Acid soil particle conditioner as well as preparation method and application thereof

Abstract

The invention discloses an acid soil particle conditioner as well as a preparation method and application thereof. The acidic soil particle conditioner is prepared from the following raw materials in parts by weight: 5 to 20 parts of slaked lime powder, 5 to 20 parts of calcium magnesium phosphate fertilizer, 50 to 68 parts of earthworm manure, 1 to 30 parts of filler, 0.5 to 3 parts of binder and 45 to 50 parts of water, the particle diameter of the acidic soil particle conditioner is 1-4 mm, and the water content of the acidic soil particle conditioner is 10-12%. The acidic soil particle conditioner provided by the invention is helpful for improving the transportation, storage and use convenience of the conditioner, can slowly release nutrients, and improves the utilization efficiency of the conditioner. The conditioner can effectively improve soil acidification and improve soil fertility, so that the crop yield is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of soil improvement, and particularly relates to an acidic soil granule conditioner, a preparation method thereof, and an application thereof. Background Art

[0002] With the intensification of human activities, soil acidification has occurred, seriously affecting the ecological environment. Therefore, the treatment of soil acidification is urgent. Granule conditioners are widely welcomed in the market due to their good performance and fertilization advantages. They are not only easy to fertilize, have good fluidity, do not generate dust during loading and unloading, do not caking during long-term storage, but also can achieve mechanized fertilization and improve the fertilizer utilization efficiency by slow-release nutrients.

[0003] However, the granulation success rate and granule quality of the conditioner directly affect the production efficiency and quality. Improving the granulation success rate is the key to optimizing the production line. Disk granulation has become a commonly used granulation method because of its low investment, high output, low energy consumption, and simple process, which can bring good economic benefits.

[0004] In the preparation process of the granule conditioner, the use of additives can increase the nutrient content and improve the fertilizer efficiency. In order to convert the powder into granules, the addition of a binder is essential. The binder not only helps the bonding of granules, increases the particle size, and improves the granule strength, but also plays a decisive role in the granulation process. Common binders include organic materials (such as polyvinyl alcohol, starch, calcium lignosulfonate, sodium carboxymethyl cellulose).

[0005] Through investigation, most of the soil conditioners are powders, and powders are not suitable in the actual application process. On the one hand, they can only be applied to the surface layer and cannot act on the rhizosphere environment of the soil, which limits the comprehensiveness and effectiveness of improving the soil structure. On the other hand, the powder soil conditioner is more difficult in the storage and transportation process, and farmers are not willing to use it, increasing the operation cost and hindering its promotion and application on large-scale farmland. Therefore, granulation may be the key link to achieve large-scale promotion. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide an acidic soil granule conditioner, a preparation method thereof, and an application thereof. The acidic soil granule conditioner provided by the present invention has a high granulation speed and a high balling rate. The method of the present invention can increase the granule strength of the conditioner, which is helpful to improve the transportation, storage, and use convenience of the conditioner, and can slowly release nutrients to improve the utilization efficiency of the conditioner. The conditioner can effectively improve soil acidification, enhance soil fertility, and thus increase crop yield.

[0007] To achieve the above purpose, the technical solutions designed by the present invention are as follows:

[0008] The present invention provides an acidic soil granule conditioner. By weight, the raw materials of the acidic soil granule conditioner include 5-20 parts of slaked lime powder, 5-20 parts of calcium magnesium phosphate fertilizer, 50-68 parts of earthworm manure, 1-30 parts of filler, 0.5-3 parts of binder, and 45-50 parts of water.

[0009] Further, the granule diameter of the acidic soil granule conditioner is 1-4 mm, and the water content of the acidic soil granule conditioner is 5-20%.

[0010] Still further, by weight percentage, the raw materials of the acidic soil granule conditioner include 11-13 parts of slaked lime powder, 11-13 parts of calcium magnesium phosphate fertilizer, 59-64 parts of earthworm manure, 9.5-19.5 parts of filler, 0.5 part of binder, and 50 parts of water.

[0011] Still further, the filler is any one of attapulgite, diatomite, and bentonite; the binder is any one of polyvinyl alcohol, polyacrylamide, calcium lignosulfonate, and sodium carboxymethyl cellulose.

[0012] Still further, by weight, the raw materials of the acidic soil granule conditioner include 11 parts of slaked lime powder, 11 parts of calcium magnesium phosphate fertilizer, 59 parts of earthworm manure, 19.5 parts of attapulgite, 0.5 part of sodium carboxymethyl cellulose, and 50 parts of water.

[0013] Still further, by weight, the raw materials of the acidic soil granule conditioner include 12 parts of slaked lime powder, 12 parts of calcium magnesium phosphate fertilizer, 61 parts of earthworm manure, 14.5 parts of diatomite, 0.5 part of sodium carboxymethyl cellulose, and 50 parts of water.

