CN111849498A

CN111849498A - Soil conditioner and preparation method thereof

Info

Publication number: CN111849498A
Application number: CN202010701860.3A
Authority: CN
Inventors: 陈家锋
Original assignee: Discochemical Industry Group Yichang Co ltd
Current assignee: Discochemical Industry Group Yichang Co ltd
Priority date: 2020-07-20
Filing date: 2020-07-20
Publication date: 2020-10-30

Abstract

The invention relates to a soil conditioner, which is a solidified and molded granule, and the particle size of the granule is 2.0-3.8 mm; the raw materials comprise the following components in percentage by weight: 4% of biological fulvic acid, 5% of quicklime, 15% to 18% of light burned magnesium, 10% to 12% of calcite powder, 60% to 65% of dolomite powder and 1% of potassium humate. The preparation method of the soil conditioner comprises the following steps: (1) uniformly mixing calcite powder and dolomite powder to obtain mixed powder; (2) adding 20% of water into the mixed powder to be adjusted into slurry; (3) adding biological fulvic acid and potassium humate into the slurry, and uniformly stirring; (4) adding quicklime and light burned magnesium into the slurry, and uniformly stirring; (5) granulating when the slurry in the step (4) is self-heated and dehydrated to be in a dry mud shape; (6) standing the granular soil conditioner, curing and molding after secondary heat release to obtain a finished soil conditioner with the grain diameter of 2.0-3.8 mm.

Description

Soil conditioner and preparation method thereof

Technical Field

The invention belongs to the technical field of soil improvement, and particularly relates to a soil conditioner and a preparation method thereof.

Background

The use of nitrogenous fertilizer, phosphate fertilizer and potash fertilizer in agricultural production in China has been over 40 years old, and when the fertilizers are used, the soil acidification phenomenon is serious, so that the continuity of agricultural production is influenced. Soil conditioners have been used as a main technical means for treating acidified soil for more than 20 years at home.

The soil conditioner is also called soil conditioner, is a medicine for conditioning elements of soil, is pollution-free and pollution-free, and is suitable for agriculture. The soil conditioner aims at the soil with nutrition loss caused by overuse or pollution, and can improve the physical, chemical and microbial reactions of the soil and increase the fertility of the soil.

The existing soil conditioner generally has the following functions. Firstly, the soil aggregate structure can be changed, the capillary pores and the non-capillary pores of the soil are increased, the volume weight of the soil is reduced, the air permeability of the soil is increased, the saturation hydraulic conductivity is increased, the water storage is kept, the evaporation is reduced, and the utilization efficiency of rainfall is effectively improved. And secondly, the chemical properties of the soil can be improved, the organic matters of the soil can be increased, the pH value of the soil can be adjusted, and the buffering capacity of the soil can be enhanced. Then, the soil water erosion resistance can be increased, the water stability aggregate content of the soil can be obviously increased by the high molecular polymer soil conditioner, the soil water erosion resistance is increased, and the water and soil loss is correspondingly reduced. And then, the ion exchange rate of the soil can be improved, the saline-alkali soil can be improved, and heavy metals can be adsorbed. Mineral modifiers such as zeolite, bentonite, vermiculite and the like increase cations in soil, some heavy metals in the soil are exchanged and adsorbed or fixed, and the concentration of hydrogen ions is reduced due to exchange and adsorption. Then, the number of soil microorganisms can be increased, and the enzyme activity is improved; the microorganisms in the soil can grow only by organic carbon, and the application of the organic carbon soil conditioner can increase the number and activity of the microorganisms in the soil, inhibit the activities of fungi, bacteria and actinomycetes and reduce soil-borne diseases. Finally, the soil fertility and the crop yield can be improved, the soil conditioner contains a large amount of trace elements and organic substances, the growth of crops is facilitated, and the product quality is improved.

