Conditioner for improving soil environment

Abstract

A conditioner for improving a soil environment belongs to the field of soil environment improvement and comprises the following substances in parts by weight: 6-8 parts of activated calcium silicate, 12-15 parts of red mud, 3-5 parts of selenocysteine, 4-6 parts of a composite decomposition microbial agent, 3-5 parts of boric acid, 4-6 parts of ferrous sulfate, 6-8 parts of aminated alginic acid, 15-20 parts of monopotassium phosphate, 6-10 parts of plant ash and 3-5 parts of chitosan. Through the synergistic effect of all the raw materials, heavy metals in soil can be efficiently fixed and removed from multiple dimensions, meanwhile, rich nutrient elements and beneficial microorganisms are supplemented for the soil, on the basis of reducing the bioavailability of the heavy metals and relieving the harm of the heavy metals to the ecological environment, the physicochemical properties and the micro-ecological structure of the soil are effectively improved, and the soil quality is improved. The soil remediation method has the advantages of being easy and convenient to operate, lasting in remediation effect, free of secondary pollution and the like, and is suitable for improvement of soil polluted by multiple types of heavy metals.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of soil environment improvement, and particularly relates to a conditioner for improving soil environment. BACKGROUND

[0002] Part of the soil is also polluted by heavy metals, such as cadmium, lead, arsenic and the like, which are continuously accumulated in the soil. These heavy metal ions not only reduce the fertility and productivity of the soil, but also may enter the food chain through crops, thereby posing a potential threat to human health.

[0003] Nowadays, the treatment methods for heavy metal pollution mainly include the following: physical remediation method, which mainly removes or separates heavy metals in the soil by physical means. Common methods include guest soil method, soil replacement method, deep ploughing method, etc. The guest soil method is to dilute the concentration of heavy metals by adding uncontaminated soil. The soil replacement method is to directly replace the contaminated soil with clean soil. The deep ploughing method is to mix the surface contaminated soil with the deep uncontaminated soil by deep ploughing, so as to reduce the content of heavy metals in the surface soil. However, such methods often have large engineering quantity, high cost, and may damage the soil structure and ecological environment; chemical remediation method, which is to add chemical modifiers to the soil to change the existence form of heavy metals in the soil through adsorption, precipitation, complexation and other chemical reactions, so as to reduce the biological availability of heavy metals. Common chemical modifiers include lime, phosphate, clay minerals, etc. However, the chemical remediation method may change the pH value and other physical and chemical properties of the soil, and some modifiers may cause secondary pollution; biological remediation method, which utilizes the metabolic activities of biological organisms (such as plants, microorganisms, etc.) to reduce the toxicity or remove heavy metals in the soil. The plant remediation method is to screen and plant hyperaccumulators with strong heavy metal accumulation ability, so as to transfer heavy metals from the soil to the plant body through plant absorption, and then remove heavy metals by harvesting plants. The microbial remediation method utilizes the transformation and absorption of microorganisms to change the form of heavy metals or promote the dissolution and volatilization of heavy metals. The biological remediation method has the advantages of low cost, small environmental disturbance and strong sustainability, but the remediation period is relatively long and is greatly affected by environmental factors. Therefore, there is a need for a soil environment conditioner that can effectively reduce heavy metals in the soil and promote crop growth. SUMMARY

[0004] The present application provides a conditioner for improving soil environment to solve the defects in the prior art.

[0005] The present application is implemented by the following technical solutions: A conditioner for improving soil environment, comprising the following components in parts by weight: activated calcium silicate 6-8 parts, red mud 12-15 parts, selenocysteine 3-5 parts, compound decomposing bacterial agent 4-6 parts, boric acid 3-5 parts, ferrous sulfate 4-6 parts, amino-alginic acid 6-8 parts, potassium dihydrogen phosphate 15-20 parts, wood ash 6-10 parts, chitosan 3-5 parts.

[0006] The conditioner for improving soil environment as claimed in claim 1, wherein the activated calcium silicate is prepared by mixing silicon dioxide and calcium carbonate at a molar ratio of 1:1, calcining at a temperature of 1100-1200 DEG C under nitrogen protection for 1.5-1.8 h, and then continuing to calcine at a temperature of 1400-1500 DEG C under nitrogen protection for 2-2.2 h.

