415 results about "Phosphate fertilizer" patented technology

The invention relates to the technical field of sludge resource utilization, in particular to a method for recycling phosphorus in sludge gasification slag. According to the method disclosed by the invention, the sludge gasification slag is subjected to acid leaching treatment, and the sludge gasification slag is subjected to acid leaching by adopting a dilute sulfuric acid solution in the process, so that the dissolution of other impurities can be effectively avoided while the phosphorus element is extracted, the extraction efficiency is high, and the purity of the obtained product struvite can be effectively ensured. The method disclosed by the invention is simple in process and low in equipment requirement, can realize extraction of phosphorus in the sludge gasification slag at lower cost, and has very high economic benefits; meanwhile, the obtained struvite is high in purity and can be used as a raw material for producing a phosphate fertilizer or a slow-release fertilizer, solid waste resource utilization and environment-friendly economic benefits are improved, and the struvite has positive significance on sludge reduction, harmlessness, stabilization and recycling.

The invention discloses a method for selectively recycling phosphorus pollutants in low-concentration phosphorus-containing sewage and preparing high-quality blue iron ore and application, and belongs to the technical field of water treatment and recycling thereof. According to the method, the low-concentration phosphorus-containing sewage is adsorbed by a phosphorus specific nano adsorption material HFO-201, and then the material is desorbed by adopting sodium hydroxide and sodium chloride with specific concentrations. The desorbed filtering material and the filtered material can be repeatedly used for adsorbing phosphorus in low-concentration sewage. After the pH value of the filtered desorption solution is adjusted to a certain concentration, FeCl2 with a certain concentration is added, and high-quality blue iron ore (Fe3 (PO4) 2.8 H2O) can be generated by keeping the pH value through sodium hydroxide under an anaerobic condition. The phosphorus product recovered by the process can be used for preparing a high-value phosphate fertilizer and a high-energy-density energy storage material, namely lithium iron phosphate (LiFePO4). The HFO-201 used in the invention can realize low-concentration phosphorus adsorption through an ammonium group combined with a D-201 matrix and loaded HFO nanoparticles. And moreover, after alkali desorption, the damage to the material is very low, and the material can be repeatedly used. And finally, the process of producing the high-quality blue iron ore through phosphorus recovery of the desorption solution is simple and easy to operate. Through XRD, ICP and other detection, it is found that the phosphorus recovery product is determined to be the blue iron ore, and the purity is very high. Through economic analysis and life cycle evaluation, it can be found that the method has remarkable economical efficiency, and the influence on the environment in the production process is small.

The invention provides a special package compound fertilizer for peppers and a topdressing method thereof. The special package compound fertilizer comprises a nitrogen fertilizer, a phosphate fertilizer, a potash fertilizer, a calcium fertilizer, a magnesium fertilizer, a boron fertilizer, a microbial compound fertilizer and an amino acid fertilizer. The microbial compound fertilizer is prepared from a mixed arbuscular mycorrhizal fungal agent, a zinc fertilizer and manure, the mixed arbuscular mycorrhizal fungal agent is Glomus fasciatus Vermann and sclerosporum Dusii, topdressing is started according to the mass ratio of nitrate ions to ammonium ions being 1: (2-3) 10 days after the pepper is transplanted, and topdressing is carried out for 6 times in total. According to the chili package compound fertilizer, the chili nutrient absorption rule and the nutrient utilization efficiency are taken as the fertilization starting point, the nitrogen-phosphorus-potassium fertilizer is taken as the main body, and medium trace elements with large demand quantity for chili are added, so that the chili yield can be remarkably increased, the fruit quality can be improved, and the chili package compound fertilizer is suitable for being popularized and used in chili planting areas.

