CN108299131B - Multi-micro-oxygen fertilizer for fruit trees and preparation method thereof - Google Patents

Abstract

The invention discloses a fruit tree multi-micro-oxygen fertilizer and a preparation method thereof, wherein the fruit tree multi-micro-oxygen fertilizer is prepared from the following raw materials in parts by weight: 1-3 parts of hydrated zinc sulfate, 3-5 parts of hydrated sodium tetraborate, 0.1-0.5 part of hydrated ammonium molybdate, 8-10 parts of calcium magnesium phosphate fertilizer, 7-10 parts of coal powder, 30-40 parts of brown soil powder and 40-50 parts of calcium peroxide. The multi-micro oxygen fertilizer for the fruit trees can prolong the oxygen release time and provide various nutrient elements, is suitable for increasing oxygen for ponded soil and slowly increasing oxygen in deep soil, widens the application range of the oxygen fertilizer, realizes deep oxygen increase of the soil, and has important application value.

Description

Multi-micro-oxygen fertilizer for fruit trees and preparation method thereof

Technical Field

The invention relates to the technical field of fruit tree fertilizer production and processing and fertilization, in particular to a fruit tree multi-micro-oxygen fertilizer and a preparation method thereof.

Background

The 'gas' is one of four major elements forming the soil fertility, and poor ventilation can limit the gas exchange of the soil, reduce the oxygen concentration of the soil, influence the nutrient conversion of the soil, inhibit the respiration of root systems, limit the absorption and utilization of the root systems to nutrients, be not beneficial to the healthy growth of plants, the formation of crop yield and the like. The method can also cause hypoxia stress to plants, start anaerobic respiration, reduce the efficiency of energy production of the assimilates by the anaerobic respiration, generate a large amount of harmful reductive substances, influence the normal function of root systems, be not beneficial to plant growth and even cause plant death. Therefore, the implementation of the oxygenation measures of loosening the soil, oxygenating and irrigating, applying solid oxygen fertilizer and the like can promote the growth and development of plants, improve the yield of crops and improve the quality of the crops.

The aim of oxygen increasing is mainly to promote the absorption of roots to soil nutrients, but sometimes the oxygen increasing effect in an orchard is not obvious, and even the fruit trees have physiological diseases such as lobular disease, leaf yellowing, fruit shrinking disease and the like which lack trace elements. The method mainly comprises the steps that when the soil trace elements are not sufficient, oxygen is increased to promote root absorption, so that more major elements enter the fruit tree body, the trace elements absorbed and accumulated in the fruit tree body are relatively less, the nutrient element balance is greatly damaged, and under the condition, the measures for promoting root absorption can cause and even aggravate the trace element deficiency. Therefore, while the nutrient absorption of the root system is promoted by the oxygenation of the soil, the soil needs to be supplemented with trace elements. However, the prior art is often biased in one aspect, and the synergistic consideration of soil oxygenation and soil microelement supplement is not provided.

The soil is easy to lack oxygen when water is accumulated in the soil, and the deep layer of the soil is easy to lack oxygen. When the soil is excessively accumulated with water and particularly has waterlogging damage, the soil is more obviously damaged by oxygen deficiency and is more concerned, so that the conventional oxygen fertilizer is mainly designed for solving the waterlogging damage and is also mainly suitable for being applied to the soil in the waterlogging damage. However, in more cases, the soil has no accumulated water or waterlogging, and under the condition, the oxygen content of the upper layer of the soil is higher, but the deep layer of the soil is always in a state of insufficient oxygen, so that the root system is obviously limited from expanding to the deep layer; moreover, the deficiency symptoms such as fruit tree zinc deficiency lobular disease, iron deficiency leaf yellowing and boron deficiency fruit set are often caused when the air permeability of the deep soil layer is poor, so under the condition of normal water content, the deep soil layer needs to be oxygenated, but no oxygen fertilizer suitable for the deep soil layer exists at present.

