209results about "Fertilisers by pryogenic processes" patented technology

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

The invention discloses a water and fertilizer management method for transplanted high-yield indica type two-line hybrid rice, and belongs to the technical field of rice cultivation. Comprising the following steps: (1) applying citric acid chelated calcium magnesium phosphate fertilizer to soil before transplanting; (2) applying coated controlled-release urea and a silicon-zinc fertilizer on the third day after transplanting; (3) when the tiller number reaches 2650,000-2750,000 plants / hm < 2 >, starting intermittent light field drying for three times, and deeply applying potassium magnesium sulphate before field drying; (4) laterally and deeply applying urea and a boron-humic acid chelate when tips of two inverted leaves are exposed; (5) spraying an aqueous solution in a full heading stage, wherein the aqueous solution comprises monopotassium phosphate, chelated zinc and brassinolide. Through staged precise fertilization, special chelating / controlled release fertilizer and water and fertilizer-field drying cooperation, the method has the advantages that the fertilizer utilization rate is increased, the nutritional requirements of rice in each growth period are precisely matched, and water and fertilizer cooperative management is optimized.

The invention belongs to the technical field of fertilizers. The invention discloses a method for preparing a polymerized calcium-magnesium fertilizer by using yellow phosphorus slag, and aims to solve the technical problems that the pH value of the yellow phosphorus slag as a fertilizer raw material is too high, and effective calcium, magnesium and silicon elements of the yellow phosphorus slag are difficult to utilize. A product obtained by reaction of the yellow phosphorus slag and the raffinate acid is used as a raw material, and phosphorus, calcium and magnesium elements in the phosphoric acid slag and the yellow phosphorus slag are fully utilized to form phosphorus, calcium and magnesium elements in a polymerization state. In terms of P2O5, the polymerization rate of the polymerized calcium-magnesium fertilizer is greater than or equal to 80%. Phosphorus in the prepared product has a slow release property, when the product is applied to soil, the phosphorus in the product cannot be rapidly fixed but slowly releases orthophosphate to meet the requirements of crops, magnesium and calcium are not prone to being greatly leached by water due to the action of polyphosphoric acid, and the product is especially suitable for crops with high requirements for calcium and magnesium.

A granular cohered MOP fertilizer having one or more micronutrients, and one or more binding ingredients. The fertilizer is prepared by compacting MOP feed material with a source of zinc and one or more optional binders to form a cohered MOP composition. The cohered MOP composition is then further processed, such as by crushing and sizing, to form a cohered granular MOP product containing a source of zinc. The process yields a fertilizer product containing micronutrients with superior elemental and granule size distribution without compromising handling or storage qualities.

The invention relates to the technical field of fertilizers, and discloses a fertilizer for promoting fruit swelling and color changing of crops and a preparation method thereof, the fertilizer comprises a first-stage material, a second-stage material, a modified residue material, a complex microbial inoculant, nutrient soil and humus soil; the fertilizer prepared by the invention can strongly improve the fruit quality, promote rapid expansion and coloring of young fruits, and is beneficial for increasing the sugar degree of the fruits, so that the taste of the fruits is improved, the fruits are large in size, bright in appearance and excellent in taste quality, and the income is increased.

The invention discloses a leaf surface resistance and control method for reducing heavy metal pollution, and belongs to the technical field of heavy metal pollution control, and the method specifically comprises the following steps: mixing sulfydryl modified collagen, tobacco extract, ferric sodium ethylene diamine tetraacetate, manganese sodium ethylene diamine tetraacetate, sugar alcohol silicon original liquid fertilizer, sodium selenite and deionized water to obtain a leaf surface resistance and control agent; according to the method, the composition of the leaf surface resistance and control agent is optimized, the leaf surface resistance and control agent is sprayed in three key growth stages including the tillering stage, the flowering stage and the filling stage of the rice, and the alkaline base fertilizer is used for assisting in adjusting the soil pH and water irrigation field management, so that the heavy metal stress resistance of the rice is improved, and the growth and development of the rice are promoted; the heavy metal content in the rice is reduced, the quality of the rice is improved, and the yield of the rice is improved.