[0007] The conditioner for improving soil environment as claimed in claim 1, wherein the activated calcium silicate contains more than 70% of calcium silicate.

[0008] The conditioner for improving soil environment as claimed in claim 1, wherein the compound decomposing bacterial agent comprises the following components in parts by weight: Rhodococcus qingyongensis 6-8 parts, leaf-bacterial agent of Ardisia japonica 2-4 parts, yellow-producing Penicillium 4-6 parts, Pseudomonas 4-5 parts.

[0009] The conditioner for improving soil environment as claimed in claim 1, wherein the preparation method comprises the following steps: Step one: weighing the activated calcium silicate, red mud, selenocysteine, compound decomposing bacterial agent, boric acid, ferrous sulfate, amino-alginic acid, potassium dihydrogen phosphate, wood ash, and chitosan according to the ratio; Step two: mixing and crushing the weighed activated calcium silicate, red mud, selenocysteine, compound decomposing bacterial agent, boric acid, ferrous sulfate, amino-alginic acid, potassium dihydrogen phosphate, wood ash, and chitosan, and then reserving; Step three: mixing the mixture obtained in step two; Step four: feeding the mixed material in step three into a dry granulator to obtain conditioner granules for improving soil environment.

[0010] The conditioner for improving soil environment as claimed in claim 1, wherein the crushed material in step two is passed through a 100-mesh sieve, and if there is still remaining material on the sieve, the material is continuously crushed in a small crusher until it is completely sieved.

[0011] The conditioner for improving soil environment as claimed in claim 1, wherein the mixing and stirring speed in step three is 200-220 r / min, and the mixing and stirring time is 12-15 min.

[0012] The conditioner for improving soil environment as claimed in claim 1, wherein the particle size of the conditioner granules for improving soil environment obtained in step four is 2-4 mm.

