Soil conditioner

Abstract

A soil conditioner belongs to the technical field of soil improvement, and comprises, by mass, 8-12 parts of chitosan oligosaccharide, 2-3 parts of cellulose oligosaccharide, 5-10 parts of alginate oligosaccharide, 2-6 parts of licorice oligosaccharide, 30-40 parts of humic acid, 5-8 parts of a microbial agent, 10-20 parts of minerals, and 5-10 parts of manganese oxide modified charcoal. According to the invention, oligosaccharide is used as an inducer, humic acid is used for constructing a soil skeleton, microorganisms are used for realizing nutrient circulation, and mineral substances and manganese oxide modified charcoal are used for providing long-acting support, so that biostimulation is used as a guide, the soil structure is adjusted, microbial flora is improved, and the crop yield is increased; the heavy metal polluted soil condition is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of soil improvement and relates to a soil improver. Background Art

[0002] Soil is a finite resource essential to human survival. Due to various natural and human influences, soil compaction, desertification, salinization, poor drainage and aeration, low water and fertilizer retention, erosion, excessive or insufficient water permeability, high sodium exchange rates, and infertility are becoming increasingly common. These conditions lead to soil degradation, weakened resilience of soil and crops to disaster risks, and low agricultural production yields. Soil amendment is a common method to improve soil condition.

[0003] Soil improvers, also known as soil conditioners, can improve soil physical properties and promote crop nutrient absorption. They are a common means of improving soil conditions.

[0004] Invention patent application number CN202210163552.9, titled "A Tea Garden Acidic Soil Conditioner and Improvement Process," discloses the use of "dolomite powder, modified biochar, humic acid, earthworm castings, organic fertilizer, composite bacterial agents, nitrification inhibitors, and lignin superabsorbent resin" to improve soil fertility, address insufficient soil water retention, inhibit the decrease in soil base saturation, and alleviate soil acidification. While this patent application can address soil acidification, its effectiveness needs to be improved.

[0005] Invention patent application number CN202110709935.7, "A Saline-Alkali Soil Conditioner," discloses the use of "biological activated carbon, humic acid, organic base material, diatomaceous earth, activated acid, and microbial flora." These ingredients work together to effectively regulate soil physical and chemical properties and improve and enhance the soil's biological microenvironment. While this patent application addresses the microenvironmental issues in saline-alkali soil, its effectiveness needs to be improved.

[0006] Traditional Chinese medicine residues or plant waste contain organic matter and trace elements such as cellulose, hemicellulose, lignin, polysaccharides, proteins, etc., so traditional Chinese medicine residues or plant waste can be used as materials for soil improvement. However, at present, traditional Chinese medicine residues or plant waste are mainly used to improve soil by composting, fermentation, biochar, etc., and the effect is average. More complete and more effective methods should be developed to prepare them as soil conditioners. Summary of the Invention

[0007] The present invention aims to provide a soil conditioner that can increase the bulk density of soil, improve the heavy metal pollution of soil, and increase the yield of crops.

[0008] The present invention adopts the following technical solutions to achieve its purpose:

[0009] A soil conditioner comprises, by weight, 8-12 parts of chitosan oligosaccharide, 2-3 parts of cellulose oligosaccharide, 5-10 parts of brown algae oligosaccharide, 2-6 parts of licorice oligosaccharide, 30-40 parts of humic acid, 5-8 parts of microbial agent, 10-20 parts of minerals, and 5-10 parts of manganese oxide modified biochar.

[0010] Preferably, the manganese oxide modified biochar is prepared by the following method:

[0011] The plant straw is pyrolyzed at 500-800°C to obtain biochar, which is then impregnated into a manganese salt solution. The impregnated biochar is dried and then calcined at 300-500°C under nitrogen protection to obtain manganese oxide-modified biochar.

[0012] Preferably, the manganese salt solution is a manganese chloride solution or a manganese nitrate solution, and the concentration of the manganese salt solution is 0.5-0.8 mol / L.

[0013] Preferably, the soaking time is 12-24 hours.

[0014] Preferably, the drying is carried out at 60-90°C.

[0015] Preferably, the calcination time is 1-2 hours.

[0016] Preferably, the microbial agent comprises one or any combination of Lactobacillus plantarum, Halomonas, Bacillus subtilis, Trichoderma harzianum, and arbuscular mycorrhizal fungi.

[0017] Preferably, the mineral material comprises one or any combination of diatomaceous earth, zeolite and bentonite.