The invention relates to the field of environment and agricultural biotechnology, in particular to an application of a composite phosphate-solubilizing bacterial agent in promoting wheat growth, which is characterized in that germinated wheat is cultivated firstly, then the germinated wheat is placed in soil mixed with the composite phosphate-solubilizing bacterial agent to be cultivated, and then the germinated wheat is cultivated in soil mixed with the composite phosphate-solubilizing bacterial agent. Furthermore, the growth of wheat is promoted by the cooperation of enterobacter hormaechei HS6, pantoea agglomerans CT3 and wheat bran in the compound phosphate-solubilizing bacterium agent. Wherein the enterobacter hormaechei HS6 and the pantoea agglomerans CT3 can efficiently convert insoluble phosphorus in the soil into soluble phosphorus, the utilization rate of phosphorus in the soil is effectively increased, the use amount of chemical phosphate fertilizer is reduced, nutritional ingredients are increased for the soil, the physical and chemical properties of the soil are improved, wheat growth can be well promoted, and the application prospect is good.

The invention discloses a method for immobilizing growth-promoting rhizobacteria by taking decarburized gangue-based biochar as a carrier, a solid waste-based microorganism immobilization ball prepared by the method and application of the solid waste-based microorganism immobilization ball, and relates to the technical field of solid waste utilization. The method comprises the following steps: preparing gangue-based zeolite by microwave activation and decarburization of coal gangue; preparing gangue-based biochar by utilizing phosphorus modification; and preparing the solid-waste-based microorganism solidification balls by utilizing an adsorption-embedding-crosslinking method. The decarburized gangue-based biochar is used as a carrier material for immobilizing the growth-promoting rhizosphere bacteria, and is used for restoring the sandy degraded soil in the northwest arid mining area. According to the technology, the survival time and functional activity of the growth-promoting rhizobacteria in the soil environment can be improved, and a new way is provided for consumption of bulk gangue solid waste. The method also has the technical advantages of improving the carbon source utilization rate of the gangue and increasing the phosphate fertilizer and the organic carbon library of the soil.

The invention discloses a preparation method of iron-modified biochar, which comprises the following steps: soaking biochar in an acid solution, taking out the biochar, recovering the biochar to be neutral, drying, mixing the dried biochar with an iron salt solution, fully reacting, drying and calcining to obtain the iron-modified biochar; the mass ratio of the dried biochar to iron in the iron salt solution is 0.28-0.84. The iron modified biochar has excellent phosphorus adsorption capacity in practical application, and has excellent phosphorus solid storage and continuous release capacity; the iron modified biochar can be used for soil phosphorus fixation and slow release, water pollution prevention and / or phosphate fertilizer saving, and can effectively promote plant growth.

The invention discloses a special growth-promoting microbial fertilizer for saline-alkali soil and a preparation method of the special growth-promoting microbial fertilizer, and belongs to the technical field of growth-promoting microbial fertilizer.The special growth-promoting microbial fertilizer for saline-alkali soil is obtained by mixing organic manure, ammonium humate, fungicide particles, crop straw, slow-release phosphate fertilizer particles, hydroxyapatite, chitosan and citric acid in proportion; according to the granular microbial inoculum carrier, the biochar particles and the iron-carbon composite microspheres serve as matrixes, the raw materials such as the fly ash form a foaming porous adhesive substance under the action of alkali excitation, the matrixes such as the biochar particles are bonded, a stable porous structure can be formed easily, a proper environment is provided for growth of phosphate solubilizing bacteria, and the phosphate solubilizing and growth promoting effects of the phosphate solubilizing bacteria are improved. The microbial agent particles have good water absorption and can adsorb sodium ions in soil after being watered, and calcium and magnesium components contained in the fly ash-based adhesive substance can be exchanged with the sodium ions to play a fixing role, so that the salt stress effect on crops is reduced.