The existing soil conditioner has problems in actual production and use. The soil conditioner in the current market has different component ratios according to different functions and efficacies, and the finally formed product forms generally have the following three forms, namely powder, granules and water. The powder is difficult to scatter, is not easy to be preserved in soil for a long time, is easy to permeate underground along with rainwater, has poor conditioning effect and is easy to pollute underground water. Although the water aqua can be retained in soil to a certain extent by depending on the water storage capacity of the soil, the water aqua has a certain conditioning effect, the conditioning is easy to lose efficacy along with the evaporation of water, long-time timed and quantitative sowing is needed to produce the effect, and the cost is high. Therefore, the granular conditioner is in a form of conditioner which is easy to scatter, can be kept in soil for a long time and has better conditioning effect at present. However, the preparation process of the granular conditioner is complex, sometimes needs to be accompanied with processes such as sintering and forming, at present, most of domestic granular conditioners are produced by calcining raw materials such as limestone, dolomite, potassium feldspar and medical stone in a rotary kiln, a vertical kiln and a tunnel kiln and then adopting a crushing and granulating process, and have high requirements on the granulating and forming processes and high production cost.

Disclosure of Invention

The invention provides a soil conditioner and a preparation method thereof aiming at the technical problems in the prior art, and solves the problems that the existing powdery soil conditioner is difficult to scatter, is difficult to be preserved in soil for a long time, is easy to permeate underground along with rainwater, has poor conditioning effect and is easy to pollute underground water; the granular conditioner is easy to scatter, can be kept in soil for a long time, and has good conditioning effect, but the preparation process is complex, and sometimes needs to be accompanied with sintering and forming processes, so that the requirements on the granulating and forming processes are high, the production cost is high, and the like.

The technical scheme for solving the technical problems is as follows:

a soil conditioner is a solidified granule, and the particle size of the granule is 2.0-3.8 mm; the raw materials comprise the following components in percentage by weight: 4% of biological fulvic acid, 5% of quicklime, 15% to 18% of light burned magnesium, 10% to 12% of calcite powder, 60% to 65% of dolomite powder and 1% of potassium humate.

On the basis of the technical scheme, the invention can be further improved as follows.

Preferably, the raw materials comprise the following components in percentage by weight: 4% of biological fulvic acid, 5% of quicklime, 15% to 16% of light burned magnesium, 11% to 12% of calcite powder, 62% to 63% of dolomite powder and 1% of potassium humate.

Wherein the dolomite powder contains 27 percent of Ca and 16 percent of Mg.

Wherein the fineness of the quicklime, the light calcined magnesium, the calcite powder and the dolomite powder is 100-200 meshes.

Preferably, the fineness of the quicklime, the light calcined magnesium, the calcite powder and the dolomite powder is 150-200 meshes.

The invention also provides a preparation method of the soil conditioner, which comprises the following steps: (1) uniformly mixing calcite powder and dolomite powder to obtain mixed powder; (2) adding 20% of water into the mixed powder to be adjusted into slurry; (3) adding biological fulvic acid and potassium humate into the slurry obtained in the step (2), and uniformly stirring; (4) adding quicklime and light burned magnesium into the slurry obtained in the step (3), and uniformly stirring; (5) granulating when the slurry in the step (4) is self-heated and dehydrated to be in a dry mud shape; (6) and (5) standing the granular soil conditioner obtained in the step (5), curing and forming after secondary heat release to obtain a finished soil conditioner with the particle size of 2.0-3.8 mm.

Wherein in the step (5), after the light burned magnesium is added into the slurry for 1.2-1.5 h, granulation is started.

Wherein, in the step (5), the mixture is granulated by a granulator.

Further, the preparation method also comprises the step (7) of inspecting, packaging and warehousing the finished soil conditioner.

Wherein, in the step (7), after the light burned magnesium is added into the slurry for 14h, the inspection, the packaging and the warehousing are started.

The invention has the beneficial effects that:

(1) according to the invention, the soil conditioner is molded by utilizing the characteristic that the light burned magnesium releases heat after meeting water without calcining, so that the energy consumption and the production cost can be obviously reduced, the economic benefit is great, the commercial success can be achieved, and the biological fulvic acid and potassium humate can be effectively ensured not to be decomposed and lose efficacy due to high temperature in the preparation process;

(2) the soil conditioner has a good sowing effect, can be kept in soil for a long time, has a good PH value control effect, and can effectively adjust the PH value of acid soil; meanwhile, after the granular soil conditioner prepared by the invention is combined with soil for a long time, the soil hardening condition is effectively improved, the soil air permeability is increased, the soil bulkiness is improved, the water and fertilizer retention performance and the buffering performance of the soil are enhanced, the soil structure is improved, the survival of beneficial flora in the soil is facilitated, the biological sterilization effect is improved, the plant root system has a healthy growth environment, and the disease and insect pest resistance and crop yield of crops are improved.

