A kind of acidic soil conditioner and its preparation method and application

A technology of acidic soil and improver, applied in the field of agricultural environmental science, can solve the problems of unreachable and limited soil pH capacity, and achieve the effect of easy operation, simple preparation method and good effect

Active Publication Date: 2020-05-05
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional biochar preparation, the biochar itself will have a small amount of alkaline groups to increase the pH of the acidic soil, but the ability to increase the soil pH is limited, and the addition of biochar to the soil will take place over time, and the pH will slow down. Slow and acidification, can not achieve long-term improvement

Method used

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  • A kind of acidic soil conditioner and its preparation method and application
  • A kind of acidic soil conditioner and its preparation method and application
  • A kind of acidic soil conditioner and its preparation method and application

Examples

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Effect test

Embodiment 1

[0032] The preparation method of the acid soil conditioner of the present embodiment may further comprise the steps:

[0033] (1) Preparation of biochar: take rice straw, crush it to 5mm, and place it at 400°C under N 2 Cracking under protection for 3 hours; raise the temperature to 700°C, the heating rate is 10°C / min, and continuously feed ammonia gas at a flow rate of 200ml / min under the pressure of 0.1-0.3MPa, after activation for 2 hours, cool through a 5mm sieve, that is get biochar;

[0034] (2) Mixing: Mix the biochar prepared in step (1) with the purchased peat and calcium-magnesium phosphate fertilizer in a mass ratio of 5:4:1 to obtain an acidic soil conditioner.

Embodiment 2

[0038] The preparation method of the acid soil conditioner of the present embodiment may further comprise the steps:

[0039] (1) Preparation of biochar: Take corn stalks, crush them to 3mm, and place them at 300°C under N 2 Cracking under protection for 2 hours; raise the temperature to 600°C, the heating rate is 5°C / min, and continuously feed ammonia gas at a flow rate of 500ml / min under the pressure of 0.1-0.3MPa, activate for 1h, and cool through a 2mm sieve to obtain bio-charcoal;

[0040] (2) Mixing: Mix the biochar prepared in step (1) with the purchased peat and calcium magnesium phosphate fertilizer in a mass ratio of 6:2:2 to obtain an acidic soil conditioner.

Embodiment 3

[0044] The preparation method of the acid soil conditioner of the present embodiment may further comprise the steps:

[0045] (1) Preparation of biochar: Take wheat straw, crush it to 8mm, and place it at 500°C under N 2 Cracking under protection for 4 hours; increase the temperature to 800°C, the heating rate is 15°C / min, and continuously feed ammonia gas at a flow rate of 600ml / min under the pressure of 0.1-0.3MPa, activate for 3 hours, cool through a 1mm sieve, and get bio-charcoal;

[0046] (2) Mixing: mix the biochar prepared in step (1) with peat and calcium magnesium phosphate fertilizer in a mass ratio of 5:3:2 to obtain an acidic soil conditioner.

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Abstract

The invention discloses an acidic soil conditioner which is composed of biochar, peat and calcium-magnesium-phosphate fertilizer, wherein the mass ratio of the biochar, the peat and the calcium-magnesium-phosphate fertilizer is 5 to 7:2 to 4:1 to 2. A preparation method of the acidic soil conditioner comprises the following steps: (1) preparation of biochar: taking straws and conducting crushing and splitting; and heating products obtained by splitting, activating the products obtained by splitting by introducing ammonia gas, and then conducting cooling and sieving to obtain the biochar; and (2) mixing: mixing the biochar obtained by the step (1) with the peat, and the calcium-magnesium-phosphate fertilizer according to a formula to obtain the acidic soil conditioner. By improving basic groups of biochar, the ability of neutralization of soil pH of the acidic soil conditioner is improved; and by adding the peat containing humic acid to buffer the pH and by adding the calcium-magnesium-phosphate fertilizer, the decrease changing of soil pH is prevented and soil trace elements are enriched at the same time. The acidic soil conditioner is beneficial to comprehensive soil improvement and crop yield increase.

Description

technical field [0001] The invention belongs to agricultural environment science and technology, and in particular relates to an acidic soil improver and its preparation method and application. Background technique [0002] With the development of social economy and agriculture, due to the long-term excessive application of nitrogen fertilizer and other reasons, the area and degree of acidified soil in my country are gradually increasing. Soil acidification not only causes a large loss of nutrients in the soil such as potassium, calcium, magnesium, etc., but also increases the solubility of various metals and heavy metal compounds in the soil, resulting in the harm of heavy metals in the soil to the environment. In addition, soil acidification will also destroy soil aggregates structure, leading to poor soil ventilation and water permeability, reducing the availability of phosphorus and other environmental problems, seriously affecting the ability of my country's agricultural...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40C05G3/80C09K101/00C09K109/00
CPCC05D9/00C05G3/80C09K17/40C09K2101/00C09K2109/00C05F11/02C05G1/00
Inventor 谢婧婧宋天顺
Owner NANJING TECH UNIV
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