Problem 1
. Compare and contrast key aspects of the cycling of carbon, nitrogen, phosphorus, and sulphur.
Problem 2
The use of nitrogen and phosphorus fertilizers is crucial to modern agriculture, yet these materials are manufactured from non-renewable resources and may not be so readily available in the future. What would be the consequences for agricultural production if these fertilizers were to become more expensive and less available?
Problem 4
If soil becomes acidic, the process of nitrification may no longer occur. What are consequences of this change for the nutrition of plants?