The patent "a slow-release oxygen fertilizer and its preparation method" (application publication No. CN102924176A) needs to add chemical adhesive polyvinyl formal solution to make ointment, and also needs to carry out the processes of drying and moisture absorption, etc., the process is relatively complicated; the dosage of polyvinyl formal accounts for 15 percent, the mass ratio of sodium bentonite to calcium peroxide is 12:5, and the proportion of the oxygen-releasing effective component calcium peroxide in the finished product is lower (less than 36 percent); meanwhile, the polyvinyl formal and the sodium bentonite have larger consumption, so that the product cost is higher; and the polyvinyl formal needs to be prepared by deionization, which further increases the cost. The patent 'a slow-release oxygen fertilizer for olive in the fruit-bearing period and the preparation method thereof' (application publication No. CN107417416A) also has complex production process, and the component contains dimethylbenzene which belongs to carcinogen, and has safety risk to the environment, human body and plants in the production and use processes, and the proportion of the oxygen-release effective component in the finished product is lower (less than 20%). The patent of 'novel sustained and controlled release oxygen fertilizer' (application publication No. CN105884540A) needs special adhesive and paraffin wax to be pressed and wrapped, has higher cost and more complex process, does not give specific dosage of materials, and the specific dosage of the materials is very important to product forming and effectiveness. The patent 'an oxygen increasing fertilizer for nursery stock and a preparation method thereof' (application publication number: CN106747948A) mainly aims at the oxygen requirement of nursery stock, the process is complex, the chemical oxygen increasing agent which is an effective oxygen releasing component is less than 3%, and the oxygen increasing effect of soil can be effectively achieved only by applying a large amount of the oxygen increasing fertilizer. The patent 'an oxygen fertilizer and a preparation and application method thereof' (application publication number: CN102584466A) discloses a coated granular fertilizer, which is bonded and double-layer coated by sodium alginate, sodium tripolyphosphate, nano chitosan and paraffin, and has high material cost and complex production process; the outer package paraffin is a hydrophobic material, water molecules are difficult to permeate when the soil moisture content is low, the outer package paraffin is difficult to crack when the soil moisture content is not too high, and oxygen is difficult to release, so that the outer package paraffin is only suitable for the condition that the soil moisture is fully saturated, namely, flooding, is not suitable for oxygenating the soil with the low moisture content and oxygenating the deep layer of the soil with the normal moisture content, and has great limitation in application.

The existing oxygen fertilizers are granular fertilizers, mainly aim at soil waterlogging, do not consider the actual characteristics of orchard soil, and do not aim at the special requirements of fruit trees on trace elements. When the soil is ventilated badly, fruit trees often have nutrient deficiency, and particularly, the fruit trees are easy to have symptoms of minor leaf disease and the like caused by the deficiency of trace elements such as zinc and the like. The existing oxygen fertilizer is mainly used for simply increasing oxygen, and trace elements and the like are supplemented while the oxygen increase is not considered.

The preparation of the existing oxygen fertilizers requires the use of special adhesives, and the process is generally complicated. Moreover, the oxygen fertilizers can release oxygen well only by a large amount of liquid water, namely the oxygen fertilizers are mainly suitable for being applied to the surface layer or shallow layer of flooded soil; if they are applied to the deep layer of soil having a low water content, it is difficult or inefficient to release oxygen because of the low amount of liquid water.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a fruit tree multi-micro oxygen fertilizer and a preparation method thereof. The multi-micro oxygen fertilizer for the fruit trees can prolong the oxygen release time and provide various nutrient elements, is suitable for increasing oxygen for ponded soil and slowly increasing oxygen in deep soil, widens the application range of the oxygen fertilizer, realizes deep oxygen increase of the soil, and has important application value.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides a fruit tree multi-micro-oxygen fertilizer, which is prepared from the following raw materials in parts by weight:

1-3 parts of hydrated zinc sulfate, 3-5 parts of hydrated sodium tetraborate, 0.1-0.5 part of hydrated ammonium molybdate, 8-10 parts of calcium magnesium phosphate fertilizer, 7-10 parts of coal powder, 30-40 parts of brown soil powder and 40-50 parts of calcium peroxide.

Preferably, the fruit tree multi-micro-oxygen fertilizer is prepared from the following raw materials in parts by weight:

2 parts of hydrated zinc sulfate, 4 parts of hydrated sodium tetraborate, 0.2 part of hydrated ammonium molybdate, 9 parts of calcium magnesium phosphate fertilizer, 8 parts of coal powder, 35 parts of brown soil powder and 45 parts of calcium peroxide.

Further preferably, the particle size of the pulverized coal is less than or equal to 90 μm; more preferably 75-90 μm.

Further preferably, the grain diameter of the brown soil powder is less than or equal to 250 mu m; more preferably 180-250 μm.

Further preferably, the hydrated zinc sulfate is zinc sulfate heptahydrate, the hydrated sodium tetraborate is sodium tetraborate decahydrate, and the hydrated ammonium molybdate is ammonium molybdate tetrahydrate.