The invention provides a preparation method of a lanthanum oxide modified biochar fertilizer, and belongs to the technical field of agricultural fertilizers, and the preparation method comprises the following steps: 1, microwave activation of biochar: placing corn straw biochar in a microwave reactor for radiation to obtain porous activated biochar; 2, potassium ion loading: dipping the porous activated charcoal in a saturated KOH solution to obtain a solid precipitate, and drying the solid precipitate to obtain potassium-loaded charcoal; 3, lanthanum-organic complex preparation: mixing lanthanum oxide with citric acid, adding deionized water to form a suspension, and performing evaporative crystallization to obtain a lanthanum-citric acid complex; 4, compounding modified biochar: mixing the obtained lanthanum-citric acid complex with potassium-loaded biochar to prepare slow-release lanthanum oxide modified biochar; and 5, compounding a phosphate fertilizer to obtain the slow-release composite charcoal fertilizer. According to the method, the charcoal is modified through lanthanum oxide, so that the modified charcoal has a larger specific surface area, the problem of hardening of the saline-alkali soil is better solved, and the oxygen content of the soil is increased.

The invention relates to a method for preparing a silicon-calcium-potassium-magnesium phosphate fertilizer from phosphate tailings, and relates to the technical field of phosphate tailing recycling, the method for preparing the silicon-calcium-potassium-magnesium phosphate fertilizer from the phosphate tailings comprises the following steps: carrying out acidolysis on the phosphate tailings to obtain a leaching residue A and a leaching solution M; an impurity removal agent is added into the leaching slag A, heavy metal elements in the leaching slag A are removed, and leaching slag B is obtained after solid-liquid separation; activating the leaching residue B by hot alkali, and performing solid-liquid separation to obtain a filter residue A; a phosphorus supplement is added into the leachate M, and filter residues B are obtained after solid-liquid separation; and fully mixing the filter residue A and the filter residue B to obtain the silicon-calcium-potassium-magnesium phosphate fertilizer. The method disclosed by the invention is low in energy consumption and high in phosphate tailing recovery rate, and the prepared silicon-calcium-potassium-magnesium phosphate fertilizer has a relatively high adsorption effect on part of main heavy metals.

The invention discloses a slow-release phosphate fertilizer as well as a preparation method and application thereof. Iron-phosphorus compound fertilizer is prepared by generating an iron oxide coating on the surface of the phosphate fertilizer through iron mineral precipitation. Wherein the iron oxide coating can prevent the phosphate fertilizer from absorbing moisture, reduce volatilization loss of phosphorus and realize controlled release of the phosphate fertilizer, the problems of phosphate fertilizer failure and excessive phosphorus loss are solved, and in addition, the coated iron ore used for synthesizing the compound fertilizer can supplement trace element iron in soil after being dissolved, so that the nutrition of the soil is improved. The invention further provides application of the slow-release phosphate fertilizer, along with dynamic changes of soil environment humidity and oxidation-reduction conditions, ferrous oxidation mineralization and phosphorus dissolution release on the surface of the controlled-release fertilizer have high controllability, the anaerobic-aerobic environment on the surface of the compound fertilizer can be changed through flooding-drainage, and the controlled-release intelligent phosphate fertilizer is formed; the controlled-release fertilizer is driven by water, the form change of iron in different environments is taken as a switch, the application method is simple, no influence is caused to the environment, and the controlled-release fertilizer is suitable for large-scale agricultural operation.

The present invention provides Paraburkholderia sp. LSOJM18 and use thereof as well as a microbial inoculum, belonging to the technical field of microorganisms. The Paraburkholderia sp. LSOJM18 was deposited to the China Center for Type Culture Collection on Dec. 29, 2022, with the depository number CCTCCNO: M20222102. With a strong phosphate solubilization capacity, the strain provided by the present invention is suitable for activating phosphorus in farmland soil. Using the phosphate-solubilizing bacteria can significantly increase the available phosphorus content of soil and reduce the application of chemical phosphate fertilizers. Acting on a wide range of substrates, the phosphate-solubilizing bacteria strain provided by the present invention can not only secrete phosphatase to hydrolyze organic phosphorus, but also release small molecules such as organic acids, etc., to activate the fixed inorganic phosphorus, and using the phosphate-solubilizing bacteria can significantly improve the phosphorus activation capacity of soil.