[0018] The beneficial effects of the present invention are:

[0019] The present invention uses oligosaccharides as inducers, adopts humic acid to construct the soil skeleton, utilizes microorganisms to realize nutrient circulation, and provides long-term support through the modification of biochar by minerals and manganese oxides, thereby realizing biological stimulation as the guide, and then adjusting the soil structure, improving the microbial flora, thereby increasing crop yields and improving the heavy metal contaminated soil.

[0020] The improver system of the present invention can rapidly improve the ecological environment of beneficial bacteria in the soil, activating and promoting the healthy growth of beneficial soil bacteria, improving the microecological environment of the planting soil, and causing them to secrete beneficial substances that are beneficial to plant growth. For example, it can rapidly promote the growth of photosynthetic bacteria in the soil, thereby separating hydrogen sulfide and hydrogen from hydrocarbons in the soil, rendering harmful substances harmless.

[0021] Chitosan in the present invention can promote the development of crop roots and the absorption of nutrients by the roots, playing a role in promoting growth and resisting stress; brown algae oligosaccharides can improve the tolerance of crops; cellulose oligosaccharides act on plant roots and improve the soil microenvironment; licorice oligosaccharides have a broad-spectrum antibacterial effect, which can inhibit soil-borne pathogenic fungi (such as Fusarium and Rhizoctonia), reduce crop diseases, and its sticky components can also improve the soil aggregate structure; and licorice resources are abundant, and licorice oligosaccharides can be extracted from the residue after glycyrrhizic acid extraction for a second time, realizing waste recycling at extremely low cost. Humic acid can improve the air permeability and water permeability of the soil; microbial agents can improve nutrient conversion and enhance disease antagonism; mineral and manganese oxide modified biochar provide the mineral elements needed by crops on the one hand, and work together with other components to repair heavy metal soil pollution on the other hand. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0023] Example 1

[0024] Preparation of manganese oxide modified biochar:

[0025] Corn straw was pyrolyzed at 700°C to obtain biochar, which was then impregnated in a 0.6 mol / L manganese chloride solution for 20 h. The impregnated biochar was dried at 80°C and then calcined at 400°C under nitrogen for 1.5 h to obtain manganese oxide-modified biochar for use in the following examples.

[0026] Example 2

[0027] A soil conditioner comprises, by mass, 12 parts of chitosan oligosaccharide, 3 parts of cellulose oligosaccharide, 6 parts of brown algae oligosaccharide, 2 parts of glycyrrhizic oligosaccharide, 35 parts of humic acid, 7 parts of microbial agent (Bacillus subtilis: Trichoderma harzianum: arbuscular mycorrhizal fungi = 4:2:1), 15 parts of zeolite, and 8 parts of manganese oxide-modified biochar.

[0028] Example 3

[0029] A soil conditioner comprises, by mass, 9 parts of chitosan oligosaccharide, 3 parts of cellulose oligosaccharide, 8 parts of brown algae oligosaccharide, 6 parts of glycyrrhizic oligosaccharide, 32 parts of humic acid, 6 parts of microbial agent (Bacillus subtilis: Trichoderma harzianum: arbuscular mycorrhizal fungi=1:1:1), 9 parts of zeolite, 9 parts of diatomaceous earth, and 6 parts of manganese oxide-modified biochar.

[0030] Example 4

[0031] A soil conditioner comprises, by mass, 10 parts of chitosan oligosaccharide, 2 parts of cellulose oligosaccharide, 7 parts of brown algae oligosaccharide, 4 parts of glycyrrhizic oligosaccharide, 38 parts of humic acid, 8 parts of microbial agent (Lactobacillus plantarum: Bacillus subtilis: Trichoderma harzianum: arbuscular mycorrhizal fungi = 1:1:1:1), 5 parts of bentonite, 8 parts of diatomaceous earth, and 7 parts of manganese oxide-modified biochar.

[0032] Example 5

[0033] A soil conditioner comprises, by mass, 8 parts of chitosan oligosaccharide, 2 parts of cellulose oligosaccharide, 10 parts of brown algae oligosaccharide, 5 parts of glycyrrhizic acid oligosaccharide, 40 parts of humic acid, 5 parts of microbial agent (Lactobacillus plantarum: Halomonas: Bacillus subtilis: Trichoderma harzianum: arbuscular mycorrhizal fungi = 1:1:1:1:1), 10 parts of bentonite, and 10 parts of manganese oxide-modified biochar.