The second aspect of the invention provides a preparation method of the fruit tree multi-micro oxygen fertilizer, which comprises the following steps:

mixing hydrated zinc sulfate, hydrated sodium tetraborate, hydrated ammonium molybdate, calcium magnesium phosphate fertilizer, coal powder and brown soil powder, adding calcium peroxide, and uniformly mixing; and then pressing and forming the uniformly mixed materials to obtain the material.

According to the invention, hydrated zinc sulfate, hydrated sodium tetraborate, hydrated ammonium molybdate, calcium magnesium phosphate fertilizer, coal powder and brown soil powder are mixed firstly, and then calcium peroxide is added for mixing, so that the hydrated zinc sulfate, the hydrated sodium tetraborate and the hydrated ammonium molybdate are mixed with the calcium magnesium phosphate fertilizer, the coal powder and the brown soil powder firstly to reduce or avoid the generation of liquid water as far as possible in order to avoid the reaction of the hydrated zinc sulfate, the hydrated sodium tetraborate and the hydrated ammonium molybdate and the calcium peroxide in consideration of the fact that the calcium peroxide is easy to react when meeting water.

Preferably, the uniformly mixed materials are pressed into a sheet or a cylinder with the diameter of 1.5-4.0cm and the height of 0.5-4.0 cm; or pressing into spherical shape with diameter of 1.5-3.0 cm.

More preferably, the uniformly mixed materials are pressed into a sheet or cylinder with the diameter of 2.0-3.0cm and the height of 1.0-4.0 cm; or pressing into spherical shape with diameter of 1.5-3.0 cm.

The third aspect of the invention provides the application of the fruit tree multi-micro oxygen fertilizer in water supply soil oxygenation and/or soil deep layer slow oxygenation.

The invention has the beneficial effects that:

(1) after the multi-micro oxygen fertilizer for the fruit trees releases oxygen, fluffy floccules are formed, the fluffy floccules can be changed into a skeleton with a porous structure after being dried, and soil ventilation channels can be increased and the soil structure can be improved after the frame is left in soil. The fruit tree multi-micro oxygen fertilizer provided by the invention can be used for enriching oxygen for soil and prolonging the oxygen release time, and can be used for supplementing zinc, boron, iron and molybdenum microelements and calcium, magnesium, phosphorus and other nutrient elements for soil.

(2) The fruit tree multi-micro oxygen fertilizer can promote the respiration of root systems while increasing oxygen in soil, ensure the energy supply required by active absorption, and improve the absorption efficiency of trace elements, especially the absorption of zinc and boron. After the fruit tree multi-micro oxygen fertilizer is completely disintegrated by the amount of water, the pH value of the solution is about 8.5 and slightly alkaline, and the fruit tree multi-micro oxygen fertilizer can neutralize increasingly acidified orchard soil when applied to the soil, so that the effectiveness of molybdenum is improved. The product can supplement trace elements and supplement oxygen, and has good effect of relieving and correcting deficiency of trace elements.

(3) The fruit tree multi-micro-oxygen fertilizer has the advantages of simple preparation process, easily obtained raw materials, environmental friendliness and low cost; the product can release oxygen and supplement trace elements, and the two have the unexpected effect that 1+1 is more than 2; the multi-micro oxygen fertilizer for the fruit trees can quickly release oxygen in flooded soil with much water, can also be used for continuously releasing oxygen in normal soil with little water and in deep soil for a long time, widens the application range of the oxygen fertilizer, and realizes deep oxygen enrichment of the soil. The invention uses calcium magnesium phosphate fertilizer to stabilize the decomposition of hydrogen peroxide and uses coal powder to adsorb oxygen to stabilize the oxygen release, belonging to the technical field of solving the problem of too fast oxygen release by adopting a new and more effective scheme. The use of the coal powder also avoids the over-quick release of trace elements; the fruit tree multi-micro oxygen fertilizer is prepared without using a special adhesive, so that the cost is reduced; the fruit tree multi-micro oxygen fertilizer skillfully wets and adheres to the material when pressing by using crystal water in the hydrated trace elements, so that the use of liquid water is avoided, and the reaction of calcium peroxide and water during manufacturing is also avoided.

