thoroughly, laying drip irrigation pipes, mulching a mulching film, shielding the greenhouse with a greenhouse film, maintaining soil to be moist by utilizing the drip irrigation pipes, and maintaining soil humidity to be balanced by moving the drip irrigation pipes in parallel; and sealing the greenhouse, carrying out soil sterilization by utilizing intense sunlight and high temperature in summer, removing the mulching films away before field planting of the next-stubble crops, and removing the greenhouse film away for ventilating. When the method for treating and recycling the green stalks of the peppers planted in the greenhouse is adopted for planting the peppers continuously or other vegetables in the next stubble, crop pests of the next-stubble crops can not be increased, the soil organic matter content is increased, the soil fertility is improved, the soil is improved, and a production and life environment in a village is protected; meanwhile, the labour intensity is reduced, the yield is increased, and the aims of saving cost and improving the efficiency are realized.

The invention discloses a modifier for acidized bamboo soil, which comprises the following materials by weight percent: 45-55% of lime nitrogen, 20-30% of biomass carbon, 10-20% of calcium oxide, 5-10% of magnesium oxide and 5-10% of trace elements. The modifier for acidized bamboo soil provided by the invention is prepared by taking the lime nitrogen and biomass carbon as main parts and matchingwith the trace elements, is capable of repairing and treating the acidized bamboo soil, is capable of preventing and treating soil-borne pest and disease damage and balancing the requirement for the nutrition of the trace elements in bamboo, and has the three functions of 'acid-controlling, pest-treating and nourishing'. The modifier for acidized bamboo soil and the special fertilizer for the bamboo are applied together, so that the acidification of the bamboo soil is thoroughly eliminated, the repairing for the acidized soil is economically and efficiently realized, the soil-borne pest and disease damage is prevented and treated, the soil fertility is quickly increased and the yield and quality of the bamboo are increased.

The invention provides a synthetic process of hexazinone. The synthetic process comprises the steps of: by taking ethanol, lime nitrogen, cyclohexylamine, dimethylamine, dimethyl sulfate, sodium methoxide and phosgene as main active ingredients, generating a series of chemical reactions in solvent, and carrying out desolventizing and concentration, crystallizing and separating and drying to obtain a finished hexazinone product. According to the synthetic process, the solvent extraction can be omitted, the reaction procedures can be reduced, the efficiency can be improved, the energy consumption can be saved by 10%, and the conversion rate can also be improved by 5%; while the amount of waste water can be greatly decreased, dimethylamine can be recycled, and the quality of solvent can be guaranteed; a great amount of water can be saved, therefore, the production cost can be greatly lowered.

The invention belongs to the field of soil improvement, and discloses a method for removing the continuous-cropping obstacles of facility cultivation soil. The method comprises the following steps: selecting a time period with the highest air temperature and the strongest sunlight in summer, preparing 1-1.5 t of an organic fertilizer, 100-150 kg of lime-nitrogen granules, 10-25 kg of plant ash, 30-50 kg of a soil bactericide solution mixed with water of 500-800 times, and 1-1.5 kg of a microbial preparation per mu; spreading the mixed fertilizer subjected to uniform mixing on the soil surface;carrying out deep tillage and building beds, carrying out film coverage, water irrigation and sealing, and controlling the temperature, wherein the temperature of a soil layer with a depth of 20-40 cm is 40-50 DEG C on a sunny day; controlling the temperature of the soil surface to be larger than or equal to 70 DEG C; controlling the temperature and carrying out disinfection for 20-30 days; and removing films. Through the method provided by the invention, the fertility of the soil can be increased, simultaneously sterilization is carried out by utilizing acidity and alkalinity, the bactericide is further utilized to eliminate the soil diseases and insect pests caused by repeated planting of a same crop, and the yield of continuous-cropping plants of the soil is increased.

