281 results about "Phosphate fertilizer" patented technology

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 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 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 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 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 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.

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.

The invention relates to a composite phosphate solubilizing bacterium agent based on biochar carriers and a preparation method and application thereof.The composite phosphate solubilizing bacterium agent can effectively improve the phosphorus absorption and utilization rate of plants in the growth process, and by immobilizing inorganic phosphorus dissolving bacteria on different types of biochar carriers, the yield of the plants is improved more remarkably. The method has the advantages that the method can be used for improving the efficiency of phosphorus in barren soil, reducing dependence on chemical phosphate fertilizer and improving the efficiency of soil phosphorus and phosphorus absorption of crops, especially phosphorus absorption capacity and growth performance of oilseed rape, has a wide agricultural application prospect, and is a method for realizing more environment-friendly and sustainable agricultural production, and the method is particularly used for improving the efficiency of phosphorus in barren soil, reducing dependence on chemical phosphate fertilizer and improving the efficiency of soil phosphorus and phosphorus absorption of crops.

The invention relates to the technical field of materials and metallurgy, in particular to a method for obtaining ferro-nickel alloy by smelting laterite type nickel ore, which comprises the following steps: carrying out compression molding on a batch of the laterite type nickel ore to obtain pellets, calcining the pellets in a vertical calcining furnace to obtain metallized pellets, and smelting and separating the metallized pellets to obtain ferro-nickel alloy and slag; nodules can be eliminated in the reduction roasting stage, meanwhile, the use amount of air can be reduced, the exhaust gas emission temperature is lowered, and therefore the heat efficiency is improved. The slag is ground and separated into slag particles and slag powder, the slag particles are rich in metal elements, the slag particles are extracted to serve as return mine and participate in batching again, the metal recovery rate is increased, and the slag powder can be used as superfine slag powder. Besides, if the slag is subjected to remelting and component adjustment, cement or steel slag phosphate fertilizer can be obtained in the ferronickel production process and is used for replacing the superfine slag powder, and resource waste is further avoided.

The invention relates to a magnesium modified sludge-based phosphorus-rich biochar material and a preparation method thereof, and belongs to the technical field of harmless treatment and resource utilization of municipal sludge. The invention provides a magnesium-modified sludge-based phosphorus-rich biochar material and a preparation method thereof.The preparation method comprises the following steps that municipal sludge is heated and dried, and sludge particles are obtained after treatment; pyrolyzing the sludge particles, and cooling to obtain sludge semicoke; adding a magnesium-based additive into the sludge semi-coke, heating and calcining in a nitrogen atmosphere, and cooling to obtain the phosphorus-rich biochar. According to the phosphorus-rich biochar prepared by the method, the harm caused by mass production and accumulation of municipal sludge is solved, a large amount of phosphorus element is enriched, and the phosphorus-rich biochar prepared by the method can replace phosphate fertilizer to be applied to grassland gardens or replace phosphorite to be exploited as a phosphate ore source; and the environment damage and resource waste caused in the phosphorite mining and phosphate fertilizer production process are reduced on the whole.

The invention belongs to the field of inorganic chemical industry, and particularly relates to a method and a system for efficiently utilizing a phosphate fertilizer byproduct, the method comprises the following steps: carrying out acidolysis on fluosilicic acid with the concentration of more than or equal to 45% wt and concentrated sulfuric acid to generate a mixed solution of silicon tetrafluoride gas and fluorosulfonic acid; the mass ratio of the fluosilicic acid to the concentrated sulfuric acid is controlled to be 1: (4-15); pyrolyzing the obtained fluorosulfonic acid to generate dilute sulphuric acid, hydrogen fluoride and water vapor, forming 98% concentrated sulphuric acid from part of dilute sulphuric acid and fuming sulphuric acid, drying hydrogen fluoride to obtain crude hydrogen fluoride gas, and condensing and rectifying to obtain anhydrous hydrogen fluoride; the rest dilute sulphuric acid is partially compounded and then returned for acidolysis, and the rest dilute sulphuric acid is used for producing white carbon black and flows back to a wet-process phosphoric acid system; and circularly absorbing the obtained silicon tetrafluoride gas by using secondary concentrated fluosilicic acid to obtain fluosilicic acid with the mass concentration of more than or equal to 45%, recycling the fluosilicic acid for acidolysis reaction, and modifying the concentrated by-product silicon dioxide to obtain the high-activity white carbon black. The problems of energy consumption and cost are solved, and efficient circulation and poly-generation of fluorine and silicon resources are achieved in the whole process.