When the calcium peroxide is the same in parts by weight, the calcium peroxide can only continuously release oxygen for 8-12 hours when being put in sufficient water, and the fruit tree multi-micro oxygen fertilizer can continuously release oxygen for 60-72 hours when being put in sufficient water, so that the oxygen release time is obviously prolonged; the fruit tree multi-micro-oxygen fertilizer is buried in soil with nearly saturated water, so that oxygen can be continuously released for 15-20 days, and the damage of soil waterlogging to plants is effectively reduced; the fruit tree multi-micro oxygen fertilizer is buried in a soil layer with the relative water content of 75% and the depth of 50 cm, can be continuously released for 40-50 days, obviously increases the number of new roots at the deep layer of 40-60 cm, and effectively promotes the robust growth of plants.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

As described in the background art, the prior oxygen fertilizer needs to use a special adhesive, and the process is generally complex; moreover, the oxygen fertilizers can release oxygen well only by a large amount of liquid water, namely the oxygen fertilizers are mainly suitable for being applied to the surface layer or shallow layer of flooded soil; if they are applied to the deep layer of soil having a low water content, it is difficult or inefficient to release oxygen because of the low amount of liquid water. Based on the above, the invention aims to provide a novel multi-micro oxygen fertilizer for fruit trees, so as to solve the problems of complex preparation process, need of special adhesive and low oxygen release efficiency in deep soil and obtain a very good effect.

In one embodiment of the invention, the multi-micro oxygen fertilizer for the fruit trees is prepared from hydrated zinc sulfate, hydrated sodium tetraborate, hydrated ammonium molybdate, calcium magnesium phosphate fertilizer, coal powder, brown soil powder and calcium peroxide according to the following steps: 1-3 parts of hydrated zinc sulfate, 3-5 parts of hydrated sodium tetraborate, 0.1-0.5 part of hydrated ammonium molybdate, 8-10 parts of calcium magnesium phosphate, 7-10 parts of coal powder and 30-40 parts of brown soil powder are mixed together to form a uniform mixture containing the 6 materials, 40-50 parts of calcium peroxide is added into the uniform mixture, then the mixture containing the 7 materials is uniformly mixed to form a mixture containing the 7 materials, and then the mixture containing the 7 materials is pressed into a sheet or a cylinder with the diameter of 1.5-4.0cm and the height of 0.5-4.0cm or a ball with the diameter of 1.5-3.0 cm.

In the fruit tree multi-micro oxygen fertilizer, hydrated zinc sulfate, hydrated sodium tetraborate, hydrated ammonium molybdate and hydrated ferrous sulfate are specially selected, trace elements are provided, and crystal water in the fertilizer is used for wetting and bonding the materials during compression molding, so that tabletting molding is facilitated, and the use of the crystal water can avoid the use of free water for wetting the materials and prevent the reaction of water and calcium peroxide.

In the fruit tree multi-micro oxygen fertilizer, the calcium magnesium phosphate fertilizer is a commercially available product; the main components of the composite are calcium phosphate, magnesium silicate and calcium silicate, and besides providing calcium, magnesium and phosphorus nutrient elements, the magnesium silicate and phosphate radical in the composite have a stabilizing effect on hydrogen peroxide and can slow down the decomposition rate of the hydrogen peroxide.

In the fruit tree multi-micro oxygen fertilizer, the specially selected coal powder has the functions of adsorbing and slowly releasing zinc ions, and can prevent the formation of excessive free zinc ions which possibly generate toxicity; meanwhile, the coal powder can also adsorb oxygen, delay the release rate of the oxygen formed by the hydrogen peroxide and prolong the release time of the oxygen; in addition, the coal powder mainly contains organic carbon, and soil organic carbon can be increased.

The brown soil powder is selected, not only can play a role in filling and bonding, but also is a main cultivation soil for northern fruit trees, especially apples, the brown soil powder is easy to obtain materials and low in cost, and the brown soil powder and the coal powder are acidic materials. The slightly acidic brown soil and coal powder can buffer and reduce the alkalinity of a calcium peroxide product, so that the pH of a finished product is prevented from being too high; meanwhile, both the brown loam and the coal powder have water absorption capacity, and the finished product can be slowly cracked after meeting water in the soil, so that the calcium peroxide is gradually contacted with the water to slowly generate hydrogen peroxide; the hydrogen peroxide can be slowly decomposed to release oxygen under the stability of magnesium silicate and phosphate radical in the calcium magnesium phosphate fertilizer; some of the released oxygen is temporarily adsorbed by the pulverized coal, and the oxygen release time is generally prolonged. The specific coal powder particle size is not more than 90 microns, the brown soil powder particle size is not more than 250 microns, and the mixed material can be pressed and formed and the finished product can slowly absorb water and crack.

