CN104788170B - Alkalescent slow-release compound fertilizer, silicon substrate alkalescent sustained release composite microbe fertilizer and preparation method thereof - Google Patents

Abstract

The invention relates to a weak alkaline slow-release compound fertilizer, a silicon-based weak alkaline slow-release compound microbial fertilizer and a preparation method thereof. Weakly alkaline slow-release compound fertilizer, comprising 20-200 parts by weight of water-soluble silicate, 50-400 parts by weight of ammonium polyphosphate, and 200-700 parts by weight of organic carrier, the pH value of the ammonium polyphosphate is greater than or equal to 7 . Silicon-based weak alkaline slow-release compound microbial fertilizer is based on weak alkaline slow-release compound fertilizer with beneficial bacteria masterbatch. The present invention selects ammonium polyphosphate, which not only contains relatively high content of N and P, but also possesses outstanding long-acting slow-release and chelating properties due to its unique degree of polymerization and super-strong function of complexing metal cations. The ability of medium and trace elements in the soil, the release rate of phosphorus and ammonium is slow, so the effect is long-lasting; (silicon can print heavy metals and be absorbed by plants; PH value is 7-8.5, which is beneficial to soil improvement.

Description

Weak alkaline slow-release compound fertilizer, silicon-based weak alkaline slow-release compound microbial fertilizer and preparation thereof method

technical field

The invention belongs to the field of chemical fertilizers, and in particular relates to a weak alkaline slow-release compound fertilizer, a silicon-based weak alkaline slow-release compound microbial fertilizer and their preparation methods.

Background technique

Silicon is an important nutrient element for plants, and most plants contain silicon. Tests show that when 1,000 kg of rice is produced, the amount of silicon dioxide absorbed by the aboveground part of the rice reaches 150 kg, exceeding the sum of nitrogen, phosphorus, and potassium absorbed by the rice. From the ashes of rice, wheat, barley, soybeans, lentils, and fennel, the oxides of nutrients silicon, phosphorus, potassium, calcium, magnesium, iron, and manganese account for about 80% of the ash, of which silicon oxides account for 14.2%. -61.4%. The application of silicon fertilizer is beneficial to improve the photosynthesis of crops. After applying silicon fertilizer to crops, it can make the epidermis cells of crops silicified, make the stems and leaves of crops straight, reduce shading, and make leaves photosynthetic. For example, after applying silicon to rice, the leaf angle shrunk by 25.4 degrees, and the photosynthesis of the canopy increased by more than 10%. Silicon fertilizer can enhance the resistance of crops to diseases and insect pests and reduce the damage of diseases and insect pests. After the crops absorb silicon, they will form silicified cells in the body, thicken the cell walls on the surface of stems and leaves, and increase the cuticle, thereby improving the ability of insect resistance and disease resistance, especially for rice. Plague, leaf spot, stem rot, sclerotinia, bacterial blight and stem borer, wheat powdery mildew, rust, wheat fly, cotton bollworm, etc. Silicon fertilizer can improve the lodging resistance of crops. Because the stalks of crops are straight, the lodging resistance ability is increased by about 80%. Silicon fertilizer can enhance the air permeability of crops, increase the silicon content in crops, strengthen the rigidity of crop ducts, and promote air permeability, which is of great significance to silicon-loving crops such as rice and apples. It can not only promote the growth of crop roots, but also prevent root rot and premature aging, especially for the prevention and treatment of rice root rot. Improve the stress resistance of crops. After applying silicon fertilizer, the silicified cells produced can effectively regulate the opening and closing of leaf stomata, excavate water transpiration, and improve the ability of crops to resist drought, dry hot wind and low temperature. Silicon can reduce the fixation of phosphorus in the soil, activate phosphorus in the soil, and promote the operation of phosphorus in crops, thereby increasing the seed setting rate. Silicon fertilizer is a health-care fertilizer that can improve soil, correct soil acidity, increase soil base, promote organic fertilizer decomposition, and inhibit soil bacteria. Silicon is a quality element, which can improve the quality of agricultural products and is beneficial to storage and transportation.

Soil acidification is one of the main problems restricting the sustainable development of agriculture in China. The problem of soil acidification in China is very serious. The area of various acidified soils is about 200 million hm ² . In recent years, with the development of industry, the continuous increase of acid rain, the extensive use of chemical fertilizers, the continuous harvesting of crops to remove alkaline substances in the soil, etc., have further aggravated soil acidification. Soil acidification will lead to a large amount of leaching of nutrients such as Ca, Mg, and P in the soil; and the activity of heavy metals in the soil will greatly increase. The poisoning of heavy metals in acidic soil is the main factor that inhibits crop growth and leads to crop yield reduction.