The invention discloses a preparation method of a stabilized fertilizer and granulation equipment for production, and relates to the technical field of fertilizer production, and the preparation method comprises the following steps: heating a nitrogen fertilizer in a melting tank to a molten state, and sequentially adding a crushed potash fertilizer, a crushed phosphate fertilizer, a crushed trace element fertilizer and a nitrification inhibitor into the melting tank to obtain a molten mixed fertilizer; feeding the molten-state mixed fertilizer to a high-tower granulation device to obtain an inner core; polylactic acid, acetone, alginate oligosaccharide, glycerin and starch are sequentially sent to a stirring kettle to be stirred and mixed, the mixture is sprayed to the outer wall of the cooled inner core, and an adhesion layer is formed on the outer wall of the inner core after drying; spraying the slurry to the surface of the adhesion layer, and then drying at low temperature to form a dormant bacterium layer on the outer wall of the adhesion layer; and spraying the coating solution to the outer wall of the dormant bacterium layer, and performing low-temperature cooling to obtain an outer coating layer. Therefore, through the combination of the inner core, the adhesion layer, the dormant bacterium layer and the outer coating layer, the fertilizer efficiency release rate is greatly slowed down, so that the fertilizer provided by the scheme can be more lasting and effective.

The invention discloses a preparation method and an application method of straw wet biochar for carbon sequestration and emission reduction in rice and wheat rotation. The preparation method comprises the specific steps of preparation and application of the straw wet biochar. The preparation method of the straw wet biochar comprises the steps of raw material preparation, low-temperature combustion, normal-temperature slow oxidation, electromagnetic radiation treatment, microwave heating and light wave sterilization, filtration and freezing and cold storage treatment. The method is mainly used for improving straw resource utilization of a rice and wheat system. The preparation process is low in energy consumption and little in smoke dust, carbon volatilization in the straw is reduced, and the content of fixed carbon in the straw is greatly increased. According to the specific application, the compound fertilizer is mixed with fertilizer according to a certain weight ratio of the compound fertilizer to plough layer rice soil and then applied at a time during rice planting. Wherein the nitrogen fertilizer is a mixture of quick-acting urea nitrogen and slow-release urea nitrogen, and the phosphate fertilizer and the potash fertilizer are conventional fertilizers. The fertilizer can promote the increase of gaps in rice soil and the water retention of wheat soil, reduces the emission of N2O, CO2 and CH4 in the rice and wheat planting process after being applied, improves the organic carbon content of soil, reduces the emission of greenhouse gas carbon (CO2), and promotes the increase of the crop rotation yield of rice and wheat.

The invention belongs to the technical field of compound fertilizers, and particularly relates to a mineral source nitro-humic acid complex phosphate fertilizer for treating land salinization and a preparation method of the mineral source nitro-humic acid complex phosphate fertilizer. Comprising the following components in parts by weight: 50-80 parts of mineral source nitro humic acid, 5-20 parts of calcium superphosphate, 1-5 parts of a soil conditioner, 1-3 parts of trace elements, 5-15 parts of biochar, 0.5-2 parts of a complex microbial inoculant and 3-8 parts of a coating material.

The utility model relates to the technical field of phosphorite treatment, in particular to a device and system for preparing ammonium phosphate and byproduct nitrophosphate fertilizer by decomposing phosphorite with nitric acid. The device comprises an acidolysis tank, the acidolysis tank is connected to a first separator, the first separator is connected to a first crystallizer, the first crystallizer is connected to a second separator, the second separator is connected to a decalcification tank, the decalcification tank is connected to a denitration tank, and the denitration tank is connected to a second crystallizer. The denitration tank is respectively connected to the repulping tank and the purification equipment; the re-pulping tank is connected to a neutralizing tank, and the neutralizing tank is connected to a first concentrator; and the purification equipment is connected to the second concentrator. According to the device disclosed by the invention, the mother liquor generated by the acidolysis tank is deeply processed to prepare monoammonium phosphate and purified phosphoric acid, meanwhile, a byproduct white fertilizer can be processed into a phosphorus (potassium) nitrate fertilizer, and a byproduct white gypsum is obtained.

The invention discloses a method for preparing a soil conditioner from ardealite and application of the soil conditioner, and belongs to the field of solid waste resource utilization. According to the method, the preparation process is simple, effective utilization of the phosphogypsum can be achieved, and effective resource utilization of the phosphogypsum is achieved through calcination pre-activation, reasonable burdening and functional mixed bacteria fermentation. The prepared product is high in activity when being used as a liquid biological phosphate fertilizer, the yield of lettuce can be obviously increased only through a leaf surface spraying mode, thallium and beryllium pollutants in polluted soil can be effectively passivated when the product is used as a soil conditioner, the thallium leaching concentration is lower than 2.11 * 10 <-3 > mg / L, and the beryllium leaching concentration is lower than 3.02 * 10 <-3 > mg / L.