[0013] The present application has the advantages of: The activated calcium silicate in the present application has a large specific surface area and abundant pore structure, can effectively capture heavy metal ions such as cadmium and lead in the soil through physical adsorption, and can further reduce the migration of heavy metals by forming stable silicate precipitates with part of the heavy metals through the contained silicate ions; The red mud in the present application is an industrial waste residue, which is not only widely available and low in cost, but also rich in metal oxides such as iron and aluminum, and can enhance the fixation effect on heavy metals through ion exchange and surface complexation, realizing the resource utilization of waste; The selenocysteine in the present application not only provides nutrition for soil microorganisms, but also forms non-toxic or low-toxic complexes with heavy metals, reducing the toxicity of heavy metals to soil organisms, while promoting the absorption of selenium by plants and improving the quality of agricultural products; The complex decomposing bacteria agent in the present application uses Rhodococcus qingshengii, Ardisia japonica leaf rod bacteria, Penicillium chrysogenum and Pseudomonas for compounding, Rhodococcus qingshengii can convert organic heavy metals in the soil into inorganic state through its own metabolism, improve the bioavailability of heavy metals, and facilitate subsequent fixation or absorption, and can also reduce the pH value of the soil by secreting organic acids and other substances, promote the dissolution of heavy metals, and its cell wall has strong adsorption capacity and can directly bind heavy metal ions; Penicillium chrysogenum can produce antibiotics such as penicillin to inhibit the reproduction of harmful microorganisms in the soil, improve the soil micro-ecological environment, and its mycelium can also fix heavy metals through physical winding and chemical adsorption; Pseudomonas has strong oxidation and reduction capacity, which can reduce high-valence heavy metal ions to low-valence state, reduce their toxicity, and also can secrete extracellular polymers to enhance the complexing effect on heavy metals, and the synergistic effect of the four can significantly improve the comprehensive treatment capacity of various heavy metals in the soil, and effectively improve the microbial community structure of the soil; Boric acid in the present application mainly plays a role in adjusting the pH value of the soil and promoting nutrient absorption in the conditioner, it can neutralize the alkaline substances in the soil to avoid affecting the microbial activity and nutrient availability due to too high or too low pH value, and as a trace element essential for plant growth, it can participate in the process of photosynthesis and reproductive growth of crops, enhance the absorption and utilization efficiency of crops on nitrogen, phosphorus, potassium and other macronutrients, and thus improve the stress resistance and yield of crops; Ferrous sulfate in the present application can adjust the form of iron element in the soil through oxidation and reduction reaction, provide absorbable divalent iron ions for plants, and the hydrogen ions produced by its hydrolysis can reduce the pH value of the soil, promote the adsorption and precipitation of activated calcium silicate, red mud and other components on heavy metals, in addition, iron ions can also form stable compounds with anions such as phosphate to reduce the fixation of soil phosphorus and improve the utilization rate of phosphorus fertilizer; The aminoized alginic acid has good water solubility and biodegradability, and the functional groups such as amino and carboxyl on the molecular chain can occur chelation reaction with heavy metal ions to form stable chelates, prevent the migration of heavy metals to plant roots, and also improve the soil aggregate structure, enhance the soil water and fertilizer retention capacity, and provide a suitable microenvironment for the growth and reproduction of microorganisms; The potassium dihydrogen phosphate in the application is a high-efficiency phosphorus and potassium compound fertilizer, which can not only provide sufficient phosphorus and potassium elements for crop growth, promote crop root development and photosynthesis, but also combine with heavy metal ions in the soil to form insoluble phosphate precipitates, further cooperatively fix heavy metals, and reduce the biological availability of heavy metals; The wood ash in the application is rich in potassium salt and carbonate, and the carbonate ions contained therein can form carbonate precipitates with heavy metal ions, and the loose particle structure of the wood ash can increase the soil permeability, promote root respiration and microbial activity; The chitosan in the application is a natural high molecular compound, and the amino and hydroxyl groups contained in the molecule can combine heavy metal ions through electrostatic adsorption, hydrogen bonding and other modes to form stable complexes, and the chitosan has good antibacterial property, can inhibit the growth of pathogenic bacteria in the soil, and can also promote the reproduction of beneficial microorganisms such as actinomycetes in the soil, improve the ecological balance of the soil, and comprehensively improve the fertility and self-purification capacity of the soil; The application can efficiently fix and remove heavy metals in the soil from multiple dimensions through the synergistic effect of the raw materials, and can supplement the soil with rich nutrient elements and beneficial microorganisms, on the basis of reducing the biological availability of heavy metals and alleviating the harm of heavy metals to the ecological environment, effectively improve the physicochemical properties and microecological structure of the soil, and improve the soil fertility and the nutrient supply capacity required for crop growth, which can achieve the dual goals of soil environment remediation and agricultural production capacity improvement, has the advantages of simple operation, durable remediation effect and no secondary pollution, and is suitable for the improvement of multiple types of heavy metal contaminated soil. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, a brief introduction will be given below to the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0015] Figure 1 is a columnar schematic diagram of heavy metal treatment efficiency verification of the verification test of the present application; Figure 2 is a columnar schematic diagram of heavy metal content in wheat grains in the planting test of the verification test of the present application. DETAILED DESCRIPTION

[0016] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0017] Embodiment 1 Step one: according to the proportion, take activated calcium silicate 6 parts, red mud 12 parts, selenocysteine 3 parts, compound decomposition bacterial agent (the weight parts of the component bacterial species are: Fan Qingsheng's Rhodococcus 6 parts, Ardisia japonica leaf bacterial 2 parts, yellow-green penicillium 4 parts, Pseudomonas 4 parts) 4 parts, boric acid 3 parts, ferrous sulfate 4 parts, amino sea alginic acid 6 parts, potassium dihydrogen phosphate 15 parts, wood ash 6 parts, chitosan 3 parts; Step two: mix and crush the weighed activated calcium silicate, red mud, selenocysteine, compound decomposition bacterial agent, boric acid, ferrous sulfate, amino sea alginic acid, potassium dihydrogen phosphate, wood ash and chitosan through a 100-mesh sieve, and continue to transfer the remaining substances on the sieve into a small crusher for further crushing until all the materials are sieved and reserved; Step three: mix the mixture obtained in step two, and the mixing and stirring speed is 200 r / min, and the mixing and stirring time is 15 min; Step four: send the mixed material in step three into a dry granulator to obtain conditioner particles for improving soil environment, and the particle size is 2-2.5 mm.