The invention relates to the field of potato planting, in particular to a preparation method of a safe seed dressing agent for seed potatoes and a seed dressing method.The potato seed dressing agent is prepared by mixing a calcium magnesium phosphate fertilizer, 50% carbendazim wettable powder, 3% Zhongshengmycin wettable powder, 80% mancozeb wettable powder and a slow release component, and the seed potatoes are cut into blocks for seed dressing. The method can safely and efficiently prevent and treat diseases such as soft rot, bacterial wilt and wilt of potatoes, reduces the rotting rate of potato blocks, improves the emergence rate, yield and quality of potatoes, and is simple to operate, easy to master and suitable for large-scale popularization and application.

The invention discloses a crop yield increasing method based on Fen liquor vinasse biochar-based organic fertilizer, which comprises the following steps: S1, mixing pretreated pig manure and Fen liquor vinasse biochar in a mass ratio of (3: 1)-(4: 1) to obtain a mixed material; and S2, adding a composite fermentation inoculant accounting for 0.5-2% of the total mass of the mixed material into the mixed material, and carrying out mixed fermentation to obtain the charcoal-based organic fertilizer based on the Fen liquor vinasse. The invention further discloses the charcoal-based organic fertilizer based on the Fen liquor vinasse. The invention further discloses a crop yield increasing method based on the Fenyang wine vinasse biochar-based organic fertilizer. According to the biochar-based organic fertilizer based on the Fen liquor vinasse, the preparation method and the crop yield increasing method, the problem that the existing biochar-based organic fertilizer is difficult to extract and utilize the Fen liquor vinasse is solved.

The invention relates to a synergistic biological prevention and control double-effect regulation compound fertilizer applicable to corn and a preparation method, and the synergistic biological prevention and control double-effect regulation compound fertilizer applicable to corn is prepared from the following raw materials in parts by mass: 15-20 parts of urea, 10-15 parts of controlled-release nitrogen fertilizer, 8-12 parts of monoammonium phosphate, 5-8 parts of calcium magnesium phosphate fertilizer, 10-15 parts of potassium sulfate, 1-2 parts of zinc sulfate, 0.5-1 part of boric acid and 0.2-0.5 part of ammonium molybdate. According to the invention, through the synergistic effect of the microbial agent and the Chinese herbal medicine extract, the effect of biological prevention and control is achieved, the use of chemical pesticides is reduced, and the risk of pesticide residues in corn is reduced.

The present application relates to a kind of plum cultivation method of two harvests in a year, comprising the following steps: (1) culture plum spring shoot forms flower bud;(2) after two fruit harvest, water and fertilizer A is removed, summer pruning, control shoot;(3) remove leaf, winter pruning and apply base fertilizer;(4) root water and fertilizer B, germination;The flower of first fruit opens on the spring shoot;(5) in early February of next year, the flower of two fruit opens on the short fruit branch and flower bouquet fruit branch of the plum;4 in mid-April to mid-May, the first fruit matures;After the first fruit harvest, water and fertilizer C is removed, and the second fruit matures from mid-June to early July.The plum of the present application is two harvests in a year, and the total yield of two harvests (fruit) increases by 30.26%-52.50%, the first fruit matures 1-2 months earlier than normal, and the selling price increases by 3.29-4.36 times, the output value increases by 2.38-3.12 times, while adjusting the plum market supply in off-season, lengthening the shelf life of plum, improving the value of plum, thus better economic benefits are generated.

The invention discloses a fertilizer for increasing soil fertility of a cassava field. The fertilizer is prepared by applying 1 / 2 nitrogen-phosphorus-potassium compound fertilizer to cassava carbon soil; the fertilizing amount of the nitrogen-phosphorus-potassium compound fertilizer is the optimal dosage, and the cassava carbon soil is surface soil of a cassava planting zone after the cassava in season is harvested and smoldering products of waste cassava stems and leaves and old seed stems. The invention further discloses a fertilizing method for increasing the soil fertility of the cassava field. The fertilizing method comprises the following steps: preparing the nitrogen-phosphorus-potassium compound fertilizer; preparing cassava carbon soil; 1 / 2 of chemical fertilizer is reduced on the basis of recommended nitrogen-phosphorus-potassium fertilizer application, and the cassava carbon soil is applied in a matched mode; the cassava carbon soil is spread in a planting area before cassava planting, and the nitrogen-phosphorus-potassium compound fertilizer is applied in holes at a time 45-60 days after cassava planting. The method is beneficial to the recovery and improvement of soil nutrients and biological fertility, the richness and diversity of rhizosphere soil bacteria and fungi are obviously increased, the microbial community structure is obviously improved, the abundance of carbon and nitrogen metabolism functional genes is obviously improved, the investment of chemical fertilizers is reduced, and the yield loss caused by continuous cropping of cassava is effectively eliminated.

