The soil organic matter content is gradually decreasing from Northeast to Northwest China
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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.
Microorganisms will obtain the maximum growth rate at the optimal growth temperature, but the microorganisms will stop growing or die when the temperature exceeds the minimum or maximum limit.