The problem of heavy metal pollution in my country's soil has become increasingly serious, posing a great threat to people's health. The heavy metals accumulated in crops enter the human body through the food chain, which will bring potential harm to human health. Therefore, also be badly in need of a kind of fertilizer that can not make soil acidification, to be applied to agricultural production.

Contents of the invention

In order to solve the technical problems of low effective silicon content and low silicon absorption and utilization rate in existing fertilizers, the present invention provides a weakly alkaline slow-release compound fertilizer, a silicon-based weakly alkaline slow-release compound microbial fertilizer and provides the two Fertilizer preparation method.

Technical solution of the present invention is:

The weak alkaline slow-release compound fertilizer is special in that it includes 20-200 parts by weight of water-soluble silicate, 50-400 parts by weight of ammonium polyphosphate, 200-700 parts by weight of organic carrier, and the ammonium polyphosphate The PH value is greater than or equal to 7.

Ammonium polyphosphate is a metal cation coupling agent that increases the absorption rate of metal cations by crops. It is weakly alkaline and has a slow-release function with a certain degree of polymerization. It can supplement phosphorus and nitrogen, two elements needed by plants.

The silicon content in water-soluble silicate is relatively high, and the absorption and utilization rate of silicon is high. It combines with various heavy metals to produce flocculation, inhibits the absorption of heavy metals by crops in an acidic environment, and avoids entering the plant food chain. After forming monosilicic acid It also has super permeability, which makes it easier for crops to absorb nutrients; the effect is rapid; the silicon in the silicate can increase the production and income of silicon-loving crops such as rice, and enhance the hardness and brightness of the crop epidermis.

The addition of organic matter carrier not only provides a large amount of organic matter for the land, which is beneficial to the growth of crops, but also avoids the chemical reaction of potassium silicate and ammonium polyphosphate alone, which affects the polymerization function of ammonium polyphosphate.

The above-mentioned weak alkaline slow-release compound fertilizer also includes 200-400 parts by weight of a compound containing more than 30% of the N element by mass fraction, and the compound containing more than 30% of the N element by mass fraction is urea or other nitrogen-containing compounds.

The organic matter carrier in the weak alkaline slow-release compound fertilizer is at least one of nitrated ammonium humate, fermented smoke, rice husk powder, humic acid or mushroom dregs. Humic acid itself is weakly alkaline. After nitrification, the activity of humic acid is increased, N element is increased, and it combines with N element in the compound with a mass fraction of N element above 30% to form weakly alkaline nitrifying humic acid. Ammonium acid, reducing the degree of chemical reaction between potassium silicate and ammonium polyphosphate. Fermented smoke contains nicotine, which has the effect of repelling insects, can supplement organic matter, loosen the soil, is safe and does not contain heavy metals, and has a wide range of sources. It can effectively use tobacco factory waste. The natural carbonization speed is much faster than organic matter such as straw, and it can be converted into organic matter. The cycle is short, and the action time of organic matter is long. It contains 8 NPKs, and the NPK content is relatively rich.

The degree of polymerization of the ammonium polyphosphate in the weak alkaline slow-release compound fertilizer is at least one of 1-50.

The degree of polymerization of the ammonium polyphosphate in the above-mentioned weak alkaline slow-release compound fertilizer is n1 and n2, n1 is not equal to n2, 1≤degree of polymerization n1≤20, n1 has good water solubility, 20≤degree of polymerization n2≤50, n2 is water soluble The performance is slightly worse, but it can enhance the slow-release function of fertilizers.

The mass ratio of n1 and n2 in the weak alkaline slow-release compound fertilizer is 4:(0.5-1). The combined use of ammonium polyphosphate with two degrees of polymerization can meet the requirement of water solubility on the one hand, and ensure the slow-release effect of weakly alkaline slow-release compound fertilizer on the other hand.

In the above-mentioned weak alkaline slow-release compound fertilizer, the water-soluble silicate includes at least one of potassium silicate, sodium silicate, and potassium-sodium silicate, preferably potassium silicate, which can supplement the silicon element and Potassium. The form of potassium silicate is preferably powder instant potassium silicate. Its production process is simple, its dissolution speed is fast, and ionic silicon can be effectively absorbed by crops, improve crop quality, aggregate heavy metals in the soil, and prevent heavy metals from being released into crops in an acidified environment. Transport in the body to avoid entering the food chain; the production process of solid potassium silicate is relatively complicated and the dissolution rate is slow.

