题目内容
The decomposition rate of sugar was higher than that of lignins and phenolic compounds
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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.
Beneficial rhizosphere microorganisms will promote the growth of crops, while harmful ones will aggravate plant diseases.
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