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Method for carbonizing forestry waste in red-soil hilly area and application of method in soil acidity improvement

A technology for forestry waste and hills, applied in the field of waste resource utilization and soil improvement, can solve the problems of low temperature, complicated application method, long pyrolysis time, etc. Effect

Inactive Publication Date: 2016-10-12
WUHAN BOTANICAL GARDEN CHINESE ACAD OF SCI
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  • Claims
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Problems solved by technology

This patent uses peanut straw or broad bean straw as raw materials, and the application object is tea garden soil; during the carbonization process, the temperature is low (300 °C), the pyrolysis time is long (4 h), and the application method of acidic soil improvement is also relatively complicated (crushed to 100 mesh sieve)

Method used

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  • Method for carbonizing forestry waste in red-soil hilly area and application of method in soil acidity improvement

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Effect test

Embodiment 1

[0029] Example 1: Application of forestry waste biochar to improve acidic soil in red soil hilly area

[0030] The masson pine and fir residues collected in the red soil hilly area were naturally air-dried and crushed to a diameter of 1-5 cm, and heated to 480°C at a rate of 15-20°C / min in a conventional muffle furnace. Keep for 1.5 h; then, naturally cool to room temperature, which is the biochar product.

[0031] The obtained biochar was crushed to a diameter of <1 mm, mixed with the typical acidic soil Quaternary red clay (0-30 cm) in this area at a conversion ratio of 0.7 t / ha, and cultivated in the dark at 25°C. Add deionized water to each treatment regularly, keep the humidity at about 16%, and cultivate for 65 days;

[0032] After the cultivation, the results are shown in Table 1. Compared with the soil control without biochar, the soil with masson pine and Chinese fir residual biochar was applied, and the pH, exchangeable acid, and cation exchange capacity that charac...

Embodiment 2

[0036] Example 2: Application of forestry waste biochar combined with nitrogen fertilizer in red soil hilly area to improve acidic soil

[0037] The masson pine and fir residues collected in the red soil hilly area were naturally air-dried and crushed to a diameter of 1-5 cm, and the temperature was raised to 450°C at a rate of 15-20°C / min in a conventional muffle furnace. Keep it for 1 hour; then, cool it down to room temperature naturally, which is the biochar product.

[0038] The two kinds of biochar were mixed with the typical acidic soil "Huangjin mud" (0-30 cm) in this area at a conversion ratio of 0.7 t / ha, and nitrogen fertilizer was applied (converted at an application rate of 350 kg / ha). They were cultured in the dark at 25°C, and deionized water was regularly added to each treatment during the culture process, the humidity was kept at about 16%, and the culture duration was 60 days. After the cultivation, the results are shown in Table 2 below. Compared with the c...

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Abstract

The invention discloses a method for carbonizing forestry waste in a red-soil hilly area and application of the method in soil acidity improvement and belongs to the technical field of waste recycling and soil improvement. The method includes: (1), air-drying collected forestry waste naturally, and crushing to 1-5 cm; (2), carbonizing in an electric furnace or other sealable furnaces; (3), after carbonizing, naturally cooling to obtain a biochar product. The application refers to: (1), crushing the biochar product to 1 mm in diameter, and getting ready for use before application; (2), applying the biochar product solely or applying with other fertilizer; (3), spreading to the surface of soil, and tilling to a depth of 0-30 cm; (4), watering regularly to keep soil humidity to 15-20%. The biochar product may improve the soil acidification problem, improve soil quality and promote agricultural production; the materials are taken locally, and the biochar product is easy to popularize and has various benefits such as economic, environmental and social benefits.

Description

technical field [0001] The invention belongs to the technical field of waste resource utilization and soil improvement, and in particular relates to a method for carbonizing forestry waste in red soil hilly areas and its application in soil acidity improvement. Background technique [0002] According to the results of forest resources inventory in 2014, my country's forest area is 208 million ha, of which the area of ​​artificial forest is 69 million ha, ranking first in the world, especially in the red soil hilly area in southern my country, where the climate is hot and humid, and forestry resources are abundant, and a large area of ​​artificial forest is distributed. . A large amount of green organic waste such as bark, residual branches and tree roots is produced during the harvesting and utilization of plantations, which are traditionally used for cooking or heating. However, with the development of economy and society, and the process of urbanization, this traditional a...

Claims

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Application Information

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IPC IPC(8): C01B31/02C05G3/04A01B79/02C05G3/80
CPCA01B79/02C05G3/80
Inventor 赵汝东刘峰杨晓露姜庆虎
Owner WUHAN BOTANICAL GARDEN CHINESE ACAD OF SCI
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