The invention discloses a high-yield cultivation method for zanthoxylum armatum in a stony desertification area, and belongs to the technical field of economic forest cultivation. The invention discloses a high-yield cultivation method for zanthoxylum armatum in a stony desertification area. The method comprises the steps of soil preparation and pond digging, field planting, fertilization, fruiting branch culture, growth regulation, pest control, irrigation, harvesting and pruning, and garden cleaning and overwintering. According to the high-yield cultivation method for zanthoxylum armatum in the stony desertification area, zanthoxylum armatum is planted in the stony desertification area, soil and fertilizer conservation can be conducted on the land on the basis of ecological restoration, the scientific management level of farmer households can be improved, economic development of the area is promoted, and the ecological environment is protected.

The present invention relates to the technical field of agricultural cultivation, and particularly to a method for fertilizing the soil in a jackfruit orchard. This method mixes the original soil with branches and leaves for pre-decomposition of the branches and leaves, combines a composting agent and a nitrogen source for composting the branches and leaves, and then combines a tree-nourishing fertilizer with a specific ratio, effectively accelerating the composting speed of the branches and leaves, improving the soil fertility, promoting the absorption of nutrients by jackfruit leaves, and ultimately increasing the yield of jackfruit. In addition, this method can effectively reduce the labor force and the dosage of commercial organic fertilizer, and has the advantages of easy operation, low cost, convenient implementation, and low requirements for technical conditions. Compared with centralized pulverization and decomposition, the labor force can be significantly reduced, and the dosage of commercial organic fertilizer can be reduced by more than 10%; compared with the methods of centralized incineration and direct stacking on the ground surface, the soil organic matter and nutrients are significantly improved, and the soil pH, microbial and nematode diversities are all significantly increased, and greenhouse gas emissions can also be reduced, which plays an important role in maintaining a healthy agricultural ecological environment.

The invention discloses a soil conditioner for an acidified sugarcane field. The soil conditioner is prepared from the following components in parts by weight: 40-70 parts of waste papermaking pulp, 0.03-0.05 part of a fermented complex microbial inoculant, 10-20 parts of mineral clay, 20-30 parts of organic matter fertilizer, 10-20 parts of inorganic fertilizer and 3-5 parts of wood vinegar, the preparation method of the soil conditioner comprises the following steps: adding the fermentation complex microbial inoculant into the organic matter fertilizer, uniformly stirring, stacking in a reaction tank, and turning 2-4 times every day when the placement temperature reaches 60-65 DEG C for 10-20 days; and then adding the waste papermaking pulp, the inorganic fertilizer, the mineral clay and the pyroligneous liquor, and uniformly stirring to obtain the soil conditioner. The method can solve the problem of soil acidification of a sugarcane field, reduce hardening of acidified soil, improve the air permeability of the soil, improve the microbial activity and reduce aluminum and manganese toxicity, thereby improving the yield and quality of sugarcanes.

The invention belongs to the field of liquid fertilizers, and particularly relates to a method for promoting bright colors of flowers by using a lincomycin finished product liquid fertilizer, which comprises the following steps: diluting lincomycin dry powder according to a mass ratio of 1: 100 to obtain a lincomycin finished product liquid; the method comprises the following steps: carrying out aerobic culture in a liquid culture medium containing starch, yeast powder, soybean meal, yeast extract and inorganic salt, supplementing ammonium ions in the lincomycin fermentation process, and controlling the fermentation time to be 36-110 hours, so as to obtain lincomycin fermentation liquor; dissolving urea, potassium chloride, zinc sulfate and the iron fulvic acid solution in water, and uniformly mixing to prepare a nutrient solution; the method comprises the following steps: treating zeolite with the fineness of 200 meshes at a high temperature of 200 DEG C; airing or drying the zeolite until the water content of the zeolite is reduced to be not higher than 5%; according to the lincomycin finished product liquid fertilizer disclosed by the invention, the flowering period is effectively prolonged, so that the bright color effect of flowers is promoted.