[0034] Comparative Example 1

[0035] A soil conditioner comprises, by mass, 12 parts of chitosan oligosaccharide, 3 parts of cellulose oligosaccharide, 6 parts of brown algae oligosaccharide, 2 parts of glycyrrhizic oligosaccharide, 35 parts of humic acid, 7 parts of microbial agent (Bacillus subtilis: Trichoderma harzianum: arbuscular mycorrhizal fungi=4:2:1), 15 parts of zeolite, and 8 parts of biochar.

[0036] Comparative Example 2

[0037] A soil conditioner comprises, by mass, 12 parts of chitosan oligosaccharide, 3 parts of cellulose oligosaccharide, 6 parts of brown algae oligosaccharide, 35 parts of humic acid, 7 parts of microbial agent (Bacillus subtilis: Trichoderma harzianum: arbuscular mycorrhizal fungi=4:2:1), 15 parts of zeolite, and 8 parts of biochar.

[0038] Test Example 1

[0039] 1. Experimental Soil Preparation: Take 140 kg of soil from the same plot, dry it in the sun, and add wood ash, organic humus, and chemical fertilizer. Mix thoroughly, then place 20 kg of the soil in a test chamber as a blank control. Add 10.5 g each of lead slag, arsenic slag, chromium slag, and cadmium slag to the remaining 120 kg of soil. Mix thoroughly, soak it with water, and let it sit for 90 days to simulate heavy metal contaminated soil. During storage, perform anti-seepage treatment on the outside of the soil pile to prevent environmental contamination. Then, divide the soil into six equal portions and place them in the test chamber, numbering them 1-6.

[0040] 2. Add 1% by weight of the soil conditioner of Example 2, Example 3, Example 4, Example 5, Comparative Example 1, and Comparative Example 2 to each of the test boxes 1-6. Place the test boxes in a greenhouse, ensure that the soil in each box is under the same conditions, and water thoroughly for later use.

[0041] 3. Sow 10 soybeans in each test box. After they germinate and grow, thin them out at the same time. Keep the two best-growing soybean seedlings in each test box and carry out conventional field management.

[0042] 4. Record soybean growth, weigh the pots (including the total weight of the plant, water, and pot), and soil properties. Record the yield of each pot at harvest time and test the soybeans for heavy metal content. See Table 1 for the results.

[0043] Table 1

[0044]

[0045] As can be seen from Table 1, the soil conditioner of the present invention can improve the structure of the soil and increase the bulk density of the soil. It can not only repair and improve the soil contaminated by heavy metals, but also increase the yield of crops.

[0046] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the above-mentioned embodiments, ordinary technicians in this field should understand that any technician familiar with this technical field can still modify the technical solutions recorded in the above-mentioned embodiments within the technical scope disclosed by the present invention, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered by the protection scope of the present invention.

Claims

1. A soil conditioner, characterized in that Calculated by mass, the composition comprises 8-12 parts of chitosan oligosaccharide, 2-3 parts of cellulose oligosaccharide, 5-10 parts of brown algae oligosaccharide, 2-6 parts of licorice oligosaccharide, 30-40 parts of humic acid, 5-8 parts of microbial agent, 10-20 parts of minerals, and 5-10 parts of manganese oxide modified biochar.

2. A soil conditioner according to claim 1, characterized in that The manganese oxide modified biochar is prepared by the following method: The plant straw is pyrolyzed at 500-800°C to obtain biochar, which is then impregnated into a manganese salt solution. The impregnated biochar is dried and then calcined at 300-500°C under nitrogen protection to obtain manganese oxide-modified biochar.

3. A soil conditioner according to claim 2, characterized in that The manganese salt solution is a manganese chloride solution or a manganese nitrate solution, and the concentration of the manganese salt solution is 0.5-0.8 mol / L.

4. A soil conditioner according to claim 2, characterized in that The soaking time is 12-24 hours.

5. A soil conditioner according to claim 2, characterized in that: When drying, dry at 60-90℃.

6. A soil conditioner according to claim 2, characterized in that: The calcination time is 1-2h.

7. A soil conditioner according to claim 1, characterized in that: The microbial agent comprises one or any combination of Lactobacillus plantarum, Halomonas, Bacillus subtilis, Trichoderma harzianum and arbuscular mycorrhizal fungi.

8. A soil conditioner according to claim 1, characterized in that: The minerals include one or any combination of diatomaceous earth, zeolite and bentonite.

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