The weak alkaline slow-release compound fertilizer also includes at least one of the following auxiliary materials, 10-50 parts by weight of magnesium sulfate, 5-15 parts by weight of zinc nitrate, 5-15 parts by weight of sodium octaborate tetrahydrate, 1-2 parts by weight of ammonium paramolybdate 10 parts by weight. Magnesium sulfate and zinc nitrate supplement magnesium and zinc elements; sodium octaborate tetrahydrate is alkaline, boron is an element required for crops to bloom and bear fruit, and leguminous crops are very sensitive to molybdenum, which can increase production.

A silicon-based weakly alkaline slow-release compound microbial fertilizer is characterized in that: in addition to the above formula in the above-mentioned weakly alkaline slow-release compound fertilizer, it also includes 30-50 parts by weight of beneficial bacteria masterbatch, beneficial bacteria masterbatch The number of beneficial bacteria in it is 10-20 billion/g. The beneficial bacteria masterbatch survives in an alkaline environment, decomposes phosphorus and potassium, secretes antibiotics, indole acetic acid, and cytokinins, and promotes plant growth.

In the silicon-based weakly alkaline slow-release compound microbial fertilizer, 20-60 parts by weight of starch is added to ensure the activity of beneficial bacteria.

A preparation method of weakly alkaline slow-release compound fertilizer, which is special in that it comprises the following steps:

1) Dissolving water-soluble silicate in water to form silicate aqueous solution, dissolving ammonium polyphosphate in another part of water to form ammonium polyphosphate aqueous solution;

2] Add the two aqueous solutions to the organic carrier respectively, and mix well.

For the convenience of use, it is granulated and the water content is controlled to 15-25%.

The step 1] of the preparation method of the above-mentioned weak alkaline slow-release compound fertilizer also includes adding the compound containing more than 30% of the mass fraction of N element to the silicate aqueous solution and/or the ammonium polyphosphate aqueous solution to dissolve;

The preparation method of the above-mentioned weak alkaline slow-release compound fertilizer, when the raw materials also contain auxiliary materials, also includes step 3]: add auxiliary materials to the organic carrier, and mix evenly.

A method for preparing a silicon-based weakly alkaline slow-release compound microbial fertilizer, which is special in that it includes the following steps: on the basis of the preparation method of the weakly alkaline slow-release compound fertilizer, that is, after step 2], there is For auxiliary materials, after step 3], spray the beneficial bacteria masterbatch evenly into the organic carrier. If there is starch, add starch, stir evenly, granulate, and control the water content by 15-25%.

The target test crops of the present invention: rice, apples, vegetables and other silicon-loving crops.

The advantages of the present invention are:

(1) The weak alkaline slow-release compound fertilizer of the present invention and the silicon-based weak alkaline slow-release compound microbial fertilizer are added with water-soluble silicate, silicon can increase production and income of silicon-loving crops such as rice, and enhance the hardness and brightness of the crop epidermis. The combination of various heavy metals produces flocculation, which inhibits the absorption of heavy metals by crops in acidic environments and avoids entering the plant food chain. After forming monosilicic acid, it has super permeability, making it easier for crops to absorb nutrients; it works quickly; water-soluble silicon The effective silicon content in the acid salt is relatively high, and the solubility is good, so that the absorption and utilization rate of silicon is high;

(2) ammonium polyphosphate is selected for the weak alkaline slow-release compound fertilizer of the present invention and the silicon-based weak alkaline slow-release compound microbial fertilizer, which not only contains higher content of N and P, but also has the unique degree of polymerization and the specific polymerization degree of ammonium polyphosphate. The super strong function of complexing metal cations makes it have outstanding long-term slow-release ability and the ability to chelate medium and trace elements in soil. The release speed of phosphorus and ammonium is slow, so the effect is long-lasting;

(3) The silicon-based weakly alkaline slow-release compound microbial fertilizer of the present invention combines fertilizer and bacteria, beneficial bacteria secrete indole acetic acid, antibiotics and other substances, takes root and strengthens, and fights viruses; silicon elements can print heavy metals and be absorbed by plants;

(4) The weakly alkaline slow-release compound fertilizer and the silicon-based weakly alkaline slow-release compound microbial fertilizer of the present invention are weakly alkaline and have a pH value of 7-8.5, which is beneficial to soil improvement.