The invention discloses a method for recovering phosphorus through anaerobic digestion by adding sludge-based biochar, which comprises the following steps of: firing dewatered sludge serving as a raw material under an anaerobic condition to obtain carbonized carbon; or firing under an aerobic condition to obtain pyrolytic carbon, adding any sludge-based biochar obtained by firing into the hydrothermal dewatered sludge, and carrying out anaerobic digestion on the hydrothermal dewatered sludge; the hydrothermal dewatered sludge is obtained by performing hydrothermal pretreatment on dewatered sludge; and carrying out phosphorus recovery on the sludge-based biochar subjected to anaerobic digestion by utilizing a magnetic separation method. Compared with the traditional method for recovering the phosphate fertilizer from the sludge incineration ash, the recovery method disclosed by the invention is green and pollution-free, belongs to a sludge treatment mode of treating waste with waste, realizes effective combination of a heat treatment mode and a biological treatment mode, and has a good practical application value. Moreover, the prepared sludge-based biochar has the property of magnetism, so that the recovery rate of the subsequent blue iron ore is increased, and the separation difficulty and economic investment are reduced.

The invention provides a moniliella malayi and a fungicide and application thereof, and relates to the field of microorganisms. The acer rubrum is specifically acer rubrum RA, and the preservation number of the acer rubrum RA is CGMCC (China General Microbiological Culture Collection Center) No.35889. The acer rubrum RA can be used for preparing the acer rubrum. The strain has the capability of decomposing inorganic phosphorus, is wide in phosphorus-dissolving range, can decompose tricalcium phosphate, iron phosphate and aluminum phosphate, and particularly still has very strong capability of decomposing inorganic phosphorus under a low-temperature condition; the strain has the capability of producing siderophore and IAA at low temperature; the strain has an inhibition effect on various pathogenic bacteria causing field crop diseases, and can inhibit diseases such as corn root rot, sorghum leaf spot or wheat root rot; the strain can be colonized in a soil environment of 5-40 DEG C, a microbial inoculum prepared from the strain can promote crop growth, the crop yield is remarkably improved, and high yield can be achieved even if the usage amount of phosphate fertilizer is reduced.

The invention discloses an arbuscular mycorrhizal fungus inoculant for improving the yield of medicago truncatula in low-phosphorus soil as well as a preparation method and application of the arbuscular mycorrhizal fungus inoculant. The arbuscular mycorrhizal fungus inoculant comprises a culture medium, spores and ectogenic hyphae of arbuscular mycorrhizal fungi mixed in the culture medium, and a host plant root system infected by the arbuscular mycorrhizal fungi, the culture medium is river sand, and the arbuscular mycorrhizal fungi comprise glomus terrestris, Aureobasidium microconcave, glomus intraradices, glomus mosseae, glomus twistula and glomus macrosporium; the root system of the host plant infected by the arbuscular mycorrhizal fungi is the root system of the corn and alfalfa infected by the arbuscular mycorrhizal fungi. According to the method, different arbuscular mycorrhizal fungi strains such as glomus terrestris, aureoconcave aureoconcave, glomus mosseae, glomus intraradices, glomus twistula and pearl macrosporium are mixed according to a certain proportion, so that the phosphorus obtaining capacity of the host plant in a low-phosphorus soil environment can be effectively enhanced, and the yield of the host plant is further remarkably increased; meanwhile, the arbuscular mycorrhizal fungus inoculant can partially or completely replace phosphate fertilizer according to the soil phosphorus level of a specific pasture planting environment, so that related environmental pollution is reduced, and sustainable agricultural development of environmental ecology is facilitated.

