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Acidic soil biomass charcoal improver as well as preparation method and application thereof

A technology for acidic soil and biomass charcoal, which is applied in application, land preparation methods, soil conditioning materials, etc., can solve the problems of low carbon-alkali content, large amount of straw biomass charcoal, and poor improvement effect of acidic soil.

Pending Publication Date: 2021-08-03
INST OF SOIL SCI CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved: the present invention aims at the problems that the charcoal content of biomass prepared from common crop straws is relatively low, the improvement effect on acidic soil is not good, the amount of straw biomass charcoal is large and the application cost is high, etc., and provides an acidic soil biochar. Substance carbon modifier and its preparation method and application

Method used

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  • Acidic soil biomass charcoal improver as well as preparation method and application thereof
  • Acidic soil biomass charcoal improver as well as preparation method and application thereof
  • Acidic soil biomass charcoal improver as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Biomass carbon alkali content and potassium, calcium, magnesium content

[0031] Sunflower stalks were collected from Bayannur, Inner Mongolia, where these sunflowers grow on the saline-alkaline soil of the region. After sunflower seeds are harvested, the sunflower leaves, disks and stems are used to collect materials, and they are brought back to the laboratory to be air-dried and ground for later use. At the same time, rice straw and rape straw were collected in Nanjing, Jiangsu, and the two straws were treated in the same way for comparative research. Different organic materials were loaded into ceramic crucibles, pressed tightly, covered with a lid, and then put into a muffle furnace for carbonization at 400°C for 3 hours. After cooling, it is used for the determination of alkali content and potassium, calcium and magnesium. figure 1 The results showed that the alkali content of biochar prepared from sunflower leaves and discs was much higher than that of rapeseed...

Embodiment 2

[0034] Improvement effect of biochar on red soil in dry land under culture experiment conditions

[0035] Weighed 200 g of air-dried acidic red soil (collected from Yingtan, Jiangxi), and added rice peat charcoal and biochar prepared from sunflower leaves, discs and stems respectively according to 1% of the soil weight. The treatment without biochar was set as the control. Mix the soil sample and biochar thoroughly and put them into a disposable plastic cup, adjust the soil water content to 60% of the field water holding capacity of the soil with deionized water, seal the plastic cup with a plastic film, and leave 5 A small hole with a diameter of 2 mm allows gas exchange and reduces water loss. Then the plastic cups were placed in a constant temperature incubator at 25°C for 30 days in the dark. Weigh and rehydrate every 3 days to keep the soil moisture content constant. After the cultivation, the soil samples were taken out, air-dried, ground, and passed through a 60-mesh ...

Embodiment 3

[0038] Improvement effect of biochar on acidic paddy soil under culture experiment conditions

[0039] Collect acidic paddy soil from Yingtan, Jiangxi and Changsha, Hunan respectively, air-dry and grind the soil samples, then add corn stalk charcoal and sunflower tray biochar at a ratio of 3% of the soil weight, and mix them as described in Example 2 The method was used for constant temperature cultivation, and the soil pH was measured after 30 days of cultivation. Figure 11 and Figure 12 The results showed that the effect of adding sunflower disc biochar on the pH of the two paddy soils was far superior to that of corn straw charcoal, showing an excellent improvement effect on acidic paddy soil.

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Abstract

The invention relates to an acid soil biomass charcoal modifier and a preparation method and application thereof. The acid soil biomass charcoal modifier is prepared by air-drying and grinding harvested leaves and discs of sunflowers growing on saline-alkali soil and then carrying out anaerobic pyrolysis at 400 DEG C. The biomass charcoal improver is high in alkali content and strong in acid neutralization capability. By adding 1-3% of biomass charcoal into acidic dry land soil and rice soil, the pH of the soil and the content of exchangeable potassium, calcium and magnesium can be effectively increased, exchangeable aluminum in the soil is reduced, aluminum toxicity is relieved, and toxic heavy metal cadmium in the acidic rice soil is passivated. Therefore, the acid soil biomass charcoal modifier is efficient.

Description

technical field [0001] The invention belongs to the technical field of soil improvement, and in particular relates to an acidic soil biochar modifier and a preparation method and application thereof. Background technique [0002] The soil in tropical and subtropical regions in southern my country is generally acidic (Zhao Qiguo et al., 2002. Science Press). The low pH and aluminum toxicity of acidic soils severely limit crop growth and agroforestry production on such soils. In recent years, due to acid deposition and excessive application of ammonium nitrogen fertilizers, the rate of soil acidification has accelerated and the scope of acidification has further expanded (Guo et al., 2010. Science, 327: 1008–1010). The traditional method of improving acidic soil is to use alkaline substances such as lime to neutralize soil acidity and increase soil pH. Although this method is effective, it needs to consume a large amount of mineral resources, and there is a problem of soil...

Claims

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Application Information

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IPC IPC(8): C09K17/04C09K17/06C05G3/80B09C1/08A01B79/02C09K101/00C09K109/00
CPCA01B79/02B09C1/08C09K17/04C09K17/06C09K2101/00C09K2109/00C05G3/80
Inventor 徐仁扣黄清杨陆海龙姜军
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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