(5) In the silicon-based weak alkaline slow-release compound microbial fertilizer of the present invention, the combination of fermented smoke foam and edible starch not only ensures good supplementation of organic matter, but also particularly strengthens the rapid reproduction and activity of beneficial bacteria.

detailed description

Produce fertilizer according to the formula in the table:

Note: The degree of polymerization of ammonium polyphosphate is 20 and 50, and the weight ratio is 4:0.5.

Examples 1.1, 2.1, 3.1, 4.1, and 5.1 prepared weakly alkaline slow-release compound fertilizers, and their preparation methods:

1) Dissolve powdered instant potassium silicate in water to form an aqueous solution of potassium silicate at a temperature of 30°C, and dissolve ammonium polyphosphate in another portion of water to form an aqueous solution of ammonium polyphosphate;

2) Add two parts of the aqueous solution to the organic carrier (nitrated ammonium humate, or a mixture of fermented smoke and nitrated ammonium humate), and mix well;

3] Send it to a granulator for granulation, and control the water content to 25%.

The prepared weak alkaline slow-release compound fertilizer contains nitrogen, phosphorus, potassium, silicon and organic matter, and has a pH value of 8.

Examples 1.2, 2.2, and 3.2 prepared weakly alkaline slow-release compound fertilizers, and their preparation methods:

1] Dissolve powdered instant potassium silicate in water to form an aqueous solution of potassium silicate at a temperature of 30°C, and dissolve ammonium polyphosphate in another part of water to form an aqueous solution of ammonium polyphosphate; add urea to the aqueous silicate solution and / or ammonium polyphosphate aqueous solution is dissolved;

2) Add two parts of the aqueous solution to the organic carrier (nitrated ammonium humate, or a mixture of fermented smoke and nitrated ammonium humate), and mix well;

3) Send it to a granulator for granulation, and control the water content to 15%.

The prepared weak alkaline slow-release compound fertilizer contains nitrogen, phosphorus, potassium, silicon and organic matter, and has a pH value of 7.5.

Examples 2.3, 4.2, and 5.2 prepared weakly alkaline slow-release compound fertilizers, and their preparation methods:

1] Dissolve powdered instant potassium silicate in water to form an aqueous solution of potassium silicate at a temperature of 30°C, and dissolve ammonium polyphosphate in another part of water to form an aqueous solution of ammonium polyphosphate; add urea to the aqueous silicate solution and / or ammonium polyphosphate aqueous solution is dissolved;

2) Add the two aqueous solutions to the organic carrier (nitrated ammonium humate, or fermented smoke, or a mixture of fermented smoke and nitrified ammonium humate), and mix well;

3) Add auxiliary materials (magnesium sulfate, zinc nitrate, sodium octaborate tetrahydrate, ammonium paramolybdate) to the organic carrier, and mix well;

4] Send it to the granulator for granulation, and control the water content to 20%.

The prepared weak alkaline slow-release compound fertilizer contains nitrogen, phosphorus, potassium, silicon, magnesium, zinc, boron, molybdenum and organic matter, and has a pH value of 7.5.

Example 1.3, 2.4, 3.3, 4.3, 5.3 prepared silicon-based weakly alkaline slow-release compound microbial fertilizer, and its preparation method is:

1] Dissolve powdered instant potassium silicate in water to form an aqueous solution of potassium silicate at a temperature of 30°C, and dissolve ammonium polyphosphate in another part of water to form an aqueous solution of ammonium polyphosphate; add urea to the aqueous silicate solution and / or ammonium polyphosphate aqueous solution is dissolved;

2.1] For each ton of humic acid, add 50-100 kg of dilute nitric acid with a solute mass fraction of 20%, mix well and send it to the nitrification tank for nitrification reaction to generate nitrified humic acid ammonium for later use;

2.2] Add water to the smoke foam, the weight of the water is 20% to 30% of the smoke foam weight, mix well with the mother liquor of complex bacteria such as Bacillus subtilis, Bacillus licheniformis, Aspergillus niger, etc., and ferment for 10-30 days, and set aside;

2.3] Add two parts of aqueous solution to the mixture of step 2.1] and step 2.2] respectively, and mix well;

3) Add auxiliary materials (magnesium sulfate, zinc nitrate, sodium octaborate tetrahydrate, ammonium paramolybdate) to the material obtained in step 2.3], and mix well;

4) Spray the beneficial bacteria masterbatch evenly on the material obtained in step 3], then add starch, stir evenly, and granulate. The granulation temperature is controlled at 80-120 degrees Celsius, the water content is controlled at 15-25%, and the temperature of the finished material outlet is controlled. At 60 degrees Celsius, cool and dry, measure and pack. The beneficial bacteria masterbatch is at least one of Bacillus subtilis, Bacillus jelly-like, Bacillus megaterium, Bacillus lateral sporosum, and Bacillus licheniformis.