The invention relates to the technical field of sludge calcination, in particular to a method for regulating and controlling a phosphorus phase in a sludge calcination product by utilizing kaolinite. The invention discloses a method for regulating and controlling a phosphorus phase in a sludge calcined product by utilizing kaolinite. The method comprises the following steps: calcining a mixture of kaolinite and sludge in a certain proportion at 600-700 DEG C for 2-4 hours; in the mixture, the mass ratio of kaolinite is 8-10%. The kaolinite is added to be pyrolyzed and calcined with the sludge, under the synergistic effect of proportion, temperature and the like, phosphorus phase reconstruction in the calcined sludge product is regulated and controlled, the total phosphorus (TP) preservation amount is increased, and phosphorus in the sludge is converted into a form which has higher recovery value, higher bioavailability and is easier to extract subsequently, especially apatite-state phosphorus (AP); the phosphate fertilizer is stable in chemical property and moderate in solubility, and is a source of high-quality phosphate fertilizer or phosphorus chemical raw materials.

The claimed invention relates to a process for the treatment of a material comprising one or more phosphate compounds with low solubility in water, wherein the process comprises the steps of: i) introducing said material comprising one or more phosphate compounds, an alkali metal compound and an organic material as feed materials into a reactor, and ii) heating these feed materials at 750-1100 °C, preferably 850-1000 °C.

There is provided a method for producing ferrous sulphate and phosphoric acid comprising treating ferrous phosphate with sulphuric acid for obtaining ferrous sulphate and phosphoric acid. Additionally, there is provided a use of sulphuric acid for treating ferrous phosphate for obtaining ferrous sulphate and phosphoric acid.

The invention belongs to the field of liquid fertilizers, and relates to a process for promoting the growth of commercial crops by using a lincomycin finished product liquid fertilizer, which comprises the following steps: diluting lincomycin dry powder according to a mass ratio of 1: 100 to obtain a lincomycin finished product liquid; the fertilizer is prepared from a modified accelerant, urea, monopotassium phosphate, calcium superphosphate, a calcium magnesium phosphate fertilizer, potassium chloride, zinc sulfate, borax, an iron fulvate solution, paclobutrazol and lincomycin fermentation liquor. Dissolving urea, potassium chloride, zinc sulfate and the iron fulvic acid solution in water, and uniformly mixing to prepare a nutrient solution; performing 200-DEG C high-temperature treatment on zeolite with the fineness of 200 meshes, and spraying the nutrient solution onto the zeolite; airing or drying the zeolite until the water content of the zeolite is reduced to be not higher than 5%; and uniformly mixing the residual chemical fertilizer with the modified accelerant to obtain the lincomycin finished product liquid fertilizer. The lincomycin finished product liquid fertilizer provided by the invention can improve the growth of crops.

The present invention relates to the field of solid waste resource utilization and environmental engineering technology, and specifically to a method for recovering phosphorus based on wetland plant cyclic hydrothermal carbonization, comprising the following steps: (1) washing and drying the harvested wetland plants, crushing and screening; (2) taking biomass powder for hydrothermal carbonization treatment to obtain hydrothermal carbonization products; (3) performing solid-liquid separation on the obtained carbonization products; (4) continuing to utilize the obtained carbonized liquid as a liquid phase medium, mixing biomass raw materials for multi-stage cyclic hydrothermal carbonization, and after the cyclic carbonization is completed, performing solid-liquid separation to obtain phosphorus-rich carbonized liquid and cyclic hydrothermal charcoal; (5) by adjusting the pH of the phosphorus-rich carbonized liquid, phosphorus crystal precipitation is formed and recovered. The present invention realizes effective recovery of phosphorus in wetland plants, and at the same time realizes resource utilization of hydrothermal carbonization products of wetland plants, reduces the impact of hydrothermal carbonization of biomass waste on the environment, and effectively solves the problem of wetland plant residue treatment and disposal.