The invention relates to a calcium-magnesium-containing organic mineral fertilizer. The calcium-magnesium-containing organic mineral fertilizer consists of the following ingredients in percentage by weight: 5 to 30 percent of lime nitrogen, 10 to 15 percent of calcium magnesium phosphate fertilizer, 20 to 25 percent of turf, 10 to 15 percent of plant ash, 25 to 30 percent of dolomite powder with granular size of less than or equal to 60 meshes and 5 to 10 percent of bentonite. The preparation method comprises the following steps of: weighing the lime nitrogen, the calcium magnesium phosphate fertilizer, the turf, the plant ash, the bentonite and the dolomite powder according to the weight ratio; placing the materials into a stirring machine to stir and mix; performing pelleting by using apelletizer; roasting the materials at the temperature of between 200 and 400 DEG C for 20 to 50 minutes by using a roaster; and sieving the materials by using a sieving machine to prepare the calcium-magnesium-containing organic mineral fertilizer. By the calcium-magnesium-containing organic mineral fertilizer and the preparation method thereof, yield increment of crops can be promoted; quality of the crops can be improved; the structure of soil can be improved; and the crops are safe to eat.

The invention discloses a method for disinfection and pH regulation of total straw application soil. The method for disinfection and pH regulation of the total straw application soil comprises the following step of smashing straw; after rice is ripe, utilizing a combine harvester to perform rice harvesting and straw smashing and returning to fields; performing combined application of decomposition agent and then turning over the fields; and dispersing quicklime and lime nitrogen. According to the method, the pH of the total straw application soil can be improved effectively, the straw decomposition speed is quickened, poisonous and harmful microorganisms and harmful bacteria are effectively killed, the N element content of the soil is increased, and the method is favorable for healthy growth of succession crop (late rice).

The invention discloses a fertilizer and pesticide composition for strawberries. The composition comprises an organic fertilizer, a pesticide and a filler; the organic fertilizer comprises bean cakes, rice husks, mushroom residues, traditional Chinese medicinal residues, rice bran, chicken manure, plant ash, borax and Bacillus subtilis; the pesticide comprises lime nitrogen, sulfur, pentachloronitrobenzene and phoxim; and the filler comprises peat, vermiculite and perlite. The fertilizer and pesticide composition effectively control the successive cropping obstacle of soil borne diseases, improves the soil structure, has stable and lasting fertilizer effects, and allows planted plants to be strong and have enhanced stress resistance; and organic matters contained in the composition are wastes, have wide sources, and are combined to reduce pollution of agriculture wastes to environment.

The invention discloses a multifunctional acid soil conditioner and an application method thereof. The multifunctional acid soil conditioner is prepared by mixing 10 to 25 percent of magnesium hydroxide, 15 to 30 percent of calcium carbonate, 5 to 25 percent of calcium hydroxide, 10 to 25 percent of calcium magnesium phosphate fertilizer, 0 to 15 percent of lime nitrogen, 0 to 30 percent of lignite, 0 to 30 percent of danty, 0 to 30 percent of peat, 0 to 2 percent of borax and 0 to 3 percent of zinc sulfate in percentage by weight, and stirring uniformly. For solving the series of problems that southern soil is serious in acidification, degenerate in structure and frequent in soil-borne disease, on the basis of combining a great amount of field trial results, an acid soil conditioner formula having the functions of providing nutrition, improving the soil, killing the soil-borne disease and the like is developed, and meanwhile a certain amount of medium trace elements and synergists are added in the formula, so that the formula can meet the need of plants on medium trace nutrient elements in a growth development process, so as to remarkably improve the yield and quality of crops.

The invention relates to an acid soil conditioner and belongs to the technical field of agriculture. The acid soil conditioner can be used for overcoming the defects of the single application of quick lime. The acid soil conditioner provided by the invention is prepared by mixing the following materials by weight percent: 0.2-2.0% of dolomite, 0.2-2.0% of potassium feldspar, 1.0-5.0% of quick lime, 1.0-5.0% of lime nitrogen, 1.0-5.0% of limestone flour, 1.0-5.0% of slaked lime, 1.0-20.0% of calcium magnesium phosphate, 2.0-10.0% of boric sludge, 2.0-10.0% of calcarea carbonica and the balance of kieselguhr. The acid soil conditioner is scattered onto the soil surface in a soil preparation process; the dosage is 50.0-150.0kg/mu; and the soil is turned over and the acid soil conditioner is uniformly mixed with 20cm surface soil after the acid soil conditioner is applied.