Detailed Description

The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.

The quicklime mainly contains calcium oxide (CaO), and reacts with water to generate calcium hydroxide (Ca (OH)₂) I.e., slaked lime, and gives off heat.

The light-burned magnesium has a pore structure and high reactivity, is easy to carry out solid phase reaction or sintering, reacts with water to generate Mg (OH)2 to be hardened, and has binding capacity. The cycle of the light-burned magnesium heat release when meeting water comprises four stages and two heat release peaks, and the second heat release peak is larger than the first heat release peak. Specifically, the method comprises (1) a hydration induction prophase: mixing, feeding and forming to release heat rapidly within 10min to form a first heat release peak; (2) hydration induction period: feeding the materials for 60min, and slowing the hydration reaction; (3) hydration acceleration period: a second exothermic peak appears in hydration exothermic within 240min of feeding; (4) hydration deceleration stabilization period: the rate of the reaction gradually decreased from the top of the second exothermic peak until the reaction stabilized, and the hydration reaction was terminated within 14 hours. The initial setting time is 1.5h, and the final setting time is 4-5 h. According to the invention, the soil conditioner is molded by utilizing the characteristic that the light burned magnesium releases heat after meeting water without calcining, so that the energy consumption and the production cost can be obviously reduced, and the biological fulvic acid and potassium humate can be effectively prevented from being decomposed and losing efficacy due to high temperature in the preparation process.

In addition, the higher the exotherm during the preparation of the soil conditioner, as the amount of light-burned magnesium used increased. When the usage amount of quicklime is 4% and the usage amount of light-burned magnesium is 15% -18%, the soil conditioner can be solidified and molded; continued increase in the amount of light-burned magnesium will overheat, causing the soil conditioner to be unabsorbed by the soil. The factors such as the preparation cost, the preparation efficiency, the heat loss and the like of the soil conditioner are comprehensively considered, and the light-burned magnesium with the use amount of 15-16% is a better process parameter.

Calcite is a calcium carbonate mineral, which is the most common of natural calcium carbonates. The dolomite powder is white or light grey white powder, and is natural double salt of calcium carbonate and magnesium carbonate. The dolomite powder of the invention contains 27% of Ca and 16% of Mg.

Calcium and magnesium are essential elements of plants. Among them, calcium has the following main functions: (1) calcium is combined with pectic acid and then fixed in cell walls, so that the cell walls are stabilized, the plant structure is reinforced, and the disease resistance and lodging resistance of plants are enhanced; (2) the protoplasm colloid is adjusted, so that the cells are water-filled and elastic, the cell elongation is facilitated, and the fruit atrophy is reduced; (3) calcium maintains some important activities, so that the plants can grow normally; (4) regulating the pH value of cell sap and the temperature of the intracellular environment to prevent organic acid from accumulating in plants and poisoning; (5) promoting the absorption of nitrate chlorine by plants; (6) improve the physical and chemical properties of soil.

The main functions of magnesium are: (1) magnesium is the central atom of the chlorophyll molecule, and the photosynthesis can not separate from magnesium; (2) promoting amino acid to synthesize protein, and if magnesium is deficient, the amino acid can be accumulated, so that the plant is susceptible to diseases; (3) magnesium participates in all phosphoric acid conversion processes in the synthesis and conversion processes of nutrition, so that the yield is seriously influenced by magnesium deficiency; (4) magnesium and sulfur act simultaneously, and the oil content of the plant can be greatly increased.

