Abstract
Seasonal fluctuations of humus pH of three commonly occurring forest soils in Quebec were assessed to determine which of four different methods was best suited for comparisons of pH among sites. Seasonal variations of 1.1 to 1.3 unites were observed on all soil types tested. Humus pH was highest in midsummer and decreases as winter approached. Different pH values were obtained from the same soil at the same time by the different methods used. Reproducibility of pH measurements is briefly discussed.

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