Warren County Connection A Publication of Cornell Cooperative Extension of Warren County
October 2020
Biochars and Their Uses in Agriculture By Sandy Vanno, Master Gardener Warren County Although it has been around since the times of ancient tribes, biochar is only recently becoming a popular topic of discussion among modern home gardeners, commercial farmers, land managers, and wastewater treatment operators. Originating from the term “terra preta” or dark earth, the use of biochar has been around for thousands of years. Many practices have been proven to increase soil health and fertility, such as manure application, cover crops, and no-till. Biochar, an emerging soil amendment, also shows promise in improving soil health and fertility.
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generating energy. This reduces the amount of air emissions. The material used as a source for producing biochar is a key point in what makes biochar a popular topic. Biochar can be produced from a variety of materials- trimmings from woodland and yard maintenance, agricultural waste like corn stalks, and purpose-grown biomass such as bamboo. The pH and composition of the biochar that is produced are directly linked to the material used to produce the biochar, so if making your own, be sure to avoid contaminants such as treated or painted lumber. From Cornell CALS Soil and Crop Sciences Section:
What is biochar? It is a fine-grained, black charcoal material. It is different from traditional charcoal, mostly in that it is generally designed for use as a soil amendment instead of as a fuel for heating or cooking. When an organic material, like wood, is burnt, it gives off smoke that contains methane, carbon dioxide, and carbon Benefits of Biochar: monoxide gases. These gases are Increased moisture retention in then typically released to the atmossoils; good for plant growth phere. During the process of creating when there is limited rainfall; biochar and charcoal, known as pygood for water quality because it rolysis (high temperature 500°C or reduces runoff 932ºF), the smoke given off is cap Increased nutrient retention in tured in a closed system. That smoke soils; good for plant growth in is redirected back to the heat source soils with poor nutrient content; to add more energy to the charcoal, good for water quality because it or an alternative heat source, then reduces nitrogen leaching into used as fuel for another process like (Continued on page 3)
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