The invention relates to the technical field of sustained and controlled release fertilizers, in particular to a soil-improving disease-resistant sustained and controlled release fertilizer and a preparation method thereof. The preparation method comprises the following steps: (1) preparation of the nutrient core: weighing an organic fertilizer, an ammonium nitrogen fertilizer, a phosphate fertilizer, a potash fertilizer, a biological regulator, chelated medium trace elements and modified attapulgite, uniformly mixing, and granulating to obtain the nutrient core; (2) covering an organic polymer coating layer: dissolving polylactic acid in a solvent to form a composite solution, spraying the composite solution on the surface of the nutrient core, and drying to obtain an organic polymer coated nutrient core; and (3) covering a mineral coating layer. The outermost layer of the soil-improving disease-resistant controlled-release fertilizer provided by the invention is the mineral coating layer, the mineral coating layer can be gradually disintegrated after being applied to soil, mineral components can improve the physical structure of the soil, regulate the acid-base property of the soil and increase the content of organic matters in the soil after entering the soil, and inorganic and organic nutrients are slowly released into the soil through the organic polymer coating layer; nutrient substances are continuously supplied, and common diseases of the corn are prevented and controlled.

The invention provides a special fertilizer for highland barley in Tibet high-altitude areas, which specifically comprises a matrix, a base fertilizer, an organic fertilizer, a trace element fertilizer, a modifier and a nutritional agent in a mass ratio of 100: 50: 100: 1: 15: 3, the substrate comprises loam, river sand and bentonite; the base fertilizer comprises nitrogenous fertilizer, phosphatic fertilizer and potash fertilizer; the organic fertilizer comprises bran, decomposed straw, decomposed excrement, plant ash and aquatic animal powder; the modifier comprises wormcast, silkworm excrement, perlite and vermiculite; the nutritional agent comprises compound vitamins, glucose, honey and compound amino acids; the raw materials used in the method are green, safe and pollution-free, the soil structure is improved while nutrient substances needed by highland barley growth are provided, the bran, the straw, the decomposed excrement and other agricultural wastes are used, cost is saved, efficiency is improved, and the utilization rate of resources is increased.

The invention discloses a method for increasing the yield of ratooning rice, and relates to a fine field management technology. In the whole process from sowing to harvesting, the method comprises the steps that nitrogenous fertilizer, phosphate fertilizer and potash fertilizer are applied in the specific growth stage, shallow water layer irrigation is kept, and water management is conducted immediately after first season rice is harvested so as to promote growth in the regeneration season. In addition, the method further comprises the steps of exogenous spraying of a plant growth regulator in the key growth period and unified management of diseases and pests. According to the technical scheme, the yield and stability of ratooning rice are improved by optimizing fertilization, irrigation and use of a plant growth regulator, and meanwhile environment safety and crop quality are guaranteed.

The invention discloses a fertilization method for improving cotton yield and phosphorus utilization efficiency, which comprises the following steps: a, formulating a personalized phosphate fertilizer application scheme according to soil properties, climate conditions and an expected yield target of a cotton planting area; b, timely adding a proper amount of water-soluble phosphate fertilizer according to the actual growth condition of the plant and a leaf nutrition diagnosis result; c, supplementing the phosphorus element by adopting a foliar spraying mode aiming at the possible phosphorus deficiency symptom; and d, adding a biological stimulant and a substance for promoting phosphorus absorption in the fertilization process. According to the fertilization method disclosed by the invention, through combination of precise fertilization, staged fertilization, biological stimulant application, dynamic monitoring and adjustment and a water-saving irrigation technology, the yield of cotton and the utilization efficiency of a phosphate fertilizer are effectively improved, the production cost is reduced, the ecological environment is protected, and the fertilization method has a wide application prospect.

The invention relates to the technical field of fertilizers, in particular to a seaweed-containing synergistic monoammonium phosphate fertilizer as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a seaweed extract with beta-cyclodextrin, performing microencapsulation, and performing spray drying to obtain an embedded material; mixing with monoammonium phosphate and polyglutamic acid, and granulating; spraying salt-resistant compound bacteria liquid on the surfaces of the particles; and finally, coating the particles with a chitosan-sodium alginate composite film. According to the prepared synergistic monoammonium phosphate fertilizer finished product, the phosphorus utilization rate of monoammonium phosphate saline-alkali soil can be increased, the phosphorus fixation rate can be greatly reduced, the retention rate of active ingredients of the seaweed extract is greatly increased compared with that in the prior art, the rhizosphere survival rate of salt-tolerant flora is greatly increased, and the salt-tolerant flora, the seaweed extract and monoammonium phosphate cooperate to promote crop yield increase.