The invention belongs to the technical field of soil improvement, and discloses a soil conditioner with an acidified soil improving function and a preparation method thereof. The conditioner is prepared from biomass charcoal, peat containing humic acid, crab shells, eggshells, clamshells, bamboo charcoal, zeolite powder, kieselguhr, biogas residues, potassium fulvate, calcium magnesium phosphate fertilizer, animal waste and a microbial agent according to the mass percent. The invention relates to the technical field of soil improvement. The modifier realizes a multi-dimensional synergistic effect through alkaline neutralization, humus buffering, slow-release fertilizer supply and microbial activation, can significantly improve the pH value of acidified rice field soil after one-time application, increases 0.6-1.0 unit, effectively increases the contents of soil organic matters, total nitrogen, available phosphorus and available potassium, improves the soil structure and microbial activity, and improves the soil quality. And the yield of rice is increased by about 10% or above. The method is suitable for soil improvement and green agricultural production of southern acidic rice fields.

The disclosure relates to the extraction of phosphorus, comprising the following steps: providing a starting material (201) comprising a phosphorus-containing material, gasifying the starting material (202) by plasma gasification in an oxygen-deficient environment, thereby forming gaseous elements comprising phosphorus and / or phosphorus oxides, cooling the gaseous elements (203), adding a predetermined amount of water (204) to the gaseous elements to form a solution in which the phosphorus oxides are dissolved in phosphoric acid and / or phosphonic acid, separating the phosphorus from the phosphoric acid and phosphonic acid (205) and collecting the separated phosphorus in a first container, separating the remaining phosphorus and phosphorus compounds (206) from the solution and collecting the remaining phosphorus and phosphorus compounds in a second vessel.The disclosure also relates to a system for extracting phosphorus according to the method.

Carbon-negative fertilizers and methods for making and using the same are provided. Aspects of the methods include reacting rock phosphorus with sulfuric acid (H2SO4) to produce phosphoric acid (H3PO4) and phosphogypsum (CaSO4•2H2O); converting the phosphogypsum to a calcium carbonate-containing solid product and thereby generating an aqueous sulfate; electrolyzing the aqueous sulfate to produce hydrogen (H2); synthesizing ammonia (NH3) from the hydrogen; and producing an ammonium salt from the ammonia. Also provided are systems for practicing the methods, as well as fertilizers produced by the methods.

The invention discloses a soil conditioner suitable for riverside plains and a fertilizer containing the soil conditioner, in the technical field of functional fertilizers. A porous, high-strength hard biochar is obtained by carbonizing high-strength coconut fiber and macroporous adsorption resin, the strength of the biochar as a matrix is ​​improved, magnetic ferroferric oxide is hydrothermally synthesized on the surface of the biochar through carboxyl groups, and a porous skeleton centered on lanthanum is further synthesized to fix lanthanum and magnetic ferroferric oxide, thereby improving the adsorption of heavy metals; the resin is interspersed in the magnetic porous lanthanized biochar, and the introduction of the large specific surface area of ​​the resin can expand the pore size distribution and provide more adsorption sites. The resin itself has viscosity and water absorption. When interspersed in the biochar, the binding force between the biochar and soil particles can be further enhanced, which is helpful to stabilize the soil structure and reduce the loss of soil water.

The invention discloses a method for producing a high-phosphorus-content calcium magnesium phosphate fertilizer by using an industrial byproduct magnesium ammonium phosphate, which comprises the following steps: drying and screening magnesium ammonium phosphate, adding phosphorite, dolomite or serpentine and coke or anthracite, feeding the materials into a smelting furnace according to a ratio, melting and smelting at a high temperature, blowing air or oxygen by an air blower at the smelting temperature of 1400-1600 DEG C for 2-3 hours, and cooling to room temperature to obtain the high-phosphorus-content calcium magnesium phosphate fertilizer. The smelting time is 0.5-4 hours, discharging molten slag from a slag opening of the smelting furnace, and carrying out water quenching to obtain the calcium magnesium phosphate fertilizer; gas generated in the process enters a hot-blast stove along with smelting furnace gas, at the moment, the temperature of a hearth of the hot-blast stove reaches 900-1000 DEG C due to gas combustion, and ammonia reacts with nitrogen oxide in the tail gas to obtain nitrogen and water, and reacts with sulfur dioxide to finally obtain ammonium bisulfate. According to the invention, resource utilization of the industrial byproduct magnesium ammonium phosphate can be realized, the calcium magnesium phosphate fertilizer with high phosphorus content can be obtained, and nitrogen oxides and sulfur dioxide in the tail gas in the production process of the calcium magnesium phosphate fertilizer can be more effectively removed.

