题目内容
In the Carbon Cycle there are four main reservoirs for carbon. What is the largest carbon sink?
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Bacteria that live in the soil and in symbiotic relationships with plants called legumes take nitrogen from the atmosphere and turn it into ammonia (NH3), a form that is usable by plants. This process is called...
Soil particles are classified into four basic soil classes based on particle size, namely gravel, sand, ______ and clay.
In agricultural soils, soil profile can be divided into ______ , subsurface layer and bottom layer from top to bottom.
The main pathways of soil available nitrogen loss are ______ and denitrification.
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