16. What is the term used to describe the vertical movement of water through the soil?
a. Percolation
b. Infiltration
c. Transpiration
d. Precipitation
17. Which of the following nutrients is most likely to be deficient in a sandy soil?
a. Nitrogen
b. Phosphorus
c. Potassium
d. Calcium
18. Which of the following is a common method of soil conservation?
a. Crop rotation
b. Overgrazing
c. Deforestation
d. Soil compaction
19. What is the term used to describe the process of water moving upward from a wet soil layer to a dry layer above it?
a. Leaching
b. Capillary rise
c. Evaporation
d. Transpiration
20. Which of the following is a measure of the acidity or alkalinity of soil?
a. Electrical conductivity
b. Total dissolved solids
c. pH
d. Carbonate hardness