The invention relates to the field of fertilizers, in particular to a special fertilizer for disease-resistant crops and a preparation method thereof.The special fertilizer comprises a nutrient core, a microbial agent coating and a medium trace element coating from inside to outside; the nutrient core comprises the following components in parts by weight: 35-40 parts of a nitrogen fertilizer, 20-25 parts of a phosphate fertilizer, 15-20 parts of a potassium fertilizer, 3-5 parts of a synergist and 1-1.5 parts of molasses; the microbial agent coating layer comprises 1-2 parts of a liquid microbial solution, 1-2 parts of a microbial protective agent and 3-5 parts of a microbial agent carrier; the medium trace element coating layer comprises 5-10 parts of a medium trace element fertilizer and 0.8-1.6 parts of a coating agent. According to the disease-resistant crop special fertilizer provided by the invention, the medium trace elements are added in an external wrapping manner, so that the condition that the effectiveness of nutritional ingredients is reduced due to chemical reaction between metal cations of the medium trace elements and phosphate ions in a phosphate fertilizer in a fertilizer production process is avoided.

The fertilizer hydrolysis stirring device comprises a stirring tank, a supporting frame and a ventilation structure, the ventilation structure comprises an annular ventilation pipe and a plurality of air guide pipes, the annular ventilation pipe is fixedly connected to the outer side of the stirring tank, and a plurality of second mounting pipes are arranged at the positions, corresponding to the center of the annular ventilation pipe, of the outer side of the stirring tank; the two ends of the second mounting pipe extend into the annular ventilation pipe and the stirring tank correspondingly, the air guide pipe is arranged in the stirring tank and inserted into the second mounting pipe, an air blower is arranged at the top of the supporting frame, a connecting pipe is mounted at an air outlet of the air blower, and the other end of the connecting pipe communicates with the annular ventilation pipe; according to the stirring tank, a solution can be continuously turned over in the stirring process, and monoammonium phosphate fertilizer is prevented from being deposited at the bottom of the stirring tank, so that the dissolving efficiency of monoammonium phosphate is improved, and the time required by the stirring process is shortened.

The invention relates to an application of a compound microbial agent in promoting phosphorus and potassium solubilization of soil and increasing the content of available phosphorus and potassium in the soil. The bacterial strains in the compound microbial agent consist of a bacillus coagulans BC66 bacterial strain, a lactobacillus plantarum LP194 bacterial strain and a lactobacillus acidophilus LA71 bacterial strain. The invention also relates to an application of the compound microbial agent in promoting phosphorus and potassium solubilization of the soil and increasing the content of available phosphorus and potassium in the soil, and the bacterial strains in the compound microbial agent consist of a bacillus coagulans BC66 bacterial strain, a lactobacillus plantarum LP194 bacterial strain and a lactobacillus acidophilus LA71 bacterial strain. The invention develops a brand-new microbial preparation capable of promoting the phosphorus and potassium solubilizing effect of soil, and researches find that the three strains are mutually matched and have synergistic interaction on the effects of promoting phosphorus and potassium solubilizing of soil, improving the content of available phosphorus and potassium in soil, improving the utilization rate of phosphate fertilizer and potassium fertilizer and increasing the yield of fruit trees, and the yield of the fruit trees is increased under the condition that the using bacterium amount is consistent. Compared with a single strain intervention mode or other strain combined intervention mode, the microbial preparation has the advantage that the effects are obviously improved. Therefore, the compound microbial agent provides a new strategy for promoting phosphorus and potassium solubilization of soil, increasing the content of available phosphorus and potassium in soil, increasing the utilization rate of phosphate fertilizer and potassium fertilizer and increasing the yield of fruit trees.