[0018] Embodiment 2 Step one: according to the proportion, take activated calcium silicate 8 parts, red mud 15 parts, selenocysteine 5 parts, compound decomposition bacterial agent (the weight parts of the component bacterial species are: Fan Qingsheng's Rhodococcus 8 parts, Ardisia japonica leaf bacterial 4 parts, yellow-green penicillium 6 parts, Pseudomonas 5 parts) 6 parts, boric acid 5 parts, ferrous sulfate 6 parts, amino sea alginic acid 8 parts, potassium dihydrogen phosphate 20 parts, wood ash 10 parts, chitosan 5 parts; Step two: mix and crush the weighed activated calcium silicate, red mud, selenocysteine, compound decomposition bacterial agent, boric acid, ferrous sulfate, amino sea alginic acid, potassium dihydrogen phosphate, wood ash and chitosan through a 100-mesh sieve, and continue to transfer the remaining substances on the sieve into a small crusher for further crushing until all the materials are sieved and reserved; Step three: mix the mixture obtained in step two, and the mixing and stirring speed is 220 r / min, and the mixing and stirring time is 12 min; Step four: send the mixed material in step three into a dry granulator to obtain conditioner particles for improving soil environment, and the particle size is 3-3.5 mm.

[0019] Example 3 Step one: according to the proportion of activated calcium silicate 7 parts, red mud 14 parts, seleno cysteine 4 parts, complex decomposition of bacteria agent (the weight parts of its composition bacteria are: fang qing sheng rhodococcus 7 parts, ardisia japonica leaf rod bacteria 3 parts, yellow-green penicillium bacteria 5 parts, pseudomonas 4.5 parts) 5 parts, boric acid 7 parts, ferrous sulfate 5 parts, amino sea alginic acid 7 parts, potassium dihydrogen phosphate 18 parts, wood ash 8 parts, chitosan 4 parts; Step two: the mixed material obtained in step two is mixed, the mixing stirring speed is 210 r / min, and the mixing stirring time is 14 min; Step three: the mixed material obtained in step two is mixed, the mixing stirring speed is 210 r / min, and the mixing stirring time is 14 min; Step four: the mixed material obtained in step three is sent into a dry granulator to obtain the conditioner granules for improving soil environment, and the particle size is 2.5-3 mm.

[0020] Comparative example 1 Step one: according to the proportion of activated calcium silicate 6 parts, red mud 12 parts, seleno cysteine 3 parts, 4 parts, boric acid 3 parts, ferrous sulfate 4 parts, amino sea alginic acid 6 parts, potassium dihydrogen phosphate 15 parts, wood ash 6 parts, chitosan 3 parts; Step two: the mixed material obtained in step two is mixed, the mixing stirring speed is 210 r / min, and the mixing stirring time is 14 min; Step three: the mixed material obtained in step two is mixed, the mixing stirring speed is 210 r / min, and the mixing stirring time is 14 min; Step four: the mixed material obtained in step three is sent into a dry granulator to obtain the conditioner granules for improving soil environment, and the particle size is 2-2.5 mm.

[0021] Comparative example 2 Step one: according to the proportion of activated calcium silicate 6 parts, red mud 12 parts, seleno cysteine 3 parts, 4 parts, boric acid 3 parts, ferrous sulfate 4 parts, amino sea alginic acid 6 parts, potassium dihydrogen phosphate 15 parts, wood ash 6 parts, chitosan 3 parts; Step two: the mixed material obtained in step two is mixed, the mixing stirring speed is 210 r / min, and the mixing stirring time is 14 min; Step 3: Mix the mixture obtained in Step 2 at a speed of 220 r / min for 12 min. Step 4: Feed the mixed material from Step 3 into a dry granulator to obtain soil conditioner granules with a particle size of 3-3.5mm.