[0014] The present invention also provides a preparation method of the acidic soil granule conditioner, including the following steps:

[0015] (1) Weigh slaked lime powder, calcium magnesium phosphate fertilizer, earthworm manure, filler, binder, and water according to the above weight;

[0016] (2) Mix the weighed slaked lime powder, calcium magnesium phosphate fertilizer, earthworm manure, and filler, dry and then cool, and sieve to obtain the raw materials of the acidic soil conditioner;

[0017] (3) Mix the weighed binder and water to prepare a binder solution with a mass concentration of 1-2%;

[0018] (4) Place the raw materials of the acidic soil conditioner on the disc of a disc granulator, start granulation, and spray the binder solution during the process to obtain granular finished products, and dry until the water content of the granular finished products is 5-20%, then the acidic soil granule conditioner can be obtained.

[0019] Further, in the step (2), the drying temperature is 60 - 65°C, and the drying time is 20 - 24 h; the sieving is through a 20 - mesh nylon sieve;

[0020] In the step (3), the mass concentration of the binder solution is 1%;

[0021] In the step (4), the angle of the disk granulator is adjusted to 40 - 60°, the rotation speed is 30 - 50 r / min, and the drying conditions are 30 - 120°C and 0.5 - 24 h.

[0022] The present invention also provides an application of the described acidic soil particle conditioner in improving the buffering performance of soil, which is characterized in that: adding the acidic soil particle conditioner to the soil according to a mass ratio of 1:2000 - 2200 can improve the buffering performance of the soil;

[0023] The soil is acidic soil with a pH value of 4.5 - 5.5.

[0024] The present invention also provides an application of the described acidic soil particle conditioner in increasing the yield of corn.

[0025] The principle of the present invention:

[0026] After being mixed and granulated with slaked lime, calcium magnesium phosphate fertilizer, earthworm manure and filler and applied to the soil, each component forms a multiple synergistic mechanism through chemical, biological and physical synergistic effects. Slaked lime quickly neutralizes soil acidity and supplements calcium elements. Calcium magnesium phosphate fertilizer releases phosphorus and magnesium in the optimized weakly alkaline environment. Organic acids (such as humic acid) in earthworm manure chelate calcium ions, inhibit calcium phosphate precipitation, break the limitation of phosphorus fixation by high pH, and at the same time, the rich probiotics decompose organic matter and activate insoluble phosphorus. Combined with the slow-release regulation of the filler, continuous nutrient supply is achieved. Calcium and magnesium elements and organic matter synergistically enhance plant physiological functions. The complexation of humic acid slows down ion loss and protects the effectiveness of trace elements. The soil colloid aggregation promoted by slaked lime and the bonding effect of earthworm manure jointly build a stable aggregate structure, improving the water and fertilizer retention capacity. The filler balances the microbial activity and the nutrient release rhythm by adjusting the porosity, reducing the risk of excessive alkalization of slaked lime. In addition, the antagonistic bacteria in earthworm manure and the alkaline environment of slaked lime jointly inhibit soil-borne diseases, and the humic acid buffer system maintains the dynamic balance of soil pH, making up for the defects of single materials. Through the multi-dimensional synergy of pH regulation - organic activation - microbial drive - structure improvement, this formula presents a "1 + 1 + 1 > 3" composite benefit in aspects such as improving the utilization rate of phosphorus, calcium and magnesium, enhancing stress resistance, and improving soil ecology, with both rapid improvement and long-term maintenance functions, reducing the environmental load and meeting the needs of sustainable agriculture.

[0027] The beneficial effects of the present invention:

[0028] 1. The acidic soil granule conditioner of the present invention is prepared by mixing slaked lime, calcium magnesium phosphate fertilizer, and earthworm manure with fillers as raw materials. The raw materials are widely available and the resources are easily available. The acidic soil granule conditioner has both short-term and long-term effects. On the one hand, slaked lime can quickly neutralize acidity, calcium magnesium phosphate fertilizer supplements nutrients, earthworm manure enhances soil buffering capacity, and attapulgite improves soil structure, which rapidly improves soil acidity as a whole and provides rich nutrients for crops; on the other hand, earthworm manure and attapulgite help maintain the long-term stability of the soil through their slow-release properties and improved soil structure, avoid excessive acidification, promote the healthy development of soil microbial communities, and enhance the sustained fertility of the soil. The mechanism of action of the acidic soil granule conditioner enables it to not only solve the problem of soil acidity, but also provide rich nutrients to support the healthy growth of crops.

[0029] 2. The granulating fillers of the present invention are attapulgite, diatomaceous earth and bentonite. After use, they can not only significantly increase the viscosity of the soil conditioner, improve the granulation speed of the soil conditioner, improve the ball formation rate, and increase the particle strength, which is beneficial to the transportation, storage and use of the soil conditioner, but also can improve acidic soil, provide a more suitable pH environment for crop growth, and increase crop yield.

[0030] 3. The acidic soil granular conditioner prepared by the present invention is easy to distribute evenly, reduces dust and waste when applied, has a slow-release effect, improves the utilization efficiency of the conditioner, and can provide long-term soil improvement. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with specific embodiments so that those skilled in the art can understand.

