Abstract
Background and aims
Silicon (Si) is largely recognized to improve plant growth subjected to various biotic and abiotic stresses. As plants accumulate Si in the form of readily-soluble phytolith, we examine the possibility of using phytolith-rich biochar as a bio-available Si source for increasing the agronomical productivity of Si high-accumulator plants while augmenting soil fertility and C sequestration.
Methods
By adding three different biochars (Miscanthus x giganteus straws, coffee husks and woody material) at two different concentrations (1 % and 3 %; w/w) to soil samples, we investigated the effects on the soil respiration, the chemical characteristics and the kinetic release of bio-available Si (CaCl2-extractable Si).
Results
Here we show that the biochar from Miscanthus straws was the most attractive amendment. Its incorporation at a 3 % rate improved the soil fertility parameters (pH and available cations) and combined the highest mean residence time of carbon (C) in soil (MRT = 50 years) with the highest rate of release of bio-available Si. We attribute this result to the presence of phytoliths in this biochar, as revealed by SEM-EDS analysis.
Conclusions
Not only did the biochar from Miscanthus enhance both soil C sequestration and fertility, but the results of this study suggest that it can also be considered as a potential source of bio-available Si. Although our conclusions should be substantiated in the field, we suggest that Miscanthus biochar could be used as a potential source of bio-available silicon for the culture of such crop as Si-accumulator plants growing, for instance, in highly weathered tropical soils with low content in carbon, nutrients and bio-available Si.
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Acknowledgments
We thank P. Populaire, M. Marteleur, A. Iserentant and C. Givron (UCL) for laboratory assistance. Cynthia Rozewicz is gratefully acknowledged for proofreading the manuscript. D. Houben was supported by the “Fonds pour la formation à la Recherche dans l’Industrie et dans l’Agriculture” (FRIA) of Belgium. J-T. Cornelis is supported by “Fonds National de la Recherche Scientifique » (FNRS) of Belgium. This research was also supported by the “Fonds Spécial de Recherche” of the UCL.
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Houben, D., Sonnet, P. & Cornelis, JT. Biochar from Miscanthus: a potential silicon fertilizer. Plant Soil 374, 871–882 (2014). https://doi.org/10.1007/s11104-013-1885-8
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DOI: https://doi.org/10.1007/s11104-013-1885-8