Meanwhile, the slight surplus of calcium and magnesium can cause toxicity to plants and influence the yield and quality of crops. Crops that accumulate excessive amounts of medium and trace elements also further affect human and animal health. There are also some medium trace elements, which, although having little influence on the growth of plants, enter the animal body through the food chain when excessive, causing animal poisoning. For example, excessive magnesium intake, 1.5-2.5mmol/L serum magnesium, is often accompanied by gastrointestinal reactions such as nausea, gastrointestinal spasm, etc.; when the magnesium in the serum is increased to 2.5-3.3mmo1/L, lethargy, myasthenia, weak knee tendon reflex and muscle paralysis occur; when the serum magnesium is increased to 5mmo1/L, the deep tendon reflex disappears; paralysis of voluntary or respiratory muscles can occur when the serum magnesium exceeds 5mmo 1/L; complete cardiac block or cardiac arrest may occur with serum magnesium 7.5mmol/L or higher. In addition, because of competitive inhibition in human bodies, calcium is excessive, the bioavailability of iron, zinc, magnesium and phosphorus is also seriously influenced, and the pregnant women can suffer from urinary calculus, hypercalcemia, alkalosis and other hazards.

In conclusion, the dosage of the calcite powder is 10-12%, and the dosage of the dolomite powder is 60-65% so as to adjust the contents of calcium and magnesium, improve acid soil and increase the absorption of calcium and magnesium by plants.

The potassium humate is a high-efficiency organic potassium fertilizer, and the humic acid is a bioactive preparation, so that the quick-acting potassium content of soil can be increased, the potassium loss and fixation can be reduced, the potassium absorption and utilization rate of crops can be increased, and the potassium humate fertilizer has the functions of improving soil, promoting crop growth, improving the stress resistance of crops, improving crop quality, protecting agricultural ecological environment and the like. Potassium humate is a high molecular heterogeneous aromatic hydroxy carboxylate, is black particle or powdery solid in appearance, is a product obtained by finely selecting lignite and then reacting and extracting the lignite with KOH liquid, is dissolved in water to be alkaline, and contains active groups such as hydroxyl groups, phenolic hydroxyl groups and the like.

According to the invention, by adding the biological fulvic acid and potassium humate, the content of organic matters in soil is effectively increased, the granular structure of soil is improved, the air permeability is increased, the water and fertilizer are preserved, the acid-base property of soil is improved, the survival of beneficial flora in soil is facilitated, the biological sterilization effect is improved, the plant root system has a healthy growth environment, and the capability of resisting diseases and insect pests of crops is improved.

Preferably, the raw materials of the soil conditioner comprise the following components in percentage by weight: 4% of biological fulvic acid, 5% of quicklime, 15% to 16% of light burned magnesium, 11% to 12% of calcite powder, 62% to 63% of dolomite powder and 1% of potassium humate. The technical effect of the preferred scheme of the invention is better.

Wherein the fineness of the quicklime, the light calcined magnesium, the calcite powder and the dolomite powder is 100-200 meshes. I.e., about 0.15mm for a 100 mesh screen, about 0.1mm for a 150 mesh screen, and about 0.074mm for a 200 mesh screen.

Preferably, the fineness of the quicklime, the light calcined magnesium, the calcite powder and the dolomite powder is 150-200 meshes so as to improve the comprehensive performance of the soil conditioner and the conditioning effect on soil.

According to the invention, the pH value of the acid soil can be obviously improved by calcite powder, quicklime, dolomite powder and the like, so that the pH value of the acid soil can be effectively adjusted, heavy metal elements and pollution elements can be adsorbed and fixed, the bioavailability of the heavy metal elements and the pollution elements in the soil can be reduced, the absorption of crops on the heavy metal elements and the pollution elements can be reduced, and the leaching loss of mineral elements can be reduced;

the soil conditioner is rich in various mineral nutrients such as calcium, potassium, magnesium and the like, so that comprehensive nutrition is supplemented for crops, and the stress resistance of the crops is improved; the soil fertilizer contains biological fulvic acid and potassium humate, effectively improves the content of organic matters in soil, enhances the water and fertilizer retention performance and the buffering performance of soil, improves the soil structure and the crop quality, is beneficial to the survival of beneficial flora in soil, improves the biological sterilization effect, enables the root system of a plant to have a healthy growth environment, and improves the disease and pest resistance of the crop and the crop yield;

The soil conditioner disclosed by the invention can effectively improve the soil hardening condition and improve the soil filling power after long-acting combination with soil.