[0032] Example 1

[0033] A kind of acidic soil granule conditioner

[0034] By weight, the raw materials of the acidic soil granule conditioner of this embodiment include 13 parts of slaked lime powder, 13 parts of calcium magnesium phosphate fertilizer, 64 parts of earthworm manure fertilizer, 9.5 parts of attapulgite, 0.5 parts of sodium carboxymethyl cellulose and 50 parts of water; the preparation method thereof specifically includes the following steps:

[0035] 1. According to the above weight proportions, weigh slaked lime powder, calcium magnesium phosphate fertilizer, earthworm manure fertilizer, attapulgite, sodium carboxymethyl cellulose and water.

[0036] 2. Fully mix the weighed slaked lime powder, calcium magnesium phosphate fertilizer, earthworm manure and attapulgite, dry at 60°C for 24 hours, and grind through a 20-mesh nylon sieve after natural cooling to obtain the raw material of the acidic soil conditioner.

[0037] 3. Weigh the sodium carboxymethyl cellulose and mix it with water to prepare a binder solution with a mass concentration of 1%, transfer it to a sprayer for standby, and adjust the water spray size of the sprayer.

[0038] 4. Place the raw materials of the acidic soil conditioner in the disk of a disk granulator and start the granulator. Adjust the angle of the granulator to 55° and the rotation speed to 45 r / min, so that the raw materials rotate with the disk. Use a brush to continuously clean the raw materials adhered to the disk wall and gather them in one place. At the same time, spray a small amount of binder solution into the disk, and continuously spray the binder or add raw materials according to the micro-nucleus situation to promote the continuous growth of micro-nuclei. After the particles grow to an appropriate size, take them out, screen out the particles with a diameter in the range of 1 - 4 mm, crush the larger particles, and put them back into the disk together with the small particles. Repeat the above steps until all the raw materials are granulated. Place the finished product in a constant temperature drying oven and dry it at 30°C for 2 hours, controlling the moisture content at 12%. Obtain the acidic soil particle conditioner.

[0039] Example 2

[0040] An acidic soil particle conditioner

[0041] By weight, the raw materials of the acidic soil particle conditioner in this example include 12 parts of slaked lime powder, 12 parts of calcium magnesium phosphate fertilizer, 61 parts of earthworm manure, 14.5 parts of attapulgite clay, 0.5 part of sodium carboxymethyl cellulose, and 50 parts of water; its preparation method specifically includes the following steps:

[0042] (1) Weigh the slaked lime powder, calcium magnesium phosphate fertilizer, earthworm manure, attapulgite clay, sodium carboxymethyl cellulose, and water according to the above weight parts.

[0043] (2) Thoroughly mix the weighed slaked lime powder, calcium magnesium phosphate fertilizer, earthworm manure, and attapulgite clay, dry them at 60°C for 24 hours, naturally cool them, and grind them through a 20-mesh nylon sieve to obtain the raw materials of the acidic soil conditioner.

[0044] (3) Mix the weighed sodium carboxymethyl cellulose and water to prepare a binder solution with a mass concentration of 1%, transfer it to a sprayer for standby, and adjust the water spray size of the sprayer.

[0045] (4) Place the raw materials of the acid soil conditioner in the disk of a disk granulator and start the granulator. Adjust the angle of the granulator to 55° and the rotation speed to 45 r / min, so that the raw materials rotate with the disk. Use a brush to continuously clean the raw materials adhered to the disk wall, making them gather in one place. At the same time, spray a small amount of binder solution into the disk. Continuously spray the binder or add raw materials according to the micro-nucleus situation to promote the continuous growth of micro-nuclei. After the particles grow to an appropriate size, take them out, screen out the particles with a diameter in the range of 1-4 mm, crush the larger particles, and put them back into the disk together with the small particles. Repeat the above steps until all the raw materials are granulated. Place the finished product in a constant-temperature drying oven and dry it at 30°C for 2 hours, controlling the moisture content at 12%. Obtain the acid soil particle conditioner.

[0046] Example 3

[0047] An acid soil particle conditioner

[0048] By weight, the raw materials of the acid soil particle conditioner in this example include 11 parts of slaked lime powder, 11 parts of calcium magnesium phosphate fertilizer, 59 parts of earthworm manure, 19.5 parts of attapulgite clay, 0.5 part of sodium carboxymethyl cellulose, and 50 parts of water; its preparation method specifically includes the following steps:

[0049] (1) Weigh slaked lime powder, calcium magnesium phosphate fertilizer, earthworm manure, attapulgite clay, sodium carboxymethyl cellulose, and water according to the above weight parts.

[0050] (2) Thoroughly mix the weighed slaked lime powder, calcium magnesium phosphate fertilizer, earthworm manure, and attapulgite clay, dry them at 60°C for 24 hours, and after natural cooling, grind them through a 20-mesh nylon sieve to obtain the raw materials of the acid soil conditioner.