The prepared weak alkaline slow-release compound fertilizer contains nitrogen, phosphorus, potassium, silicon, magnesium, zinc, boron, molybdenum, rich beneficial bacteria and organic matter, and has a pH value of 8.

Example 5.3 Effect experiment of silicon-based weak alkaline slow-release compound microbial fertilizer

1. The effect of silicon-based weak alkaline slow-release compound microbial fertilizer on improving the pH value of acidic soil

Test object: Apple field in Guanshui Town, Muping District, Yantai City, Shandong Province; the initial pH value of the soil is 3.2-5.

Test method: the silicon-based weak-alkaline slow-release compound microbial fertilizer prepared by Example 5.3 is used in the apple field, and the application rate is 0 (do not use the silicon-based weak-alkaline slow-release compound microbial fertilizer of the present invention, continue to use the common compound fertilizer as usual) Fertilizer, as a blank control), 50Kg/hm ² , 100Kg/hm ² , 0-60cm soil was taken for pH measurement after application, and the results are shown in Table 1.

Table 1 Soil pH value detection

It can be seen from Table 1 that with the increase in the application rate of silicon-based weak alkaline slow-release compound microbial fertilizer, the soil pH value is on the rise; and the improvement effect of the surface soil is better, and the soil pH value of the deep soil (60cm) is also achieved. improvement and optimization.

2. The effect of silicon-based weak alkaline slow-release compound microbial fertilizer on soil nutrients

The test field is the same as above, using conventional fertilization (CK) as a control, on the basis of conventional fertilization, add 100Kg/hm of the silicon ^- based weak alkaline slow-release compound microbial fertilizer prepared in Example 5.3 for soil conditioning.

After the test, the plow layer soil (0-20cm) of each treatment plot was taken to measure the content of total nitrogen, available phosphorus, available potassium, available silicon, available boron, available zinc, exchangeable calcium and exchangeable magnesium in the soil. The soil nutrient test results are shown in Table 2 below:

Table 2 The effective element nutrient content in the soil

As can be seen from Table 2, on the basis of conventional fertilization, the silicon-based weakly alkaline slow-release compound microbial fertilizer of the present invention is applied, and in the soil, total nitrogen, available phosphorus, available potassium, available silicon, available boron, available zinc, exchangeable calcium, The content of exchangeable magnesium was significantly increased.

3. Yield-increasing effect of silicon-based weak alkaline slow-release compound microbial fertilizer on soil conditioning

3.1 Test field: Apple field in Guanshui Town, Muping District, Yantai City, Shandong Province; the initial pH value of the soil is 3.2-4.5.

In the case of the same use of organic fertilizer base fertilizer, the annual amount of ordinary nitrogen, phosphorus and potassium compound fertilizer used in the control field was 250 kg per mu, while in the test field, the annual amount of ordinary nitrogen, phosphorus and potassium compound fertilizer was reduced to 100 kg, and additionally applied The application rate of the silicon-based weak alkaline slow-release compound microbial fertilizer prepared in Example 5.3 of the invention was 200Kg/hm ² . After harvesting in November, the yield per mu of apples was measured: The yield per mu of apples in the farmland was 7750Kg/hm ² , and the yield per mu of apples in the control field was 5790Kg/hm ² . Fruit shrinkage disease did not occur that year, and the color and sugar content of the fruit were two percentage points higher than those of the control field, and the commodity value was significantly increased. At the same time, it can be clearly seen that the use of this product can significantly reduce the use of compound fertilizers by 60%, effectively reducing Residual pollution of land caused by excessive use of common compound fertilizers. Especially in the late growth period of the fruit trees, the vital signs of the fruit trees in the experimental field were significantly better than those in the control field. The leaves and underground root systems of the two groups were compared twice on October 15 and November 25. The leaf function of the fruit trees in the experimental field was degraded. The degree (such as yellowing of leaves, amount of fallen leaves) is obviously not as much as that in the control field, and the hairy roots of the underground root system are obviously in a vigorous growth state, which is more and longer than that of the fruit tree root system in the control field. It fully shows that there is no defertilization phenomenon in the later stage of the fruit trees in the test field, and it also reflects the slow release of nutrients of this product.

