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

Anhydrous ammonia (NH3) contains approximately 82% nitrogen by weight, making it the most concentrated dry or liquid nitrogen fertilizer source.

Question 2

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

Accepted Answer

Reduced volatilization and controlled release over time

Answer

Polymer-coated urea releases nitrogen slowly over weeks to months, reducing volatilization losses and synchronizing N supply with crop demand.

Question 3

Diammonium phosphate (DAP) has an approximate analysis of:

Accepted Answer

18-46-0

Answer

DAP (diammonium phosphate) has a standard analysis of 18-46-0, meaning 18% N and 46% P2O5.

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 sulfate (K2SO4) provides potassium without chloride and is preferred for chloride-sensitive crops like tobacco and some fruits.

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

Incorporating urea into the soil through tillage or injection dramatically reduces ammonia volatilization by keeping urea in contact with soil moisture and cation exchange sites.

(CCA) Certified Crop Advisor Practice Test

(CCA) Certified Crop Advisor Practice Test

CCA Fertilizer Sources and Application 2