[0051] 3. Mix the weighed sodium carboxymethyl cellulose and water to prepare a binder solution with a mass concentration of 1%, transfer it to a sprayer for standby, and adjust the size of the water sprayed by the sprayer.

[0052] 4. Place the raw materials of the acid soil conditioner in the disk of a disk granulator and start the granulator. Adjust the angle of the granulator to 55° and the rotation speed to 45 r / min, so that the raw materials rotate with the disk. Use a brush to continuously clean the raw materials adhered to the disk wall, making them gather in one place. At the same time, spray a small amount of binder solution into the disk. Continuously spray the binder or add raw materials according to the micro-nucleus situation to promote the continuous growth of micro-nuclei. After the particles grow to an appropriate size, take them out, screen out the particles with a diameter in the range of 1-4 mm, crush the larger particles, and put them back into the disk together with the small particles. Repeat the above steps until all the raw materials are granulated. Place the finished product in a constant-temperature drying oven and dry it at 30°C for 2 hours, controlling the moisture content at 12%. Obtain the acid soil particle conditioner.

[0053] Example 4

[0054] A kind of acidic soil granule conditioner

[0055] By weight, the raw materials of the acidic soil granule conditioner of this embodiment include 12 parts of slaked lime powder, 12 parts of calcium magnesium phosphate fertilizer, 61 parts of earthworm manure fertilizer, 14.5 parts of diatomaceous earth, 0.5 parts of sodium carboxymethyl cellulose and 50 parts of water; and the preparation method thereof specifically includes the following steps:

[0056] 1. According to the above weight proportions, weigh slaked lime powder, calcium magnesium phosphate fertilizer, earthworm manure fertilizer, diatomaceous earth, sodium carboxymethyl cellulose and water.

[0057] 2. Fully mix the weighed slaked lime powder, calcium magnesium phosphate fertilizer, earthworm manure fertilizer and diatomaceous earth, dry at 60°C for 24 hours, and grind through a 20-mesh nylon sieve after natural cooling to obtain the raw material of the acidic soil conditioner.

[0058] 3. Mix the weighed sodium carboxymethyl cellulose and water to prepare a binder solution with a mass concentration of 1%, transfer it into a spray pot for later use and adjust the amount of water sprayed from the spray pot.

[0059] 4. Place the raw material of the acidic soil conditioner in the disc of the disc granulator and start the granulator. Adjust the angle of the granulator to 55° and the speed to 45r / min, so that the raw material rotates with the disc, and use a brush to continuously clean the raw material bonded to the disc wall to gather it in one place. At the same time, spray a small amount of binder solution into the disc, and continuously spray the binder or add raw materials according to the micronucleus situation to promote the continuous growth of the micronucleus. After the particles grow to a suitable size, take them out, sieve out particles with a diameter of 1 to 4 mm, crush the larger particles, and put them back into the disc together with the small particles, repeat the above steps until the raw material is completely granulated, place the finished product in a constant temperature drying oven, dry it at 30°C for 2 hours, and control the moisture content at 12%. Obtain an acidic soil particle conditioner.

[0060] Example 5

[0061] A kind of acidic soil granule conditioner

[0062] By weight, the raw materials of the acidic soil granule conditioner of this embodiment include 12 parts of slaked lime powder, 12 parts of calcium magnesium phosphate fertilizer, 61 parts of earthworm manure fertilizer, 14.5 parts of bentonite, 0.5 parts of sodium carboxymethyl cellulose and 50 parts of water; and the preparation method thereof specifically includes the following steps:

[0063] 1. According to the above weight proportions, weigh slaked lime powder, calcium magnesium phosphate fertilizer, earthworm castings fertilizer, bentonite, sodium carboxymethyl cellulose and water.

[0064] 2. Weigh out the slaked lime powder, calcium magnesium phosphate fertilizer, earthworm manure, and bentonite, mix them thoroughly, dry them at 65 °C for 20 h, let them cool naturally, and then grind them through a 20-mesh nylon sieve to obtain the raw materials for the acidic soil conditioner.

[0065] 3. Mix the weighed sodium carboxymethyl cellulose and water to prepare a binder solution with a mass concentration of 1%, transfer it to a sprayer for standby, and adjust the water spray size of the sprayer.

[0066] 4. Place the raw materials for the acidic soil conditioner in the disk of a disk granulator, start the granulator, adjust the angle of the granulator to 55°, and the rotation speed to 45 r / min, so that the raw materials rotate with the disk. Use a brush to continuously clean the raw materials adhered to the disk wall to make them gather in one place. At the same time, spray a small amount of binder solution into the disk, continuously spray the binder or add raw materials according to the micro-nucleus situation to promote the continuous growth of micro-nuclei. After the particles grow to an appropriate size, take them out, screen out the particles with a diameter in the range of 1 - 4 mm, crush the larger particles, and put them back into the disk together with the small particles. Repeat the above steps until all the raw materials are granulated. Place the finished product in a constant-temperature drying oven and dry it at 30 °C for 2 h, controlling the moisture content at 12%. Obtain the acidic soil particle conditioner.