The invention belongs to the field of guidance of crop planting through image data processing, and particularly relates to a crop nutrient abundance and deficiency diagnosis model based on unmanned aerial vehicle image data and application thereof. The invention firstly provides a method for constructing a crop nutrient abundance and deficiency diagnosis model based on unmanned aerial vehicle image data, and the method comprises the following steps: S1, collecting canopy multispectral data of crops with different fertilizer application amount gradients in different growth periods, and collecting soil samples; s2; processing the multispectral data to obtain a vegetation index of crop growth, and measuring a soil nutrient index; and S3, obtaining a regression equation for calculating the soil nutrient index by using the key vegetation index, and judging whether the fertilizer needs to be supplemented or not by using the full-amount fertilization contrast as a threshold value. The invention further comprises the model and application of the model in guiding fertilization. Through unmanned aerial vehicle multispectral monitoring and dynamic threshold analysis, nutrient demand changes of crops in different growth periods are accurately captured in combination with an intelligent algorithm, and a field phosphate fertilizer deficient area is effectively identified to realize accurate fertilization.

The invention discloses a method for determining the allowable phosphate fertilizer application surplus of regional corn, and relates to the technical field of agriculture. The method comprises the following steps: according to field experiment data, obtaining the phosphate fertilizer yield increase of region corn; constructing a regression relationship between the phosphorus application amount and the yield increase; establishing a linear relationship between the phosphorus application amount and the phosphorus apparent equilibrium amount; determining a data range of phosphorus partial nutrient balance based on the phosphate fertilizer yield increment of the regional corn, and further obtaining a phosphorus application amount range; and according to the relationship between the phosphorus application amount and the phosphorus apparent equilibrium amount, determining the range value of the phosphorus apparent equilibrium amount, namely the allowable phosphorus application surplus amount of the region corn, and performing data conversion to obtain the allowable phosphorus fertilizer application surplus amount of the region corn. According to the method, while the corn yield is guaranteed, phosphorite resources are saved and utilized to the maximum extent, and feasible measures are provided for intensive management of phosphate fertilizer.

The invention relates to a spherical micron phosphate fertilizer with high fertilizer efficiency and a preparation method thereof. The preparation method of the spherical micron phosphate fertilizer with high fertilizer efficiency comprises the following steps: reacting a crystal form control agent and monocalcium phosphate in water for at least 12 hours, and performing spray drying through a spray dryer to obtain the spherical micron phosphate fertilizer. According to the spherical micron phosphate fertilizer with high fertilizer efficiency and the preparation method thereof, the preparation method is simple, the cost is low, the reaction conditions are mild, and the prepared spherical micron phosphate fertilizer is small in size and high in fertilizer efficiency.

The present invention belongs to the technical field of phosphate fertilizer production, and specifically relates to a zinc-containing diammonium phosphate, a preparation method thereof, and a fertilizer containing zinc-containing diammonium phosphate. Zinc-containing diammonium phosphate is prepared by coating elemental sulfur on the outer layer of solid zinc fertilizer to obtain a sulfur-containing zinc mixed slurry, which is then sprayed onto the diammonium phosphate for granulation to obtain the zinc-containing diammonium phosphate. The amount of solid zinc fertilizer added accounts for 30 to 100% of the total mass of elemental sulfur; and the amount of sulfur-containing zinc mixed slurry added is 1 to 10% based on the total weight of the zinc-containing diammonium phosphate. This preparation method avoids direct contact and antagonistic reactions between phosphate and zinc ions, prevents degradation of phosphorus and zinc nutrients, and maintains a good ratio of water-soluble zinc content and water-soluble phosphorus content.