3.2 Experimental field: a paddy field in the outskirts of an industrial city in Hunan Province. The basic chemical properties of the soil are: organic matter 17.79g/kg, cation exchange capacity 3.07cmol/kg, initial pH value 3.4-4.2, which is severely acidic soil.

Using 100Kg/hm ² of acid-soil-improved silicon-based weak-alkaline slow-release compound microbial fertilizer prepared in Example 5.3, the same amount of compound fertilizer and urea topdressing as in the previous year was used in the experimental plot. Measure the single-season yield of rice compared with 561 kilograms and 579 kilograms of single-season yield per mu in the previous year without using the silicon-based weak alkaline slow-release compound microbial fertilizer of the present invention. The thousand-grain weights were 30.1g and 30.7g respectively, and the thousand-grain weights in the control fields were 25.7g and 25.8g respectively. During the rice planting process, there was less lodging, and the occurrence of physiological diseases such as rice blast and flax spot was also significantly reduced compared with the previous ones. Physiological diseases basically did not occur. At the same time, the rice stalks of the two rice test fields were degreened later than the control field, and the rice maturity test field was 5-7 days later than the control field, which shows that the slow release of nutrients of this product has played a great role in improving the yield of rice. This is also a good embodiment of the superiority of the nutrient slow release function of the experimental product.

Claims (8)

1. alkalescent slow-release compound fertilizer, it is characterised in that：Including water miscible silicate 20-200 parts by weight, APP 50- 400 parts by weight, organic matter carrier 200-700 parts by weight, the p H values of the APP are more than or equal to 7；The APP The degree of polymerization is that n1 and n2, n1 are not equal to n2,1≤polymerization degree n 1≤20,20≤polymerization degree n 2≤50.

2. alkalescent slow-release compound fertilizer according to claim 1, it is characterised in that：The alkalescent slow-release compound fertilizer is also wrapped Include compound 200-400 parts by weight of the mass fraction containing N element more than 30%, the mass fraction containing N element 30% with On compound be urea.

3. alkalescent slow-release compound fertilizer according to claim 1 or 2, it is characterised in that：The organic matter carrier is nitrification Ammonium humate, fermentation cigarette foam or powdered rice hulls or at least one of humic acid or mushroom residue.

4. alkalescent slow-release compound fertilizer according to claim 1 or 2, it is characterised in that：N1 and n2 mass ratio is 4: (0.5-1)。

5. alkalescent slow-release compound fertilizer according to claim 1 or 2, it is characterised in that：The water miscible silicate bag Include at least one of potassium silicate, sodium metasilicate, sodium potassium silicate；If necessary, in addition to following at least one auxiliary material, magnesium sulfate 10- 50 parts by weight, zinc nitrate 5-15 parts by weight, the Boratex 5-15 parts by weight of four water eight, ammonium paramolybdate 1-10 parts by weight.

6. alkalescent slow-release compound fertilizer according to claim 1 or 2, it is characterised in that：Also include beneficial bacterium masterbatch 30-50 Beneficial bacterium quantity hundred million/g of 100-200 in parts by weight, beneficial bacterium masterbatch, if necessary, in addition to starch 20-60 parts by weight.

7. the preparation method based on any described alkalescent slow-release compound fertilizer of claim 1 to 6, it is characterised in that：Including with Lower step：

1】Water miscible silicate is dissolved in the water to form aqueous silicate solution, APP is dissolved in another water, Form the APP aqueous solution；

2】Two parts of aqueous solution are added separately in organic matter carrier, are well mixed；

If necessary, step 1】Also include, it is water-soluble that compound of the mass fraction containing N element more than 30% is added into silicate Liquid and/or APP aqueous dissolution；

When also containing auxiliary material in raw material, in addition to step 3】, auxiliary material is added into organic matter carrier, is well mixed.

8. the preparation method of alkalescent slow-release compound fertilizer according to claim 7, it is characterised in that：Comprise the following steps：

In step 2】Afterwards, in step 3 when having an auxiliary material】Afterwards, the uniform sprinkling beneficial bacterium masterbatch into organic matter carrier, there is starch When, then starch is added, and stir, granulate, control moisture 15-25%.