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Humic acid is undissolved in acid solution

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The decomposition rate of sugar was higher than that of lignins and phenolic compounds

The soil organic matter content is gradually decreasing from Northeast to Northwest China

There are three distribution regions for the black soil in the world including ______ , Ukrainian plain, and Mississippi River basin.

According to the different determination principles, the methods for analyzing microbial biomass can be divided into three categories: component analysis, substrate-induced respiration and fumigation.

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