CCA Fertilizer Sources and Application 3

Question 1

Which fertilizer application timing strategy delivers nitrogen closest to peak crop demand, minimizing leaching risk?

Accepted Answer

Split application with starter plus side-dress at V6

Answer

Split application—starter at planting plus side-dress near peak uptake—synchronizes nitrogen supply with the period of highest crop demand, reducing leaching losses.

Question 2

The '4R' nutrient stewardship framework stands for right source, right rate, right time, and:

Accepted Answer

Right place

Answer

The 4R framework stands for Right Source, Right Rate, Right Time, and Right Place—collectively improving nutrient use efficiency and environmental stewardship.

Question 3

Which micronutrient fertilizer is most commonly applied to correct iron deficiency chlorosis in soybeans grown on calcareous soils?

Accepted Answer

Chelated iron (Fe-EDTA or Fe-EDDHA) applied as foliar or soil application

Answer

Chelated iron forms (EDTA or EDDHA) remain plant-available in high-pH calcareous soils where inorganic iron is rapidly fixed, making them the most effective treatment.

Question 4

What is the primary environmental concern associated with excessive phosphorus fertilization on sandy soils near water bodies?

Accepted Answer

Phosphorus leaching leading to eutrophication of surface waters

Answer

On coarse sandy soils, phosphorus can leach into groundwater and reach surface water bodies, causing algal blooms and eutrophication.

Question 5

Fertigation through drip irrigation is most advantageous because it:

Accepted Answer

Delivers soluble nutrients directly to the root zone with high precision and efficiency

Answer

Fertigation via drip irrigation places nutrients precisely in the active root zone, improving uptake efficiency and reducing runoff and volatilization losses.

(CCA) Certified Crop Advisor Practice Test

(CCA) Certified Crop Advisor Practice Test

CCA Fertilizer Sources and Application 3