Growth effects proven in more than 1,200 studies
The number of studies looking at the positive effects of biochar on plant growth, soil quality and air is increasing rapidly.
The numerous results were summarised and aggregated in a meta-study.
Plants
16% plant growth (biomass, grain yield) (1254 studies)
27% increase in carbon storage capac(322 studies)
19% more efficient water utilisation of the plant (147 studies)
soil
45% increase in plant-available phosphorus (537 studies)
26% nitrate leaching into water (156 studies)
Air
38% nitrous oxide emissions (435 studies)
61% methane emissions (435 studies)
Prof. Dr. Claudia Kamann et. al., 2021
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Benefits from increased yield
The positive growth-promoting properties of biochar lead to a noticeable increase in yields per hectare. Taking the mean value of the meta-studies as a basis, the benefits of this effect can be quickly determined. For example, if the yields per hectare are 30,000 €/year, then the use of biochar can generate an average of 4,800 € more per hectare.
At present, it is assumed that applying 2 tonnes of biochar per hectare per year over a period of several years is sufficient.
Water storage capacity
In recent years, one particular property of biochar has gained a great deal of importance. Due to its very high specific surface area, which is around 300 m² per gramme, biochar can store water as effectively as a sponge.
This water storage capacity contributes significantly to reducing the risk of crop failure due to drought.