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Composite biological soil conditioner and its preparation method and application

A technology of biological soil improvement and soil improver, which is applied in the field of soil environment management to reduce the salinity of surface soil, improve salt tolerance, and improve saline-alkali soil

Active Publication Date: 2022-04-12
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned published patents ignore the antagonism between bacterial fertilizer microorganisms and indigenous microorganisms and the problem that biochar itself is alkaline and its application in saline-alkali soil is limited.

Method used

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  • Composite biological soil conditioner and its preparation method and application
  • Composite biological soil conditioner and its preparation method and application
  • Composite biological soil conditioner and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] In an optional embodiment, the preparation method of modified biochar comprises the following steps:

[0036] (1) Preparation of raw biochar: air-dried algae biomass is pulverized and ground, passed through a 1-5mm sieve to obtain biomass powder, put the biomass powder into a crucible, compact and cover it, place it in a muffle furnace, and 3-5℃·min -1 Raise the rate to 300-500°C, keep it for 1-3 hours, take it out after natural cooling, and crush it through a 50-100 mesh sieve;

[0037](2) Modification of the original biochar: get 25-35 mass parts of the original biochar in the conical flask, add 2-8mL of the original biochar according to the ratio of 5-15% H 3 PO 4 Solution, stir with a magnetic stirrer at room temperature for 8-16h, the speed is 110-140r min -1 , the modified biochar was repeatedly soaked in distilled water for 13-48 hours, then filtered and cleaned until the pH value of the washing liquid was stable, and dried at 50-80°C to constant weight to obt...

Embodiment 1

[0051] Saline-alkali soil selection

[0052] The coastal tidal flat saline soil located in the Yellow River Delta area, Dongying City, Shandong Province is selected. The salinity is 2.0‰, the pH value is 7.90, the salt composition is mainly sodium chloride, and the bulk density is 1.42g / cm 3 , available potassium is 164.80mg / kg, and organic carbon is 0.92%.

[0053] Preparation of compound biological soil conditioner

[0054] Preparation of raw biochar:

[0055] Enteromorpha biomass was air-dried, pulverized, ground, passed through a 2mm sieve to obtain Enteromorpha powder, put Enteromorpha powder into a crucible, compacted and covered, placed in a muffle furnace, heated at 4°C min -1 Raise the rate to 400°C, keep it for 2 hours, take it out after natural cooling, and crush it through a 60-mesh sieve to obtain the original biochar.

[0056] Preparation of modified biochar:

[0057] Take 30.0 g of prepared raw biochar in a conical flask, add 100 mL of 10% H 3 PO 4 (v / v) s...

Embodiment 2

[0074] The difference from Example 1 is: the soil belongs to the mild-to-moderate coastal tidal flat saline soil with a salinity of 3.8‰, the pH value is 7.92, and the bulk density is 1.42g / cm 3 , the available potassium is 162.10 mg / kg, and the organic carbon is 0.82%; biochar and arbuscular mycorrhizal fungus compound biological soil amendment are applied according to 3% of the soil weight.

[0075]Compared with the control, the pH value decreased by 0%, 8.08%, and 8.08% when the bacterial fertilizer, modified biochar, and compound biological soil amendment were added alone; the bulk density decreased by 0%, 23.02%, and 23.30%; the available potassium increased respectively. 8.08%, 13.63%, 16.96%, the compound biological soil amendment increased the organic carbon by 263.41%, the plant height increased by 36.84%, and the fresh weight increased most obviously, which was 166.49%. The root activity in the plant physiological indicators increased by 120.83%, 146.50 %, 306.51%, t...

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Abstract

The invention proposes a compound biological soil improver and its preparation method and application, which belongs to the field of biotechnology and can solve the problems that the alkaline nature of biochar itself is limited in the improvement of saline-alkali soil and the relationship between bacterial manure and bacterial fertilizer is neglected in the preparation of compound improvers. There are problems such as antagonism between indigenous microorganisms. The technical scheme comprises a compound biological soil improver, which comprises 70-80 parts of modified biochar and 20-30 parts of arbuscular mycorrhizal fungus fertilizer in parts by weight; the compound biological soil improver is prepared by improving It is prepared through the steps of permanent biochar, preparation of arbuscular mycorrhizal fungus fertilizer and mixing, and is used for the improvement of mild and moderate saline-alkali land. In the present invention, the modified biochar and the arbuscular mycorrhizal fungal fertilizer have a synergistic effect, and the biochar can directly improve the physical and chemical properties of the saline-alkali soil, reduce the salinity of the surface soil, and at the same time, provide a source of nutrition and a refuge for microorganisms, ensuring The microbial survival rate in the arbuscular mycorrhizal fungus fertilizer, and then use the bacterial fertilizer to improve the salt tolerance of plants, promote plant growth, and improve saline-alkali soil.

Description

technical field [0001] The invention relates to the field of soil environment treatment, in particular to a compound biological soil improver and its preparation method and application. Background technique [0002] Na in coastal saline soil + High ion content, high pH value, and low nutrients lead to few types and quantities of vegetation in saline-alkali soil areas, poor microbial diversity, and difficult agricultural utilization. With the increasing scarcity of land resources in our country, it is of great significance to improve the saline-alkali soil in coastal areas. [0003] In recent years, biochar and bio-bacterial fertilizer have been widely used in saline-alkali soil improvement. For example, "Enteromorpha biochar effects on coastal saline-alkaline soil Na + Research on the Adsorption and Migration Mechanism of Enteromorpha biochar by changing the Na in saline-alkali soil + distribution, and then provide a good root zone environment for plants; CN107493896A di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05F11/08C05G3/80C01B32/05A01B79/02
CPCC05D9/00C05F11/08A01B79/02C01B32/05Y02A40/10
Inventor 孙萍郭嘉梦陈友媛王翔宇李养沛刘明李晓晨
Owner OCEAN UNIV OF CHINA
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