Page 139 - Soil and water contamination, 2nd edition

126 Soil and Water Contamination

4. Describe the fate of nitrogen that has been added as fertiliser on arable land.
5. Explain why atmospheric deposition of aerosols is greater near the forest edge than
further away.

6. Is nitrate leaching from the root zone greater:
a. During summer or winter?
b. In dry sandy soils or moist loamy soils?
c. In soils with a shallow or deep water table?
d. In soils rich or poor in organic matter?
Give reasons for your answers.
7. Is ammonium volatilisation greater:
a. During summer or winter?
b. From acid or neutral soils?
c. In soils rich or poor in organic matter?
Give reasons for your answers.
8. What is the principal natural source of phosphorus in soil?

9. Indicate in a pH–Eh diagram (see Figure 2.3) the region where phosphate is most mobile.

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