[0067] Example 6

[0068] An acidic soil particle conditioner

[0069] By weight, the raw materials of the acidic soil particle conditioner in this example include 12 parts of slaked lime powder, 12 parts of calcium magnesium phosphate fertilizer, 61 parts of earthworm manure, 14.5 parts of attapulgite, 0.5 part of calcium lignosulfonate, and 50 parts of water; its preparation method specifically includes the following steps:

[0070] 1. Weigh out the slaked lime powder, calcium magnesium phosphate fertilizer, earthworm manure, attapulgite, calcium lignosulfonate, and water according to the above weight parts.

[0071] 2. Mix the weighed slaked lime powder, calcium magnesium phosphate fertilizer, earthworm manure, and attapulgite thoroughly, dry them at 65 °C for 20 h, let them cool naturally, and then grind them through a 20-mesh nylon sieve to obtain the raw materials for the acidic soil conditioner.

[0072] 3. Mix the weighed calcium lignosulfonate and water to prepare a binder solution with a mass concentration of 1%, transfer it to a sprayer for standby, and adjust the water spray size of the sprayer.

[0073] 4. Place the raw materials of the acidic soil conditioner in the disk of a disk granulator, start the granulator, adjust the angle of the granulator to 55°, and the rotation speed to 45 r / min. Let the raw materials rotate with the disk, and continuously clean the raw materials adhered to the disk wall with a brush to make them gather together. At the same time, spray a small amount of binder solution into the disk, and continuously spray the binder or add raw materials according to the micro-nucleus situation to promote the continuous growth of micro-nuclei. After the particles grow to an appropriate size, take them out, screen out the particles with a diameter in the range of 1 - 4 mm, crush the larger particles, and re-put them into the disk together with the small particles. Repeat the above steps until all the raw materials are granulated. Place the finished product in a constant-temperature drying oven and dry it at 70 °C for 0.5 h, controlling the moisture content at 20%. Obtain the acidic soil particle conditioner.

[0074] Example 7

[0075] An acidic soil particle conditioner

[0076] By weight, the raw materials of the acidic soil particle conditioner in this example include 12 parts of slaked lime powder, 12 parts of calcium magnesium phosphate fertilizer, 61 parts of earthworm manure, 14.5 parts of attapulgite clay, 0.5 part of polyvinyl alcohol, and 50 parts of water; its preparation method specifically includes the following steps:

[0077] 1. Weigh slaked lime powder, calcium magnesium phosphate fertilizer, earthworm manure, attapulgite clay, polyvinyl alcohol, and water according to the above mass percentages.

[0078] 2. Thoroughly mix the weighed slaked lime powder, calcium magnesium phosphate fertilizer, earthworm manure, and attapulgite clay, dry them at 60 °C for 24 h, naturally cool them, and grind them through a 20-mesh nylon sieve to obtain the raw materials of the acidic soil conditioner.

[0079] 3. Mix the weighed polyvinyl alcohol and water to prepare a binder solution with a mass concentration of 1%, transfer it to a sprayer for standby, and adjust the size of the water sprayed by the sprayer.

[0080] 4. Place the raw materials of the acidic soil conditioner in the disk of a disk granulator, start the granulator, adjust the angle of the granulator to 60°, and the rotation speed to 30 r / min. Let the raw materials rotate with the disk, and continuously clean the raw materials adhered to the disk wall with a brush to make them gather together. At the same time, spray a small amount of binder solution into the disk, and continuously spray the binder or add raw materials according to the micro-nucleus situation to promote the continuous growth of micro-nuclei. After the particles grow to an appropriate size, take them out, screen out the particles with a diameter in the range of 1 - 4 mm, crush the larger particles, and re-put them into the disk together with the small particles. Repeat the above steps until all the raw materials are granulated. Place the finished product in a constant-temperature drying oven and dry it at 30 °C for 24 h, controlling the moisture content at 5%. Obtain the acidic soil particle conditioner.

[0081] Example 8

[0082] A kind of acidic soil granule conditioner

[0083] By weight, the raw materials of the acidic soil granule conditioner of this embodiment include 12 parts of slaked lime powder, 12 parts of calcium magnesium phosphate fertilizer, 61 parts of earthworm manure fertilizer, 14.5 parts of attapulgite, 0.5 parts of polyacrylamide and 50 parts of water; and the preparation method thereof specifically includes the following steps:

[0084] 1. According to the above mass percentages, weigh slaked lime powder, calcium magnesium phosphate fertilizer, vermicompost fertilizer, attapulgite, polyacrylamide and water.

[0085] 2. Fully mix the weighed slaked lime powder, calcium magnesium phosphate fertilizer, earthworm manure and attapulgite, dry at 60°C for 24 hours, and grind through a 20-mesh nylon sieve after natural cooling to obtain the raw material of the acidic soil conditioner.