The invention belongs to the field of organic fertilizers, and particularly relates to a sheep manure organic fertilizer for improving mango quality and application thereof. The sheep manure organic fertilizer disclosed by the invention not only has a certain promotion effect on mango branch tip growth, flower formation promotion and the like, but also has a good effect on soil improvement and tree nutrient accumulation, improves soil hardening caused by long-term application of chemical fertilizer in a mango garden, improves soil fertility, maintains sustainable productivity, and has a good application prospect. The mango yield is continuously improved. The sheep manure organic fertilizer provided by the invention can improve soil fertility and ecology, can continuously improve mango yield and mango quality, has multiple positive influences on the mango industry, and provides a new technical scheme for promoting sustainable development of the mango industry and improving quality and efficiency of the mango industry.

The invention belongs to the technical field of harmless treatment and resource utilization of municipal sludge, and particularly relates to a method for preparing a sludge-based phosphorus-rich biochar material through Fenton modification. Aiming at the problems of low phosphorus fixation rate, high heavy metal leaching risk and the like in sludge treatment in the prior art, the method comprises the following steps: performing Fenton modification on sludge according to a TOC (Total Organic Carbon) value, and performing pyrolysis and calcination on the modified sludge at 500 DEG C and 700-900 DEG C in sequence to obtain the phosphorus-rich biochar. The heavy metal leaching rate of the phosphorus-rich biochar prepared by the method is greatly reduced, meanwhile, the phosphorus fixation rate is increased, and the method has remarkable progress.

The present invention relates to the technical field of solid waste resource utilization and environmental engineering, and in particular to a method for recovering phosphorus based on cyclic hydrothermal carbonization of wetland plants, comprising the following steps: (1) washing, drying, then crushing and sieving harvested wetland plants; (2) taking biomass powder for hydrothermal carbonization treatment to obtain a hydrothermal carbonization product; (3) performing solid-liquid separation for the obtained carbonization product; (4) continuing to use the obtained carbonization liquid as a liquid-phase medium and mixing with the biomass raw material for multi-stage cyclic hydrothermal carbonization; after the cyclic carbonization is ended, conducting solid-liquid separation to obtain phosphorus-rich carbonization liquid and cyclic hydrochar; and (5) adjusting the pH of the phosphorus-rich carbonization liquid to form and recover phosphorus crystal precipitates. The present invention effectively recovers phosphorus from the wetland plants, simultaneously realizes the resource utilization of the hydrothermal carbonization product of the wetland plants, reduces the impact of hydrothermal carbonization of biomass waste on environment, and effectively solves the problems of treatment and disposal of wetland plant residues.

The application relates to an acidified soil conditioner and a preparation method, and belongs to the technical field of soil conditioners. The acidified soil conditioner is prepared from the following raw materials in parts by weight: bacillus subtilis 10-15 parts, EM bacteria 10-15 parts, ethylhexyl glycerin 20-30 parts, chitin 3-8 parts, sodium tripolyphosphate 10-15 parts, calcium-magnesium phosphate fertilizer 25-35 parts, allantoin 12-15 parts, modified oyster shell 20-30 parts and modified beer lees 35-45 parts. The soil conditioner can improve soil acidity, increase the pH value, increase the content of organic matter and other nutrient components, reduce the content of heavy metals, is beneficial to crop growth, and improves the quality and yield of crops.

The invention belongs to the technical field of compound fertilizers, and particularly relates to a compound fertilizer for improving the quality and yield of avocado fruits and a preparation method of the compound fertilizer. The compound fertilizer for improving the fruit quality and yield of avocados is prepared from the following raw materials: urea, a calcium magnesium phosphate fertilizer, potassium sulfate, magnesium chloride, corn straw, livestock manure, plant ash, fulvic acid, bacillus subtilis and soybean meal and corn germ meal composite enzymatic hydrolysate, wherein the soybean meal and corn germ meal composite enzymatic hydrolysate is a papain directional enzymatic hydrolysate. When the fertilizer is used for planting avocados, the quality and yield of the avocados can be remarkably improved.