Soils Test Questions

What is the percent of slope on land where the elevation falls 6 feet in 80 feet of horizontal distance.

• 0.075
• 0.055
• 0.065
• 0.08

Broadbase terraces are flatter looking terraces. They should not be on land slopes greater than

• 0.08
• 0.02
• 0.04
• 0.06

Other things being equal, a soil with 30% clay of the ____ type would be expected to have the greatest potassium -fixing capacity.

• 0.08402777777777777
• allophanic
• 0.042361111111111106
• crystalline iron oxide

The stability of basement walls, foundations, patios, sidewalks, and concrete floors anchored to the ground is affected by soils whose volume changes by more than

• 0.09
• 0.1
• 0.11
• 0.12

Contouring does not work well as a single practice to overcome soil limitations where slopes are irregular or on rolling topography where slopes exceed

• 0.09
• 0.05
• 0.14
• 0.18

Estimate the percentage of crop residue in a corn field, using CAM-line method, when the results of three observations were, 24, 37, and 41. The row spacing was 30 inches.

• 0.34
• 0.37
• 0.3
• 0.36

One year of corn followed by one year of oats and one year of meadow reduces soil loss by

• 0.6
• 0.5
• 0.4
• 0.7

The uptake of phosphorus by plants, on average, uses some phosphorus that was recycled in the soil from the previous generation of plants that gave detritus to the soil. How much of the uptake is recycled phosphorus?

• 0.98
• 0.82
• 0.35
• 1

When estimating surface crop residue, the number of times you should observe each site is

• 3
• 4
• 2
• 5

In estimating surface crop residue, the number of observations one should make at each site is

• 3
• 4
• 2
• 1