CCA Fertilizer Sources and Application 2

Question 1

Which fertilizer source has the highest nitrogen content by weight at approximately 82%?

Accepted Answer

Anhydrous ammonia

Answer

Urea

Answer

Ammonium nitrate

Answer

Urea-ammonium nitrate (UAN)

Question 2

What is the primary advantage of polymer-coated urea over conventional urea?

Accepted Answer

Reduced volatilization and controlled release over time

Answer

Higher nitrogen content

Answer

Lower cost per unit of nitrogen

Answer

Better solubility in water

Question 3

Diammonium phosphate (DAP) has an approximate analysis of:

Accepted Answer

18-46-0

Answer

10-52-0

Answer

21-0-0

Answer

46-0-0

Question 4

When applying potassium chloride (muriate of potash) to a chloride-sensitive crop, what is the best alternative potassium source?

Accepted Answer

Potassium sulfate

Answer

Potassium nitrate

Answer

Potassium bicarbonate

Answer

Potassium permanganate

Question 5

Which application method best reduces ammonia volatilization loss when surface-applying urea?

Accepted Answer

Incorporating urea into the soil or injecting it

Answer

Applying during midday heat

Answer

Broadcasting urea on wet foliage

Answer

Applying urea to alkaline soils only

Question 6

What is the primary reason sulfur-coated urea releases nitrogen more slowly than uncoated urea?

Accepted Answer

The sulfur coating must degrade or crack before water can dissolve the urea

Answer

Sulfur reacts with nitrogen to form stable compounds

Answer

Sulfur increases soil pH, slowing nitrification

Answer

Sulfur blocks urease enzyme activity indefinitely

Question 7

A producer wants to apply 120 lbs N/acre using urea (46-0-0). How many lbs of urea per acre are required?

Accepted Answer

261 lbs/acre

Answer

55 lbs/acre

Answer

120 lbs/acre

Answer

552 lbs/acre