A preparation method of a soil conditioner comprises the following steps:

(1) uniformly mixing calcite powder and dolomite powder to obtain mixed powder;

(2) adding 20% of water into the mixed powder to be adjusted into slurry;

(3) adding biological fulvic acid and potassium humate into the slurry obtained in the step (2), and uniformly stirring;

(4) adding quicklime and light burned magnesium into the slurry obtained in the step (3), and uniformly stirring;

(5) granulating when the slurry in the step (4) is self-heated and dehydrated to be in a dry mud shape;

(6) standing the granular soil conditioner obtained in the step (5), curing and forming after secondary heat release to obtain a finished soil conditioner with the particle size of 2.0-3.8 mm;

(7) and (5) inspecting, packaging and warehousing the finished soil conditioner.

Adding light-burned magnesium into the slurry to release heat rapidly within 10min to form a first exothermic peak; the hydration heat release of the light-burned magnesium added into the slurry appears a second heat release peak within 240 min.

Wherein, in the step (5), the mixture is granulated by a granulator.

According to the invention, the soil conditioner is molded by utilizing the characteristic that the light burned magnesium releases heat after meeting water without calcining, so that the energy consumption and the production cost can be obviously reduced, the economic benefit is great, the commercial success can be achieved, and the biological fulvic acid and potassium humate can be effectively ensured not to be decomposed and lose efficacy due to high temperature in the preparation process; the soil conditioner prepared by the invention is granules, has good sowing effect and can be retained in soil for a long time.

TABLE 1

In table 1, the preparation of examples 1-4, comprising the following steps:

(1) uniformly mixing calcite powder and dolomite powder to obtain mixed powder;

(2) adding 20% of water into the mixed powder to be adjusted into slurry;

(5) granulating by a granulator when the slurry in the step (4) is self-heated and dehydrated to be in a dry mud shape;

The preparation cost of the soil conditioner of the embodiments 1 to 4 of the invention is 600 yuan/ton, and the recommended spreading amount per mu of field is 5 kg. The preparation cost of the soil conditioner for spreading per mu of field is 600/1000 multiplied by 20-12 yuan, the selling price of the soil conditioner is 1.3 times of the preparation cost, the cost of the soil conditioner for spreading per mu of field is 15.6 yuan from 12 multiplied by 1.3-15.6 yuan.

Comparative example 1

The accession number of the XUELIONG soil conditioner is agricultural manure (2017) standard character 6936; the content of CaO is more than or equal to 24.0 percent, MgO is more than or equal to 15.0 percent, and the content of organic matter is more than or equal to 5.0 percent; pH value: 7.0 to 9.0; the country of origin: korea; specification: 20 kg; the shape is as follows: particles; granularity: (2.0 mm-4.75 mm) is more than or equal to 90 percent; dissolving in five minutes; selling price: 140 yuan/20 kg.

The recommended spreading amount of each mu of field is 20 kg-30 kg. The calculation shows that the cost of sowing the said soil conditioner is 140-210 yuan per mu field.

Comparative example 2

Conditioner special for acid soil, brand name: fulang parent soil No. 1; the technical indexes are as follows: potassium (K)₂O) is more than or equal to 3.0 percent, silicon (Si) is more than or equal to 9.0 percent, calcium (Ca) is more than or equal to 20.0 percent, and magnesium (Mg) is more than or equal to 2.0 percent; pH value: 8.0 to 11.0; specification: 40 kg; the shape is as follows: powder; selling price: 130 yuan/40 kg.

The recommended usage is as follows: the fertilizer is used as a base fertilizer, applied in furrows or scattered before turning the soil, and applied by rotary tillage.

The recommended spreading amount of each mu of field is 40 kg-80 kg. The cost of spreading the special conditioner for the acid soil per mu of field is 130 yuan to 260 yuan according to calculation.