In a word, the fruit tree multi-micro oxygen fertilizer has the synergistic effect among the raw materials, so that the prepared fruit tree multi-micro oxygen fertilizer can not only enrich oxygen for soil and prolong the release time of oxygen, but also supplement trace elements such as zinc, boron, iron and molybdenum, calcium, magnesium, phosphorus and other nutrient elements for soil, improve the soil structure, relieve and correct trace element deficiency, and has unexpected technical effects in many aspects.

In a preferred embodiment of the invention, the preparation method of the fruit tree multi-micro oxygen fertilizer comprises the following steps:

grinding coal and brown loam into powders respectively; sieving the coal dust by using a mesh screen with the pore size of 90 microns and the pore size of 75 microns, and taking the coal dust between the two screens for later use; screening the brown soil powder by using a mesh screen with the pore size of 250 microns and the pore size of 180 microns, and taking the brown soil powder between the two screens for later use; weighing 8 parts of the spare coal powder and 35 parts of brown soil powder according to the mass parts, weighing 2 parts of zinc sulfate heptahydrate, 4 parts of sodium tetraborate decahydrate, 0.2 part of ammonium molybdate tetrahydrate and 9 parts of calcium magnesium phosphate fertilizer according to the mass parts, mixing the 6 weighed materials together, uniformly stirring, adding 45 parts of calcium peroxide, uniformly stirring, and finally pressing into a sheet or cylinder shape with the diameter of 2.0-3.0cm and the height of 1.0-4.0cm or a ball shape with the diameter of 1.5-3.0 cm.

In order to make the technical solutions of the present application more clearly understood by those skilled in the art, the technical solutions of the present application will be described in detail below with reference to specific embodiments.

The test materials used in the examples of the present invention were all commercially available materials that are conventional in the art and are commercially available.

Example 1:

respectively grinding coal and brown soil (brown soil collected from Taishan district of Taian city) into powder, and respectively sieving with 75 micrometer mesh sieve and 200 micrometer mesh sieve to obtain coal powder with particle size not more than 75 micrometer and brown soil powder with particle size not more than 200 micrometer; weighing 9kg of standby coal powder, 30kg of standby brown soil powder, 2kg of zinc sulfate heptahydrate, 5kg of sodium tetraborate decahydrate, 0.5kg of ammonium molybdate tetrahydrate and 9kg of calcium magnesium phosphate fertilizer, mixing the materials uniformly, then adding 40kg of calcium peroxide, mixing the materials uniformly to form a mixture containing 7 materials, and pressing the mixture into a sheet with the diameter of 2.0cm and the height of 1.0cm to obtain the multi-micro oxygen fertilizer for the fruit trees.

Example 2:

respectively grinding coal and brown soil (brown soil collected from Taishan district of Taian city) into powder, sieving coal powder with mesh sieve with pore size of 90 μm and pore size of 75 μm, and collecting coal powder with particle size of 75-90 μm between the two sieves; screening the brown soil powder by using a mesh screen with the pore size of 250 microns and the pore size of 180 microns, and taking the brown soil powder with the particle size of 180 microns and the particle size of 250 microns between the two screens for later use; weighing 8kg of the spare coal powder and 35kg of brown soil powder, simultaneously weighing 2kg of zinc sulfate heptahydrate, 4kg of sodium tetraborate decahydrate, 0.2kg of ammonium molybdate tetrahydrate and 9kg of calcium magnesium phosphate fertilizer, mixing the 6 weighed materials together, uniformly stirring, adding 45kg of calcium peroxide, uniformly stirring, and finally pressing into a cylindrical shape with the diameter of 2.5cm and the height of 4.0cm or a spherical shape with the diameter of 1.5-3.0cm to obtain the fruit tree hypermicro oxygen fertilizer.

Example 3:

respectively grinding coal and brown soil (brown soil collected from Taishan district of Taian city) into powder, sieving coal powder with mesh sieve with pore size of 90 μm and pore size of 75 μm, and collecting coal powder with particle size of 75-90 μm between the two sieves; screening the brown soil powder by using a mesh screen with the pore size of 250 microns and the pore size of 180 microns, and taking the brown soil powder with the particle size of 180 microns and the particle size of 250 microns between the two screens for later use; weighing 8kg of the spare coal powder and 35kg of brown soil powder, simultaneously weighing 2kg of zinc sulfate heptahydrate, 4kg of sodium tetraborate decahydrate, 0.2kg of ammonium molybdate tetrahydrate and 9kg of calcium magnesium phosphate fertilizer, mixing the 6 weighed materials together, uniformly stirring, adding 45kg of calcium peroxide, uniformly stirring, and finally pressing into a ball shape with the diameter of 2.0cm to obtain the multi-micro oxygen fertilizer for the fruit trees.

