FREE CFA Soil Science and Testing Questions and Answers

Question 1

A soil test report indicates a Cation Exchange Capacity (CEC) of 5 meq/100g. What does this value suggest about the soil's properties and nutrient management requirements?

Accepted Answer

The soil is likely sandy, has a low capacity to hold nutrients, and requires frequent, smaller applications of fertilizer.

Answer

The soil is likely a heavy clay, has a high capacity to hold nutrients, and can be fertilized less frequently with larger amounts.

Answer

The soil has a high organic matter content, excellent water retention, and minimal risk of nutrient leaching.

Answer

The soil has a neutral pH, and most nutrients are readily available without the need for significant amendments.

Question 2

A farmer plans to grow alfalfa, which thrives in a soil pH range of 6.5 to 7.5. A recent soil test shows the field has a pH of 5.5. Which of the following problems is the farmer most likely to encounter if the soil is not amended?

Accepted Answer

Increased toxicity of aluminum and manganese, and reduced availability of phosphorus and calcium.

Answer

Deficiencies of iron and zinc, as they become less available in acidic conditions.

Answer

Excessive availability of nitrogen, leading to overly vegetative growth and poor forage quality.

Answer

Improved soil structure and water infiltration due to the acidic conditions.

Question 3

Which of the following soil components has the greatest influence on increasing both Cation Exchange Capacity (CEC) and water-holding capacity?

Accepted Answer

Organic Matter

Answer

Silt

Answer

Sand

Answer

Clay

Question 4

A soil test report shows a phosphorus (P) level of 15 ppm using the Mehlich-3 extractant. The recommendation is to apply 60 lbs of P2O5 per acre. The applicator has a fertilizer blend of 18-46-0. How many pounds of this fertilizer are needed to meet the phosphorus recommendation for one acre?

Accepted Answer

130 lbs

Answer

300 lbs

Answer

60 lbs

Answer

46 lbs

Question 5

Which soil property is a measure of the soil's ability to resist changes in pH?

Accepted Answer

Buffering Capacity

Answer

Soil Texture

Answer

Bulk Density

Answer

Porosity

Question 6

An applicator is managing a field with coarse-textured soil and low organic matter. Which of the following is the most significant challenge they will face regarding nutrient management?

Accepted Answer

High potential for nutrient leaching, especially nitrogen.

Answer

Poor soil aeration leading to root diseases.

Answer

Difficulty in tilling the soil due to compaction.

Answer

Excessive retention of phosphorus, making it unavailable.