Comparative example 3

The soil conditioner is well acidified after soil application, and the registration certificate number is No. 4 of agricultural fertilizer temporary letters (2009) 4142; the main components are as follows: organic matter is more than or equal to 20 percent, amino acid is more than or equal to 11 percent, and biochemical fulvic acid is more than or equal to 8 percent; pH value: 2.5 to 4.5; specification: 5 kg; the shape is as follows: powder; selling price: 166 yuan/5 kg.

The soil applying optimal acidizing soil conditioner is used for improving an obstacle middle and low yield field caused by acidizing and secondary salinization, improves the water permeation of soil by adjusting the physical and chemical properties of the soil, improves the organic matter content of the soil, and releases fixed beneficial elements.

The recommended application method is: after transplanting, watering the roots with root fixing water diluted by 200-300 times, and watering the roots with 1 kilogram of land per mu; irrigating for the second time 20 days after transplanting, and the using amount per mu is 2 kilograms; and the fertilizer is irrigated and applied once before the mass stage for the third time, and the dosage per mu is 2 kilograms. Can increase the organic matter content of the soil, promote the root system to be developed and improve the utilization rate of the fertilizer in the soil.

Namely, the recommended spreading amount per mu of field is 5 kg. That is, the cost of spreading the soil conditioner for applying the soil conditioner for acidification per mu of field is 166 yuan.

Examples 1 to 4 in table 1 are all examples of the present invention, comparative examples 1 to 3 are currently commercially available products and comparative examples of the present invention, and the soil conditioners of examples 1 to 4 and comparative examples 1 to 3 were tested for their respective correlation properties, and the test results are shown in table 2 below.

TABLE 2

Referring to table 2, it can be seen from the analysis of the performance test data of the soil conditioners of examples 1 to 4 and comparative examples 1 to 3 that the soil conditioners of examples 1 to 4 of the present invention can remain in the soil for a long time, which is significantly better than the soil conditioners of comparative examples 1 to 3; in addition, the soil conditioner of the embodiments 1 to 4 of the invention is granules, is easy to broadcast, is far superior to the powdery soil conditioner of the comparative examples 2 to 3, and can effectively solve the related technical problems in the prior art.

And (3) performing a sowing conditioning experiment by using the soil conditioner prepared in the embodiment 1-4 and the soil conditioner prepared in the comparative example 1-3, and selecting 7 acid soil experimental fields with the area of 1 mu, wherein the pH value of the experimental fields is 4.5-5. The soil conditioners of examples 1 to 4 and comparative examples 1 to 3 were respectively sown, and the sowing amount and cost per experimental field are shown in Table 3 below. In addition, the relevant indexes of each experimental field were measured every 5 days, and the data obtained are shown in table 4 below.

TABLE 3

Referring to table 3, it can be seen from the analysis of the spreading cost per mu of the soil conditioners of examples 1 to 4 and comparative examples 1 to 3 that the spreading cost per mu of the soil conditioners of examples 1 to 4 of the present invention is much lower than that of the soil conditioners of comparative examples 1 to 3, and that the soil conditioners of examples 1 to 4 of the present invention have significant economic benefits and can be commercially successful. Therefore, the technical scheme of the invention can obviously reduce energy consumption and production cost and has a technical effect obviously superior to that of comparative examples 1-3.

TABLE 4

Experimental field 1	5 days	10 days	15 days	20 days	25 days	30 days
							pH value	7.4	7.4	7.2	7.1	7.0	6.9
Organic matter	3.1	3.3	3.4	3.6	3.6	3.8
							Experimental field 2	5 days	10 days	15 days	20 days	25 days	30 days
pH value	7.3	7.3	7.2	7.2	7.2	7.2
							Organic matter	3.2	3.1	3.1	3.2	3.1	3.2
Experimental plot 3	5 days	10 days	15 days	20 days	25 days	30 days
							pH value	7.3	7.3	7.3	7.2	7.0	6.9
Organic matter	3.1	3.2	3.2	3.3	3.3	3.4
							Experimental field 4	5 days	10 days	15 days	20 days	25 days	30 days
pH value	7.5	7.2	7.0	6.8	6.6	6.6
							Organic matter	3.1	3.1	3.3	3.3	3.4	3.6
Experimental plot 5	5 days	10 days	15 days	20 days	25 days	30 days
							pH value	6.9	6.9	6.7	6.6	6.6	5.2
Organic matter	5.1	5.0	5.1	5.3	5.0	0.8
							Experimental plot 6	5 days	10 days	15 days	20 days	25 days	30 days
pH value	8.1	8.0	8.0	6.8	5.9	5.0
							Organic matter	43.6	43.5	43.9	18.6	5.3	1.2
Experimental plot 7	5 days	10 days	15 days	20 days	25 days	30 days
							pH value	7.2	7.2	7.2	7.1	6.3	5.1
Organic matter	20.1	20.0	20.3	21.0	6.2	0.9