The invention belongs to the field of soil improvements, and relates to application of soil conditioner containing chitosan oligosaccharide to acid soil conditioning. The conditioner is prepared from 0.05-100 parts of chitosan oligosaccharide, 0-80 parts of soil improvement components, 0-15 parts of artificially synthesized high-molecular compounds and 0-100 parts of mineral substances. The soil improvement components are one or more of lime, plant ash, dolomite, coal ash, slaked lime, calcium carbonate, powdered rock phosphate, ammonium carbonate, lime nitrogen and the like in alkaline substances. The artificially synthesized high-molecular compounds are obtained by mixing one or more of polyacrylic acid type high-molecular compounds, vinyl acetate maleic acid type high-molecular compounds and polyvinyl alcohol high-molecular compounds. The mineral substances are obtained by mixing one or more of peat, brown coal, decomposed coal, vermiculite, bentonite, zeolite, perlite and sepiolite. When applied, the soil conditioner is uniformly sprayed or atomized on the surface of acid soil, and the acid soil is uniformized through deep tillage arrangement or rotary tillage; or, the soil conditioner is used for topdressing; in the application method, the application amount of the soil conditioner ranges from 50 kg/hm<2> to 1000 kg/hm<2>, the soil conditioner is applied 1-3 times, the pH value of soil can be promoted to rise, the soil acidity can be lowered, or soil can be neutral.

The invention discloses a composite modifying agent for repairing paddy field soil Cd pollution. The composite modifying agent comprises the following raw materials: 10-20% of lime nitrogen, 10-20% of silicon fertilizers, 25-35% of zeolite powder, 5-15% of calcium magnesium phosphate fertilizers, and 25-35% of organic fertilizers. The invention further provides a preparation method and an application method of the preparation. The preparation method of the composite modifying agent is simple, and is easily performed; the absorption of paddies planted on heavy metal-polluted soil to a heavy metal Cd is effectively restrained through the effects of all the components; the composite modifying agent is a novel composite modifying agent with high efficiency, environmental protection and convenience for use, and can achieve the effects of base fertilizers through providing various nutrient elements to the paddies.

The invention discloses a control method of solanaceous vegetable soil continuous cropping obstacles. The method comprises the following steps: in the greenhouse fallow period, spreading lime nitrogen on soil, overturning, harrowing, watering, covering a film, sealing the greenhouse, and carrying out fumigation treatment at 60 DEG C or above for 15-25 days; and after the fumigation finishes, carrying out ventilation treatment on the greenhouse for 8-12 days, applying a biological bacterial fertilizer (800-1500kg.hm<-2>), carrying out ridge forming, transplanting solanaceous vegetable seedlings into the greenhouse, and covering the film. By applying the lime nitrogen in the earlier stage, the decomposition of the lime nitrogen obviously lowers the generation of soil-borne diseases of continuous cropping soil, and improves the physicochemical properties and biological properties of the soil. The biological bacterial fertilizer is applied in the planting process to reconstruct the healthy soil microecological environment, improve the soil structure, enhance the organic content of the soil and improve the saline-alkali soil, so that the soil microenvironment is improved, the plant root has sufficient nutrients, and the root system grows vigorously and has higher absorptivity. Besides, the biological bacterial fertilizer contains rich nutrients, and thus, can enhance the quality and yield of the agricultural products.

