State the basic principle that governs how water moves through the SPAC. Give two examples, one at the soil–root interface and one at the leaf– atmosphere interface. What is the role of evaporation...

State the basic principle that governs how water moves through the SPAC. Give two examples, one at the soil–root interface and one at the leaf– atmosphere interface.

What is the role of evaporation from the soil (E) in determining water-use efficiency, and how does it affect ET? List three practices that can be used to control losses by E.