The invention discloses a monocalcium phosphate / monocalcium phosphate spherical nano phosphate fertilizer as well as a preparation method and application thereof. The phosphate fertilizer is prepared from a calcium source, a precipitator and a phosphorus source through a chemical precipitation method. The monocalcium phosphate / monocalcium phosphate spherical nano phosphate fertilizer particles are free of agglomeration, good in dispersity, uniform in size distribution and regular in morphology, and the size of the nano phosphate fertilizer particles can be controlled from 1 nm to 200 nm by adjusting the adding proportion of the precipitant. The phosphate fertilizer prepared by the preparation method disclosed by the invention has a nanoscale size, is beneficial to migration in soil and is more easily absorbed by plant root systems or leaves, and the nano phosphate fertilizer has a spherical regular morphology, is beneficial to coating of a sustained and controlled release material on the surface of the nano phosphate fertilizer, and realizes sustained and controlled release of the nano phosphate fertilizer; meanwhile, the prepared nano phosphate fertilizer contains a large number of functional groups, the surface of the nano phosphate fertilizer can be modified, and functional design of the phosphate fertilizer is achieved.

The invention discloses preparation and application of a biological carbon type phosphate fertilizer synergist suitable for flue-cured tobacco, and relates to the technical field of phosphate fertilizer synergists. Comprising the following steps: step 1, preparing raw materials; 2, raw material treatment; and step 3, mixing and reacting: by taking the charcoal and the humic acid as main raw materials, the content of available phosphorus in soil can be increased, absorption and utilization of tobacco to calcium superphosphate and diammonium phosphate are increased, growth and development of the tobacco are promoted, the fresh weight of the tobacco leaves is increased, and the phosphorus accumulation amount of the tobacco is increased. According to the preparation and application of the biological carbon type phosphate fertilizer synergist suitable for flue-cured tobacco, the fixing agent, the water-retaining agent and the microbial agent are added into the biological carbon source to form the phosphate fertilizer synergist, the water-retaining agent can prevent water loss in soil, and the fixing agent can prevent phosphorus loss in the soil; and a mixture of compound sodium nitrophenolate and high-purity alpha-pimacol is added, so that the permeation, adhesion and spreading force of the fertilizer are increased, the limitation of plants is broken, and the capability of the fertilizer entering the plants is enhanced.

To provide a phosphate-containing solid and a method for producing the same, with the use of sewage sludge incineration ash as a raw material, which has a high proportion of citrate-soluble phosphoric acid relative to a total phosphoric acid, contains a low amount of free phosphate, and can be effectively utilized as a phosphate fertilizer.SOLUTION: A phosphate-containing solid is produced by reacting sewage sludge incineration ash and sulfuric acid under non-aqueous conditions to generate water-soluble or citrate-soluble phosphates,in which the quantities of the aforementioned sewage sludge incineration ash and sulfuric acid are controlled during this generation process to achieve a citrate-soluble phosphate ratio relative to a total phosphoric acid of the phosphate to be produced of 0.7 mass ratio or higher, and a free phosphate content of 8 mass% or less, and a manufacturing method thereof is provided.SELECTED DRAWING: Figure 1

The invention discloses an efficient fertigation decision support method and system for protected tomatoes, particularly relates to the technical field of agricultural precise irrigation, and is used for solving the problems of supply lag and resource waste caused by the fact that an existing balanced fertilizer supply mode cannot respond to a short-time fertilizer demand peak in a fruit expansion period. The method comprises the following steps: acquiring the fruit diameter and generating a phosphorus pulse starting signal when the fruit diameter reaches an expansion threshold value; synchronously measuring the thickness change gradient of the root surface ion diffusion boundary layer, and marking a boundary layer correction coefficient according to the abrupt change rate; simulating a rhizosphere microcosmic phase field to calculate curvature distribution of a phosphate diffusion path, and generating a phase field topological entropy value; on the basis of a phosphorus pulse starting signal, a phase field topological entropy value and a boundary layer correction coefficient, calculating an optimal phosphate fertilizer injection time point through a quotient query conversion table; and a phosphate fertilizer injection instruction containing a fertilizer code is output to the drip irrigation execution device at the optimal time point, so that the soil nutrient immobilization loss is effectively reduced.