[0022] Comparative Example 3 Step 1: Weigh out 7 parts of activated calcium silicate, 5 parts of compound decomposing bacteria (the weight parts of the bacterial species are: 7 parts of Rhodococcus faecalis, 3 parts of Botrytis cinerea, 5 parts of Penicillium chrysogenum, and 4.5 parts of Pseudomonas aeruginosa), 5 parts of ferrous sulfate, 18 parts of potassium dihydrogen phosphate, 8 parts of wood ash, and 4 parts of chitosan according to the formula. Step 2: Mix and pulverize the weighed activated calcium silicate, compound decomposing bacteria agent, ferrous sulfate, potassium dihydrogen phosphate, wood ash, and chitosan through a 100-mesh sieve. If there is still residue on the sieve, continue to pulverize it in a small pulverizer until all the residue passes through the sieve and set it aside for later use. Step 3: Mix the mixture obtained in Step 2 at a speed of 210 r / min for 14 min. Step 4: Feed the mixed material from Step 3 into a dry granulator to obtain soil conditioner granules with a particle size of 2.5-3mm.

[0023] Verification test Heavy metal treatment efficiency verification To prepare heavy metal contaminated soil, soil samples were taken, and the pH was measured to be 6.7. Seven soil samples (1 kg each) were placed in beakers and named as Examples 1-3, Comparative Examples 1-3, and a control group. Cadmium nitrate solution, lead nitrate solution, sodium arsenite solution, and mercuric chloride solution were added to the seven soil samples according to the following standards: 50 mg / kg cadmium ion, 100 mg / kg lead ion, 50 mg / kg arsenic ion, and 50 mg / kg mercury ion. The mixtures were thoroughly stirred and mixed. After standing for 24 hours to allow heavy metal ions to distribute evenly in the soil, simulated heavy metal contaminated soil samples were prepared. Then, 50g each of the conditioners prepared in Examples 1-3 and Comparative Examples 1-3 were weighed and dissolved in 500ml of water respectively. These were then evenly poured into beakers containing the corresponding soil groups. For the blank group, 550ml of water was added. After thorough mixing, the treated soil samples were placed in a constant temperature incubator at 25℃ and 60% humidity for 30 days, with water added periodically to maintain constant humidity. After the incubation period, the heavy metal ion content in the seven soil groups was detected, and the corresponding heavy metal ion removal rates were calculated. The results are shown in Table 1, and the bar chart is shown below. Figure 1 As shown.

[0024] From the data in Table One and Figure 1 It can be seen that the removal efficiency of heavy metal ions by the soil environment improvement conditioner particles prepared in Examples 1-3 is obviously superior to that of Comparative Examples 1-3 and the blank example, which proves that the soil environment improvement conditioner particles prepared in the application can efficiently remove or fix free metal ions in the soil.

[0025] Planting test A farmland in Linyi, Shandong, which has been confirmed to be slightly polluted by heavy metals (the concentration of cadmium ions is 12.3 mg / kg, the addition amount of lead ions is 89.3 mg / kg, the addition amount of arsenic ions is 47.6 mg / kg, and no mercury ions are detected) is selected as the test field. Seven fields with similar heavy metal ion content are selected as test fields and named as Example 1-3 group, Comparative Example 1-3 group and blank group in turn. The soil environment improvement conditioner particles prepared in Examples 1-3 and Comparative Examples 1-3 are mixed with water in a mass ratio of 1:10 and sprayed in the corresponding test fields in an addition amount of 10 kg / mu. The blank group is sprayed with the same amount of water. After spraying, it is left for 30 days, and then the same weight and variety of wheat seeds (variety: Jimai 22) are planted in each test field. The irrigation and fertilization operations in the subsequent planting operations are the same for the seven test groups. After 200 days of planting, the yield per mu, the average plant height of wheat, the average root depth of wheat, and the average weight of 100 wheat kernels of each test field are counted, and the results are shown in Table Two. The heavy metal content in the wheat kernels is detected, and the results are shown in Table Three, and the column chart is shown in Figure 2 .

