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How to make Biochar in a cone pit, quick, simple & for free!
WHAT IS BIOCHAR?
Biochar is charcoal used as a soil amendment. Biochar is a stable solid, rich in carbon, and can endure in soil for thousands of years.
Like most charcoal, biochar is made from biomass via pyrolysis. Biochar is under investigation as an approach to carbon sequestration, as it has the potential to help mitigate climate change.
It results from processes related to pyrogenic carbon capture and storage.
Independently, biochar can increase soil fertility of acidic soils, increase agricultural productivity, and provide protection against some foliar and soil-borne diseases.
Regarding the definition from the production part, biochar is defined by the International Biochar Initiative as "The solid material obtained from the thermochemical conversion of biomass in an oxygen-limited environment".
SOIL AMENDMENT
Biochar is recognized as offering several benefits for soil health. Many benefits are related to the highly porous nature of biochar. This structure is found to be very effective at retaining both water and water-soluble nutrients.
Biochar is extremely suitable as a habitat for many beneficial soil micro-organisms. When pre-charged with these beneficial organisms, biochar becomes a highly effective soil amendment promoting good soil and, in turn, plant health.
Biochar has also been shown to reduce the leaching of E. coli through sandy soils depending on application rate, feedstock, pyrolysis temperature, soil moisture content, soil texture, and surface properties of the bacteria.
For plants that require high potash and elevated pH, biochar can be used as a soil amendment to improve yield.
Biochar can improve water quality, reduce soil emissions of greenhouse gases, reduce nutrient leaching, reduce soil acidity, and reduce irrigation and fertilizer requirements.
Biochar was also found under certain circumstances to induce plant systemic responses to foliar fungal diseases and to improve plant responses to infections caused by soilborne pathogens.
The various impacts of biochar can depend on the properties of the biochar and the amount applied, and there is still a lack of knowledge about the essential mechanisms and properties.
Biochar impact may depend on regional conditions, including soil type, soil condition (depleted or healthy), temperature, and humidity.
Modest biochar additions to soil reduce nitrous oxide N2O emissions by up to 80% and eliminate methane emissions, which are more potent greenhouse gases than CO2.
Studies have reported positive effects from biochar on crop production in degraded and nutrient-poor soils.
Applying compost and biochar under project FERTIPLUS has positively affected soil humidity, crop productivity, and quality in different countries.
Biochar can be designed with specific qualities to target distinct properties of soils.
In Colombian savanna soil, biochar reduced the leaching of critical nutrients, created a higher crop uptake, and provided greater soil availability.
At 10% levels, biochar reduced contaminant levels in plants by up to 80% while reducing total chlordane and DDX content in the plants by 68 and 79%, respectively.
On the other hand, because of its high adsorption capacity, biochar may reduce the efficacy of soil-applied pesticides needed for weed and pest control.
High-surface-area biochar may be particularly problematic; more research into the long-term effects of biochar addition to soil is needed.
PRODUCTION
Biochar is a high-carbon, fine-grained residue that today is produced through modern pyrolysis processes; it is the direct thermal decomposition of biomass in the absence of oxygen (preventing combustion), which creates a mixture of solids (the biochar proper), liquid (bio-oil), and gas (syngas) products.
The specific yield from the pyrolysis is dependent on process conditions, such as temperature, residence time and heating rate. These parameters can be optimized to produce either energy or biochar.
Temperatures of 400-500 °C produce more char, while temperatures above 700 °C favor liquid and gas fuel components yield.
Pyrolysis occurs more quickly at higher temperatures, typically requiring seconds instead of hours. The increasing heating rate will also lead to a decrease in pyrolysis biochar yield while the temperature is in the range of 350-600 °C.
Typical yields are 60% bio-oil, 20% biochar, and 20% syngas. By comparison, slow pyrolysis can produce substantially more char, contributing to terra preta's observed soil fertility.
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