CFA Nutrient Management and 4Rs 2

Question 1

Which of the 4R principles addresses applying fertilizer in a way that minimizes leaching losses below the root zone?

Accepted Answer

Right Place

Answer

Right Source

Answer

Right Rate

Answer

Right Time

Question 2

A soil test shows a pH of 5.2. Which nutrient is most likely to become toxic to plants under this acidic condition?

Accepted Answer

Manganese

Answer

Calcium

Answer

Phosphorus

Answer

Molybdenum

Question 3

A corn farmer applies nitrogen in the fall but experiences a wet spring. Which loss pathway is the greatest concern for the applied nitrogen?

Accepted Answer

Denitrification

Answer

Volatilization

Answer

Immobilization

Answer

Fixation

Question 4

The Cation Exchange Capacity (CEC) of a soil directly affects which fertilizer management decision?

Accepted Answer

Determining split-application timing for nitrogen

Answer

Choosing between foliar and soil application

Answer

Setting application rates for phosphorus

Answer

Selecting between granular and liquid formulations

Question 5

Which fertilizer formulation would be most appropriate for correcting a mid-season sulfur deficiency in wheat?

Accepted Answer

Foliar application of potassium sulfate

Answer

Ammonium sulfate broadcast pre-plant

Answer

Banded MAP at planting

Answer

Side-dress urea at tillering

Question 6

Under the 4R framework, applying potassium in the fall for next year's corn crop is most consistent with which principle being compromised?

Accepted Answer

Right Time

Answer

Right Source

Answer

Right Rate

Answer

Right Place

Question 7

A field with a long history of poultry litter applications tests very high for phosphorus. The 4R recommendation would be to:

Accepted Answer

Switch to a nitrogen-only fertilizer and eliminate phosphorus inputs

Answer

Continue litter applications but reduce rates based on the P index

Answer

Apply the full nitrogen requirement from litter regardless of P buildup

Answer

Double the litter rate to improve organic matter