The invention discloses an alkaline organic fertilizer for restoring soil polluted by heavy metals and a preparation method of the alkaline organic fertilizer, and relates to the technical field of agricultural fertilizers. The alkaline organic fertilizer is prepared from, by weight, 1-3 parts of urea, 1-3 parts of potassium sulphate, 2-6 parts of diammonium phosphate, 10-30 parts of tobacco straw, 30-40 parts of alkaline ash, 15-35 parts of livestock manure, 10-30 parts of bean stalks, 10-30 parts of purple soil, 1-3 parts of microelements, 0.5-1.5 parts of biological bacteria, 3-5 parts of lime nitrogen and 0.02-0.04 part of nitragin. The alkaline organic fertilizer has a good restoring effect on the soil polluted by the heavy metals, is suitable for being used in acidic soil, can be used for farmland soil heavy metal pollution restoration and ecological improvement in southern paddy fields in China, and can also be used for dry farmland soil heavy metal pollution restoration and ecological improvement in the south.

The invention discloses a greenhouse vegetable soil sunlight disinfection method. The method comprises the following steps of: in leisure time in summer, clearing up previous crop residues, and uniformly applying ammonium bicarbonate on the surface of the soil according to the usage amount of 0.05 to 0.15kg/m<2>; and deeply plowing the soil for 30 to 40cm, flattening, covering a transparent thin film on the surface of the soil, watering under the film, sealing the greenhouse and performing sunlight irradiation disinfection for 25 to 50 days. The provided greenhouse vegetable soil sunlight disinfection method has the advantages of replacing the currently used lime nitrogen by novel soil-aided additive ammonium bicarbonate, and overcoming the defects of high price, narrow source and inconvenient large-area application of the lime nitrogen. The soil disinfection effects of the lime nitrogen and the ammonium bicarbonate are compared, the results prove that the ammonium bicarbonate has the same or better soil sunlight disinfection effect than the lime nitrogen.

The invention discloses a method for improving orchard soil. The method is characterized by comprising a step (1) of a high temperature disinfection method, wherein lime nitrogen of 70-80 kg and shattered wheat straw of 500-1000 kg per 667 square meters are applied during June to August after seedlings of previous crops are pulled up, furrows with the depth of 30 cm are ditched by rotary tillage, leveling, ridging or row spacing of the crops, the wheat straw or corn stalk of 3000 kg, ammonium bicarbonate of 50 kg, poultry dung of 5-6 cubic meters per 667 square meters are applied, surface soil covering is performed to form a ridge, a greenhouse film is sealed, a mulching film is covered tightly to perform irrigation, 500-1000-fold abamectin liquor of 200 milliliters per plant is utilized to irrigate roots after 15-20 days of insolation and high temperature processing and entering the greenhouse, and the effect for preventing soil-borne disease is good, and a step (2) of irrigation salt-leaching method, wherein the greenhouse is fully loaded with fresh water during rotation of crops and when the soil is not used to form accumulated water of 3-5 cm, the water is discharged from drainage ditches after soil salinity is dissolved fully, and the salinity in the soil is reduced effectively.

The invention discloses straw biomass charcoal activated and modified by composite sodium selenite and used for a soil improvement agent. The straw biomass charcoal is prepared from the following raw materials in parts by weight: 86-88 parts of wheat straws, 12-14 parts of tobacco straws, 2.8-3.1 parts of calcium chloride, 1.9-2.3 parts of sodium selenite, 0.7-0.9 part of potassium permanganate, 2.2-2.5 parts of polyethylene glycol, 5-7 parts of coal ash, 6-8 parts of bone meal, 2-4 parts of lime nitrogen, 3-5 parts of orange peel oil, 0.1-0.2 part of sophocarpidine, 0.2-0.4 part of naphthylacetic acid, a proper amount of sodium hydroxide solution with concentration being 10wt.%, a proper amount of mixed acid liquor, and a proper amount of deionized water. The straw biomass charcoal prepared can be used for remarkably increasing content of selenium in soil while used for the soil improvement agent, is greatly beneficial for selenium-rich crops, can be used to remarkably save water and reduce drought resisting cost, and is excellent in water absorption, water storage and water retention capacity.