Composite biological soil conditioner, and preparation method and application thereof
A technology of biological soil improvement and soil improver, which is applied in the field of soil environmental management to achieve the effects of alleviating high pH value, improving adsorption capacity, and low cost
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[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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