Example 4:

purchasing coal powder with particle size not more than 75 microns for later use, grinding brown soil (collected from Taishan district in Taian city), and sieving with a mesh sieve with particle size of 180 microns to obtain brown soil powder with particle size not more than 180 microns for later use; weighing 15kg of the standby coal powder, 80kg of the standby brown soil powder, 5kg of zinc sulfate heptahydrate, 10kg of sodium tetraborate decahydrate, 1kg of ammonium molybdate tetrahydrate and 20kg of calcium magnesium phosphate fertilizer, uniformly mixing the materials, then adding 100kg of calcium peroxide, uniformly mixing the materials to form a mixture containing 7 materials, and pressing the mixture into a sheet with the diameter of 2.0cm and the height of 1.0cm to obtain the multi-micro oxygen fertilizer for the fruit trees.

Effect test:

the fruit tree oxygen-rich micro-element fertilizers prepared in the embodiments 1-4 of the invention are respectively put in sufficient water and buried in soil with nearly saturated water content and relative water content of 75% and depth of 50 cm, and the oxygen release duration time is examined.

The result shows that the multi-micro oxygen fertilizer for the fruit trees, prepared by the invention, can continuously release oxygen for 60-72 hours when being put in sufficient water (the oxygen release time of the multi-micro oxygen fertilizer prepared in the embodiment 2 is 72 hours), and the oxygen release time is obviously prolonged; the fruit tree multi-micro-oxygen fertilizer is buried in soil with nearly saturated water, oxygen can be released continuously for 15-20 days (the oxygen release time of the multi-micro-oxygen fertilizer prepared in the embodiment 2 is 20 days), and the damage of soil waterlogging to plants is effectively reduced; the fruit tree multi-micro oxygen fertilizer is buried in a soil layer with the relative water content of 75% and the depth of 50 cm, can be continuously released for 40-50 days (the oxygen release time of the multi-micro oxygen fertilizer prepared in the embodiment 3 is 50 days), obviously increases the number of new roots in the depth of 40-60 cm, and effectively promotes the robust growth of plants.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (4)

1. The fruit tree multi-micro-oxygen fertilizer is characterized by being used for slow oxygenation of deep soil layers and prepared from the following raw materials in parts by weight:

1-3 parts of hydrated zinc sulfate, 3-5 parts of hydrated sodium tetraborate, 0.1-0.5 part of hydrated ammonium molybdate, 8-10 parts of calcium magnesium phosphate fertilizer, 7-10 parts of coal powder, 30-40 parts of brown soil powder and 40-50 parts of calcium peroxide;

the particle size of the pulverized coal is less than or equal to 90 mu m; the grain size of the brown soil powder is less than or equal to 250 mu m;

the fruit tree multi-micro-oxygen fertilizer is prepared by the following method:

mixing hydrated zinc sulfate, hydrated sodium tetraborate, hydrated ammonium molybdate, calcium magnesium phosphate fertilizer, coal powder and brown soil powder, adding calcium peroxide, and uniformly mixing; pressing the uniformly mixed materials into a sheet or cylinder with the diameter of 2.0-3.0cm and the height of 1.0-4.0 cm; or pressing into spherical shape with diameter of 1.5-3.0 cm;

the hydrated zinc sulfate is zinc sulfate heptahydrate, the hydrated sodium tetraborate is sodium tetraborate decahydrate, and the hydrated ammonium molybdate is ammonium molybdate tetrahydrate.

2. The fruit tree multi-micro oxygen fertilizer as claimed in claim 1, wherein the particle size of the pulverized coal is 75-90 μm; the particle size of the brown soil powder is 180-250 mu m.

3. The fruit tree multi-micro oxygen fertilizer as claimed in claim 1, which is prepared from the following raw materials in parts by weight:

2 parts of hydrated zinc sulfate, 4 parts of hydrated sodium tetraborate, 0.2 part of hydrated ammonium molybdate, 9 parts of calcium magnesium phosphate fertilizer, 8 parts of coal powder, 35 parts of brown soil powder and 45 parts of calcium peroxide.

4. The application of the fruit tree multi-micro oxygen fertilizer in claim 1 or 2 in oxygen enrichment of ponded soil and/or slow oxygen enrichment of deep soil.