摘要：

A new scheme of qualitative analysis of humus that is said to distinguish between the different types of humus found in different genetic soil types was used. The following groups of humus substances were separated and quantitatively determined: (I) bitumens, soluble in a mixture of alcohol and benzene; (2) humic acids, soluble in o.I n. NaOH, precipitated by acids; (3) fulvic acid, in the filt...

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