Add Yahoo as a preferred source to see more of our stories on Google. Decomposition can be accomplished by worms, fungi, bacteria, or other microorganisms to produce soil humus naturally. It can also ...

The yields of many important crops in Europe have been stagnating since the 1990s. As a result, the input of organic matter into the soil -- the crucial source for humus formation -- is decreasing.

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Stagnating crop yields pose a threat to soil. The yields of many important crops in Europe have been stagnating since the 1990s. As a result, the input of organic matter into the soil – the crucial ...