[0086] 3. Mix the weighed polyacrylamide and water to prepare a binder solution with a mass concentration of 1%, transfer it into a spray pot for later use and adjust the amount of water sprayed from the spray pot.

[0087] 4. Place the raw material of the acidic soil conditioner in the disc of the disc granulator and start the granulator. Adjust the angle of the granulator to 40° and the speed to 50r / min, so that the raw material rotates with the disc, and use a brush to continuously clean the raw material bonded to the disc wall to gather it in one place. At the same time, spray a small amount of binder solution into the disc, and continuously spray the binder or add raw materials according to the micronucleus situation to promote the continuous growth of the micronucleus. After the particles grow to a suitable size, take them out, sieve out particles with a diameter of 1 to 4 mm, crush the larger particles, and put them back into the disc together with the small particles, repeat the above steps until the raw material is completely granulated, place the finished product in a constant temperature drying oven, dry it at 120°C for 0.5h, and control the moisture content at 10%. Obtain an acidic soil particle conditioner.

[0088] Comparative Example 1

[0089] A soil particle conditioner

[0090] The raw materials of the soil particle conditioner of this comparative example include 12 parts of slaked lime powder, 12 parts of calcium magnesium phosphate fertilizer, 61 parts of earthworm manure fertilizer, 15 parts of attapulgite and 50 parts of water by weight; and the preparation method thereof specifically includes the following steps:

[0091] 1. Weigh slaked lime powder, calcium magnesium phosphate fertilizer, earthworm manure fertilizer, attapulgite and water according to weight.

[0092] 2. Fully mix the weighed slaked lime powder, calcium magnesium phosphate fertilizer, earthworm manure and attapulgite, dry at 60°C for 24 hours, and grind through a 20-mesh nylon sieve after natural cooling to obtain the soil conditioner raw material.

[0093] 3. Weigh the water and put it into a sprayer for standby, and adjust the water spray size of the sprayer.

[0094] 4. Place the raw materials of the soil conditioner in the disk of a disk granulator, start the granulator, adjust the angle of the granulator to 55°, and the rotation speed to 45 r / min, so that the raw materials rotate with the disk. Use a brush to continuously clean the raw materials adhered to the disk wall, and make them gather together. At the same time, spray a small amount of water into the disk, and continuously spray water or add raw materials according to the micro-nucleus situation to promote the continuous growth of the micro-nucleus. After the particles grow to an appropriate size, take them out, screen out the particles with a diameter in the range of 1-4 mm, crush the larger particles, and put them back into the disk together with the small particles. Repeat the above steps until the raw materials are granulated. Place the finished product in a constant temperature drying oven and dry it at 30°C for 2 hours, controlling the moisture content at 12%. Obtain the soil particle conditioner.

[0095] Control Example 2

[0096] A soil particle conditioner

[0097] By weight, the raw materials of the soil particle conditioner in this control example include 17 parts of slaked lime powder, 17 parts of calcium magnesium phosphate fertilizer, 65.5 parts of earthworm manure, 0.5 part of sodium carboxymethyl cellulose and 50 parts of water; its preparation method specifically includes the following steps:

[0098] 1. Weigh slaked lime powder, calcium magnesium phosphate fertilizer, earthworm manure, sodium carboxymethyl cellulose and water according to the above mass percentages.

[0099] 2. Thoroughly mix the weighed slaked lime powder, calcium magnesium phosphate fertilizer and earthworm manure, dry them at 60°C for 24 hours, and grind them through a 20-mesh nylon sieve after natural cooling to obtain the raw materials of the soil conditioner.

[0100] 3. Mix the weighed sodium carboxymethyl cellulose and water to prepare a binder solution with a mass concentration of 1%, transfer it to a sprayer for standby, and adjust the water spray size of the sprayer.

[0101] 4. Place the raw materials of the soil conditioner in the disk of a disk granulator and start the granulator. Adjust the angle of the granulator to 55° and the rotation speed to 45 r / min, so that the raw materials rotate with the disk. Use a brush to continuously clean the raw materials adhered to the disk wall, making them gather in one place. At the same time, spray a small amount of binder solution into the disk. Continuously spray the binder or add raw materials according to the micro-nucleus situation to promote the continuous growth of micro-nuclei. After the particles grow to an appropriate size, take them out, screen out the particles with a diameter in the range of 1 - 4 mm, crush the larger particles, and put them back into the disk together with the small particles. Repeat the above steps until all the raw materials are granulated. Place the finished product in a constant temperature drying oven and dry it at 30°C for 2 h, controlling the moisture content at 12%. Obtain the soil particle conditioner.

[0102] Example 9

[0103] Measure the strength and granulation rate of the acidic soil particle conditioners prepared in Examples 1 - 8 and the soil particle conditioners prepared in Control Examples 1 - 2. The results are shown in Table 1.

