Description of practice
Biochar is produced from pyrolysis (thermal decomposition of biomass in partial or total absence of oxygen) of plant and waste feedstock and is used as a soil amendment. Biochar is a stable solid, rich in carbon and can have benefits for plant growth. Its particle size distribution and carbon storage fertilizer (P, K, S, and Mg only) and liming properties vary.
Examples of how to use biochar | Further information (see Note below) |
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Biochar application for carbon sequestrationBiochar is applied every few years to increase carbon sequestration. In order to contribute to climate regulation, the quality of the pyrolysis process, its carbon storage value, application rate and deep incorporation in the soil are important. Improved productivity may avoid future need for further land conversion. |
»ETH Zürich |
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Biochar application for land restorationBiochar is used as a soil amendment for land restoration. It can enhance the cation exchange capacity and absorb nutrients for slow release. Initially it is important to mix biochar with nutrient-rich organic material such as manure or compost. The largest effect on yield is seen on degraded land. |
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Biochar application for prevention of nutrient leaching and pollutionBiochar is applied to soil to prevent nutrient leaching. It can also raise the pH and reduce problems with aluminum toxicity and heavy metals. However, due to strong sorption of pesticides, increased pesticide concentrations can also build up. |
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Biochar application to make dryland agriculture more resilient to droughtBiochar is applied to soils to make dryland agriculture more resilient to water deficiency. Acting over a long period, biochar improves soil moisture and nutrient capacity, activates microorganisms and raises pH. |
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Note: Most of the Further information links are to a full description of the example in the WOCAT database. However sometimes the link may be to similar practices or a research paper. Occasionally the link is to a commercial product in which case it should be understood that this does not imply any endorsement of the product by iSQAPER.