Referring to table 4, according to the analysis of the test data of each experimental field in which the soil conditioner of examples 1 to 4 and comparative examples 1 to 3 was spread, it was found that the soil conditioner of examples 1 to 4 of the present invention could be retained in the soil for a long time and the conditioning effect on the soil of the experimental field was significantly superior to that of the soil conditioner of comparative examples 1 to 3. The soil conditioner can effectively adjust the pH value of acid soil, effectively improve the soil hardening condition, improve the soil filling power and enhance the water and fertilizer retention performance and the buffering performance of the soil after long-acting combination with the soil, has the technical effects obviously superior to those of comparative examples 1-3, and can effectively solve the related technical problems in the prior art.

The detection of the pH value is completed according to a method specified in an industry standard NYT1377-2007, and the detection of the organic matter content is completed according to a method specified in an industry standard NYT 85-1988.

And (3) adopting a sampling detection mode, uniformly selecting 20 detection sample points in each experimental field during each detection, and taking an average value as final detection data after the detection is finished.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The soil conditioner is characterized in that the soil conditioner is solidified granules with the particle size of 2.0-3.8 mm; the raw materials comprise the following components in percentage by weight: 4% of biological fulvic acid, 5% of quicklime, 15% to 18% of light burned magnesium, 10% to 12% of calcite powder, 60% to 65% of dolomite powder and 1% of potassium humate.

2. The soil conditioner of claim 1, wherein the raw materials comprise the following ingredients in weight percent: 4% of biological fulvic acid, 5% of quicklime, 15% to 16% of light burned magnesium, 11% to 12% of calcite powder, 62% to 63% of dolomite powder and 1% of potassium humate.

3. The soil conditioner according to claim 1 or 2, wherein the dolomite powder has a Ca content of 27% and a Mg content of 16%.

4. The soil conditioner according to claim 1 or 2, wherein the fineness of the quicklime, the light calcined magnesium, the calcite powder and the dolomite powder is 100-200 meshes.

5. The soil conditioner according to claim 4, wherein the fineness of the quicklime, the light calcined magnesium, the calcite powder and the dolomite powder is 150-200 meshes.

6. A process for the preparation of a soil conditioner according to any one of claims 1 to 5, comprising the steps of: (1) uniformly mixing calcite powder and dolomite powder to obtain mixed powder; (2) adding 20% of water into the mixed powder to be adjusted into slurry; (3) adding biological fulvic acid and potassium humate into the slurry obtained in the step (2), and uniformly stirring; (4) adding quicklime and light burned magnesium into the slurry obtained in the step (3), and uniformly stirring; (5) granulating when the slurry in the step (4) is self-heated and dehydrated to be in a dry mud shape; (6) and (5) standing the granular soil conditioner obtained in the step (5), curing and forming after secondary heat release to obtain a finished soil conditioner with the particle size of 2.0-3.8 mm.

7. The preparation method according to claim 6, wherein in the step (5), the granulation is started after the light burned magnesium is added into the slurry for 1.2 to 1.5 hours.

8. The method according to claim 6, wherein in the step (5), the granules are granulated by a granulator.

9. The preparation method of claim 6, further comprising the step (7) of inspecting, packaging and warehousing the finished soil conditioner.

10. The preparation method according to claim 9, wherein in the step (7), after the light burned magnesium is added into the slurry for 14 hours, the inspection, packaging and warehousing are started.