[0026] From the data in Table Two, the yield per mu, the average plant height of wheat, the average root depth of wheat, and the average weight of 100 wheat kernels of the soil environment improvement conditioner particles prepared in Examples 1-3 are better than those of Comparative Examples 1-3 and the blank example after the planting test. Therefore, the soil environment improvement conditioner particles prepared in the application can effectively promote the growth of crops and increase the yield. From the data in Table Three and Figure 2It can be known that the heavy metal detection results of the improved soil environment conditioner particles prepared in the embodiments 1-3 in the planting test meet the national standards (the over-standard standard of the heavy metal content in the wheat grains is from the Food Safety National Standard-Pollutant Limit in Food (GB 2762-2012), and the specific limit is as follows: the limit value of cadmium (Cd) is 0.1 mg / kg, the limit value of lead (Pb) is 0.2 mg / kg, and the limit value of arsenic (As) is 0.1 mg / kg), while the heavy metal ion content of the wheat grains planted by the comparative example 1, the comparative example 2 and the blank group all exceeds the standard, and although the comparative example 3 only has the lead ion content exceeding the standard, the cadmium ion content and the arsenic ion content thereof are also several times of those of the embodiments 1-3, so that the improved soil environment conditioner particles prepared in the application can improve the soil environment and improve the crop yield, realize the dual goals of soil environment remediation and agricultural production capacity improvement, and are convenient to use in the soil polluted by the heavy metal ions subsequently.

[0027] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, but not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. A soil conditioner for improving the soil environment, characterized in that: The product contains the following components in parts by weight: 6-8 parts activated calcium silicate, 12-15 parts red mud, 3-5 parts selenocysteine, 4-6 parts compound decomposing bacteria agent, 3-5 parts boric acid, 4-6 parts ferrous sulfate, 6-8 parts aminated alginic acid, 15-20 parts potassium dihydrogen phosphate, 6-10 parts wood ash, and 3-5 parts chitosan.

2. The soil conditioner for improving the soil environment according to claim 1, characterized in that: The method for preparing activated calcium silicate is as follows: silicon dioxide and calcium carbonate are mixed in a molar ratio of 1:1 and calcined at a temperature of 1100-1200℃ under nitrogen protection for 1.5-1.8h. Then, the temperature is raised to 1400-1500℃ and calcined again under nitrogen protection for 2-2.2h to obtain activated calcium silicate.

3. The soil conditioner for improving the soil environment according to claim 2, characterized in that: The activated calcium silicate contains more than 70% calcium silicate.

4. The soil conditioner for improving the soil environment according to claim 1, characterized in that: The compound decomposing bacterial agent comprises the following substances in parts by weight: 6-8 parts of Rhodococcus faecalis, 2-4 parts of Botrytis cinerea, 4-6 parts of Penicillium chrysogenum, and 4-5 parts of Pseudomonas aeruginosa.

5. A soil conditioner for improving the soil environment according to claim 1, characterized in that: Its preparation method includes the following steps: Step 1: Weigh out the following ingredients according to the specified ratio: activated calcium silicate, red mud, selenocysteine, compound decomposing bacteria, boric acid, ferrous sulfate, amino-modified alginic acid, potassium dihydrogen phosphate, wood ash, and chitosan. Step 2: Mix and pulverize the weighed activated calcium silicate, red mud, selenocysteine, compound decomposing bacteria agent, boric acid, ferrous sulfate, amino-modified alginic acid, potassium dihydrogen phosphate, wood ash, and chitosan for later use. Step 3: Mix the mixture obtained in Step 2; Step 4: Feed the mixed material from Step 3 into a dry granulator to obtain soil conditioner granules for improving the soil environment.

6. A soil conditioner for improving the soil environment according to claim 5, characterized in that: In step two, after crushing, the material is passed through a 100-mesh sieve. If there is still material remaining on the sieve, it is transferred to a small crusher for further crushing until all the material passes through the sieve.

7. A soil conditioner for improving the soil environment according to claim 5, characterized in that: The mixing speed in step three is 200-220 r / min, and the mixing time is 12-15 min.

8. A soil conditioner for improving the soil environment according to claim 5, characterized in that: The soil conditioner particles obtained in step four have a particle size of 2-4 mm.

Images