CFA Soil Properties and Testing Questions and Answers

Question 1

A soil test report for a sandy loam field indicates a low Cation Exchange Capacity (CEC). Which of the following fertilizer application strategies is most appropriate for this field?

Accepted Answer

Split applications of fertilizer in smaller, more frequent doses throughout the growing season.

Answer

A single, heavy application of fertilizer prior to planting.

Answer

A large application of lime to dramatically increase the soil pH.

Answer

Applying fertilizer only in the fall to allow it to incorporate over the winter.

Question 2

Which of the following soil properties has the most significant influence on the availability of nutrients to plants, often referred to as the 'master variable' in soil fertility?

Accepted Answer

Soil pH

Answer

Soil texture

Answer

Soil organic matter

Answer

Bulk density

Question 3

A farmer receives a soil test result showing an optimal pH and adequate potassium levels, but a very low level of organic matter. Which of the following issues is most likely to be a concern for fertilizer management on this field?

Accepted Answer

Poor water infiltration and increased runoff potential.

Answer

Increased risk of phosphorus fixation.

Answer

Toxicity from an overabundance of micronutrients.

Answer

Difficulty in adjusting the soil's pH with liming agents.

Question 4

When interpreting a soil test report, the values for phosphorus (P) and potassium (K) are typically listed as 'low', 'optimum', or 'high'. If a soil test comes back in the 'high' range for phosphorus, what is the general recommendation for phosphorus fertilizer application?

Accepted Answer

No phosphorus fertilizer is needed, and application should be avoided.

Answer

Apply a starter fertilizer high in phosphorus to boost early growth.

Answer

Apply the standard recommended rate for the crop to be grown.

Answer

Double the application rate to build soil reserves for future crops.

Question 5

A certified applicator is preparing to fertilize a field with a heavy clay texture. Compared to a sandy soil, what is a key consideration for managing fertilizer on the clay soil?

Accepted Answer

Nitrogen will be converted to plant-available forms more slowly.

Answer

It will require more frequent fertilizer applications due to rapid leaching.

Answer

It has a lower capacity to store nutrients like potassium and calcium.

Answer

There is a higher potential for nutrient loss through runoff if not incorporated.

Question 6

A soil test report indicates a pH of 5.2. At this pH level, which of the following nutrient availability issues is most likely to occur?

Accepted Answer

Phosphorus availability is likely to be reduced.

Answer

Iron and manganese may become less available.

Answer

Molybdenum availability will be at its peak.

Answer

Potassium will be held more tightly by the soil colloids.