The group of inventions relates to the chemical industry, and more particularly to the production of nitrogen fertilizers, and can be used for producing granules of fertilizers such as, inter alia, ammonium nitrate, urea and ammonium nitrate-phosphate fertilizers, by prilling. What is proposed is a method for forming nitrogen fertilizer granules by prilling using a closed air circulation loop, in which cooling air is fed into the lower part of a prilling tower, a nitrogen fertilizer melt is sprayed into the upper part of the prilling tower, and granules are removed from the lower part of the tower. By means of at least one closed circulation loop, air is removed from the upper part of the prilling tower for preparation by purification and cooling and is returned to the lower part of the prilling tower as cooling air, wherein before being returned to the prilling tower, at least a portion of the air is sent for additional preparation by aftercooling, with the separation and removal of condensate and subsequent warming of the air. Also proposed is an apparatus for carrying out the claimed method. The technical result of the group of inventions consists in increasing the efficiency of a prilling process entailing a closed loop for the circulation of cooling air by improving the quality of the fertilizer produced, increasing operational reliability and reducing the overall dimensions of the equipment used, while maintaining a complete absence of prilling process emissions and obviating the need for the inspiration of external air.

The embodiment of the application provides a calcium superphosphate chemical conversion device capable of improving stirring rate, and relates to the technical field of phosphate fertilizer processing. The device comprises a mixing tank, a feeding port is arranged at the top end of the mixing tank, a first motor is arranged at the center position of the top end of the mixing tank, a rotating shaft is fixedly arranged on one side of the first motor, a first gear is fixedly arranged on one side of the rotating shaft, second gears are symmetrically and meshingly connected on the two sides of the first gear, and rotating rods are fixedly arranged on one side of the two second gears. Through the operation of the first motor, the rotating shaft is driven to rotate, the two second gears on the two sides are driven to rotate through the meshing of the first gear, and then the rotating rods are driven to rotate, the first stirring rod, the L-shaped rod and the second stirring rod are driven to synchronously rotate, the coverage area is improved through the first stirring rod, the L-shaped rod and the second stirring rod, and the stirring process is more uniform and efficient, and good sufficient stirring is achieved.

The invention provides a phosphorus release improving type compound fertilizer based on a fungal extracellular polymer, a preparation method and application, and belongs to the technical field of microorganisms, the phosphorus release improving type compound fertilizer is prepared by compounding the extracellular polymer generated by specific rhodotorula mucilaginosa WTSX01 and inorganic phosphate according to the mass ratio of 1: 9; the preparation method comprises the following steps: extracting and purifying high-activity EPS from a strain fermentation broth by a low-temperature dialysis method, separating lipid from EPS as a natural adhesive by a cosolvent extraction method, and finally mixing EPS, lipid and inorganic phosphate. The invention also discloses a synergistic application of the fertilizer and a phosphorus-solubilizing fungus aspergillus niger (CCTCC No. M2023240), so that the release efficiency of phosphorus in soil is improved; the fertilizer provided by the invention provides exclusive nutrition for phosphate-solubilizing microorganisms, effectively overcomes indigenous microorganism competition, remarkably promotes microorganism growth and phosphorus release, and realizes reduction and synergism of phosphate fertilizer and yield increase of crops.

The present application relates to the field of fertilizers, and in particular to a soil fertilizer containing fish enzymes and a preparation method thereof. A soil fertilizer containing fish enzymes, the raw materials of which include, by mass, 10 to 20 parts of fish enzymes, 30 to 50 parts of urea, 5 to 10 parts of polyglutamic acid complex, 5 to 10 parts of modified chitosan, 1 to 3 parts of humic acid, 1 to 3 parts of aminobutyric acid, 10 to 20 parts of inorganic metal compounds, 4 to 6 parts of phosphate fertilizers, 1 to 5 parts of binders, 4 to 10 parts of surfactants, and 50 to 80 parts of deionized water. The fish enzyme fertilizer prepared in the present application can not only significantly improve soil fertility, increase crop product quality, promote crop growth, and improve soil, but it is also different from existing enzyme / protein fertilizers and has excellent self-stability, thereby avoiding the technical problems of difficult storage, difficult transportation, and easy deterioration and inactivation of existing organic fertilizers of this type, and has excellent market prospects.

The invention discloses a planting method for delaying flowering and fruit setting of citrus, and belongs to the technical field of citrus planting. The planting method comprises the following steps that S1, autumn shoots are promoted to sprout and mature, before the autumn shoots sprout, existing branches are trimmed, nitrogenous fertilizer, phosphate fertilizer and potash fertilizer are applied, and 0.2-0.4% monopotassium phosphate and 200-300 ml / L paclobutrazol are sprayed after new shoots are self-trimmed; s2, spring shoot germination inhibition: before spring shoot germination, rain sheltering and water control are carried out, and soil drought is kept; s3, sprouting of early summer shoots is promoted, before sprouting of the early summer shoots, existing branches are trimmed, and nitrogenous fertilizer, phosphate fertilizer and potash fertilizer are applied; s4, fruit retention: spraying a fruit retention agent during the end-flowering period and after the first physiological fruit drop period. The method can delay the maturing and marketing time of citrus, and prolongs the fresh fruit supply period by about 90 days compared with a conventional planting mode.