Solution chemistry in acid forest soils: are the BC : Al ratios as critical as expected in Switzerland?

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Graf Pannatier, E., Walthert, L., & Blaser, P. (2004). Solution chemistry in acid forest soils: are the BC : Al ratios as critical as expected in Switzerland? Journal of Plant Nutrition and Soil Science, 167(2), 160-168. https://doi.org/10.1002/jpln.200321281