Phosphorus bioavailability of biochars produced by thermo‐chemical conversion

Journal of Plant Nutrition and Soil Science - Tập 177 Số 1 - Trang 84-90 - 2014
Bernd Weber1, Ernst A. Stadlbauer2, Elmar Schlich3, Sabrina Eichenauer2, Jürgen Kern4, Diedrich Steffens3
1Universidad Autónoma del Estado de México–Facultad de Ingeniería, Cerro de Coatepec s/n Col. San Buenaventura , Toluca, Estado de México 50130, Mexico
2THM‐Giessen‐Friedberg–Laboratory of Waste Treatment, Giessen, Hessen, Germany
3Justus Liebig University–Department of Process Engineering in Food and Servicing Business, Giessen, Hessen, Germany
4Leibniz‐Institute for Agricultural Engineering, Potsdam, Brandenburg, Germany

Tóm tắt

AbstractRecycling of P is a common strategy in efficient use of P. The aims of our investigation were to study the P extractability of biochars produced by low temperature conversion and to determine the effect of soda application on low‐temperature conversion of organic compounds and the bioavailability of P to rye grass (Lolium perenne L., cv. Grazer). In this study canola cake, dried distillers grains with solubles, and meat‐and‐bone meal were converted to biochars with thermo‐chemical conversion at 400°C. The P availability was measured in terms of solubility in water, 2% citric, and 2% formic acid, and in a pot experiment with rye grass (Lolium perenne L.) which was cut three times. Application of 8% (w/w) soda to the process of thermo‐chemical conversion of canola cake, dried distillers grains with soluble and meat‐and‐bone meal resulted in an increase of water‐, 2% citric‐, and 2% formic‐acid‐extractable P in the biochars. In contrast to the application of soda, addition of 12% wood ash (w/w) to the conversion of dried distillers grains with solubles resulted in a lower increase of water‐soluble P in the corresponding biochar compared to processing biochar without additives. Addition of biochar P (100 mg P [kg soil]–1) to a Luvisol resulted in an increase of CAL‐extractable soil P. The P uptake of rye grass from biochars produced with the addition of soda was as effective as basic slag and MgNH4 phosphate fertilizers and even better than rock phosphate.

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Journal of Plant Nutrition and Soil Science

Tập 177 Số 1

84-90

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