[0104] As can be seen from Table 1 by comparing Control Example 1 with Examples 1 - 8, after adding the binder to the conditioner, the particle strength is significantly improved, rising from 4.05 N to 8.33 N, and the granulation rate is also significantly increased, from 75.92% to 93.16%. This shows that the addition of the binder increases the bonding effect between the raw materials, achieving the effect of increasing the mechanical strength of the particles. By comparing Control Example 2 with Examples 1 - 5, it can be seen that the addition of the filler can also significantly improve the particle strength from 3.59 N to 8.33 N, and the granulation rate also increases from 69.66% to 93.16%.

[0105] Table 1 Influence of acidic soil particle conditioner on particle strength and granulation rate

[0106]

[0107]

[0108] Example 10

[0109] Application of acidic soil particle conditioner

[0110] Add the acidic soil particle conditioners prepared in Examples 1 - 5 to the soil to measure the performance changes of the soil. At the same time, no conditioner is added to the soil as a blank group. The test crop is corn.

[0111] 1. Collect the 0 - 20 cm surface acidic soil for pot experiments, and measure the pH value in the soil as 5.04, exchangeable H + and Al 3+The contents are 0.57 cmol / kg and 1.92 cmol / kg, the total amount of exchangeable acid is 2.48 cmol / kg, the cation exchange capacity is 6.72 cmol / kg, and the total amount of exchangeable base ions is 4.24 cmol / kg.

[0112] 2. Add the acidic soil particle conditioners prepared in Examples 1 to 5 to the acidic soil respectively according to a mass ratio of 1:2000, and mix evenly.

[0113] 3. Load 10 kg of the soil prepared in step 2 into each pot, apply conventional chemical fertilizers (N 0.43 g / kg, P 1.13 g / kg, K 0.12 g / kg), sow corn 3 days later, set 3 replicates, manage according to the conventional method, end the experiment after 105 days, and harvest soil samples.

[0114] 4. Through the static water release experiment, use the constant temperature extraction method at 25 °C (refer to HGT 4216-2011) to measure the slow release performance of the acidic soil particle conditioner. Specifically: Take 100 mL of distilled water and place it in a glass bottle and put it into a biochemical constant temperature incubator at 25 °C. Take 7.5 g of the acidic soil particle conditioners prepared in Examples 1 to 5 respectively and place them in nylon bags with a mesh size of 100 meshes, 9 cm long and 7.5 cm wide. Seal the bag mouths and put them into the already constant temperature glass bottles, and then put them into the biochemical constant temperature incubator at 25 °C for cultivation. Each sample is repeated three times. The results are shown in Table 2. It can be seen from Table 2 that the acidic soil particle conditioner has a certain slow release effect. Compared with the blank group, the nitrogen cumulative release rates in Examples 1 to 5 are significantly lower than those in the blank group, and the lowest nitrogen cumulative release rate drops to 24.74%.

[0115] Table 2 Nitrogen cumulative release rate of acidic soil particle conditioner within 24 h

[0116] Nitrogen cumulative release rate (%) Blank group 34.25 Example 1 30.67 Example 2 25.85 Example 3 24.74 Example 4 27.03 Example 5 28.20

[0117] 5. Measure the pH value, exchangeable H + , exchangeable Al 3+ , total amount of exchangeable acid, cation exchange capacity, total amount of exchangeable base ions. The results are shown in Tables 3 and 4.

[0118] As can be seen from Table 3, after treating the soil with the acidic soil particle conditioner, compared with the blank group, the pH values of Examples 1-5 increased by 1.30, 1.33, 1.35, 1.28 and 1.35 units respectively. At the same time, after adding the acidic soil particle conditioner, compared with the blank group, the content of exchangeable hydrogen decreased from 0.90 cmol / kg to 0.59-0.64 cmol / kg, the content of exchangeable aluminum decreased from 1.53 cmol / kg to 0.57-0.62 cmol / kg, and the total amount of exchangeable acid decreased from 2.43 cmol / kg to 1.17-1.28 cmol / kg, with an obvious decrease. This shows that the acidic soil particle conditioner has a significant improvement effect on soil acidity and can reduce the exchangeable H + , exchangeable Al 3+ and the total amount of exchangeable acid, thereby increasing the pH value of acidic soil.

[0119] It can be found from Table 4 that the acidic soil particle conditioner has a significant impact on the soil buffering performance. Compared with the blank group, the cation exchange capacity of Example 1 increased from 9.71 cmol / kg to 11.81 cmol / kg, and the total amount of exchangeable base ions also increased from 7.28 cmol / kg to 10.55 cmol / kg. This indicates that the acidic soil particle conditioner can effectively increase the cation exchange capacity and the total amount of exchangeable base ions of the soil, thereby enhancing the buffering capacity of the soil.

[0120] Table 3 Effects of Acidic Soil Particle Conditioner on Soil pH Value and Exchangeable Acid

[0121]

[0122] Table 4 Effects of Acidic Soil Particle Conditioner on Soil Buffering Performance

[0123]

[0124] 6. The above-ground biomass and yield of corn were measured, and the results are shown in Table 5. As can be seen from Table 5, the acidic soil particle conditioner has a significant improvement on the growth of crops. Compared with the blank group, the above-ground biomass of Examples 1-5 increased by 37.75, 85.02, 43.21, 38.54 and 10.69 g / pot respectively, and the ear weight yields of Examples 1-5 increased by 13.51, 13.09, 22.51, 10.77 and 5.53 g / pot respectively. This indicates that after applying the acidic soil particle conditioner, it can improve crop growth and thus promote yield increase.

[0125] Table 5 Effects of Acidic Soil Particle Conditioner on Above-ground Biomass and Yield of Corn

[0126]

[0127]

[0128] In summary, as can be seen from Tables 1 to 5, an acidic soil particle conditioner provided by the present invention can effectively increase the pH value of acidic soil, the soil acid buffering capacity, reduce the exchangeable acid in the soil, and at the same time increase the crop yield.

[0129] Other parts not described in detail are all prior art. Although the above embodiments have made a detailed description of the present invention, they are only a part of the embodiments of the present invention, rather than all the embodiments. People can also obtain other embodiments based on these embodiments without creative efforts, and these embodiments all fall within the protection scope of the present invention.

Claims

1. An acidic soil particle conditioner, characterized in that: The raw materials of the acidic soil granule conditioner include 5 to 20 parts of slaked lime powder, 5 to 20 parts of calcium magnesium phosphate fertilizer, 50 to 68 parts of earthworm manure fertilizer, 1 to 30 parts of filler, 0.5 to 3 parts of binder and 45 to 50 parts of water by weight.

2. The acidic soil granule conditioner according to claim 1, characterized in that: The particle diameter of the acidic soil particle conditioner is 1-4 mm, and the water content of the acidic soil particle conditioner is 5-20%.

3. The acidic soil granule conditioner according to claim 1, characterized in that: Calculated by weight percentage, the raw materials of the acidic soil granule conditioner include 11 to 13 parts of slaked lime powder, 11 to 13 parts of calcium magnesium phosphate fertilizer, 59 to 64 parts of earthworm manure fertilizer, 9.5 to 19.5 parts of filler, 0.5 part of binder and 50 parts of water.

4. The acidic soil granule conditioner according to claim 3, characterized in that: The filler is any one of attapulgite, diatomite and bentonite; the binder is any one of polyvinyl alcohol, polyacrylamide, calcium lignin sulfonate and sodium carboxymethyl cellulose.

5. The acidic soil granule conditioner according to claim 4, characterized in that: The raw materials of the acidic soil granule conditioner include 11 parts of slaked lime powder, 11 parts of calcium magnesium phosphate fertilizer, 59 parts of earthworm manure fertilizer, 19.5 parts of attapulgite, 0.5 parts of sodium carboxymethyl cellulose and 50 parts of water by weight.

6. The acidic soil granule conditioner according to claim 4, characterized in that: The raw materials of the acidic soil granule conditioner include 12 parts of slaked lime powder, 12 parts of calcium magnesium phosphate fertilizer, 61 parts of earthworm manure fertilizer, 14.5 parts of diatomaceous earth, 0.5 parts of sodium carboxymethyl cellulose and 50 parts of water by weight.

7. A method for preparing the acidic soil granular conditioner according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) Weigh slaked lime powder, calcium magnesium phosphate fertilizer, earthworm manure fertilizer, filler, binder and water according to the above weight parts; (2) mixing the weighed slaked lime powder, calcium magnesium phosphate fertilizer, earthworm manure fertilizer and filler, drying, cooling and sieving to obtain a raw material for an acidic soil conditioner; (3) mixing the weighed binder and water to prepare a binder solution with a mass concentration of 1 to 2%; (4) Placing the acidic soil conditioner raw material on the disc of the disc granulator and starting granulation, spraying the binder solution during the granulation to obtain a granular product, and drying the granular product to a moisture content of 5 to 20%, thereby obtaining the acidic soil granular conditioner.

8. The preparation method according to claim 7, characterized in that: In the step (2), the drying temperature is 60-65° C., the drying time is 20-24 hours, and the sieving is a 20-mesh nylon sieve; In the step (3), the mass concentration of the binder solution is 1%; In the step (4), the angle of the disc granulator is adjusted to 40-60°, the rotation speed is 30-50 r / min, and the drying conditions are 30-120° C. and 0.5-24 h.

9. Use of the acidic soil granule conditioner according to any one of claims 1 to 6 in improving soil buffering performance, characterized in that: The acidic soil particle conditioner is added to the soil at a mass ratio of 1:2000-2200 to improve the soil buffering performance; The soil is acidic soil with a pH value of 4.5 to 5.

5.

10. Use of the acidic soil granule conditioner according to any one of claims 1 to 6 in increasing corn yield.

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