CH Plant Nutrition and Fertilization

Question 1

Which macronutrient is most often responsible for the yellowing of older leaves (chlorosis) in nitrogen-deficient plants?

Accepted Answer

Nitrogen

Answer

Phosphorus

Answer

Potassium

Answer

Calcium

Question 2

A fertilizer labeled 10-10-10 contains equal percentages of which three primary nutrients?

Accepted Answer

Nitrogen, Phosphorus, Potassium

Answer

Nitrogen, Calcium, Magnesium

Answer

Phosphorus, Sulfur, Iron

Answer

Potassium, Boron, Manganese

Question 3

Which soil pH range generally maximizes nutrient availability for most landscape plants?

Accepted Answer

5.5–6.5

Answer

4.0–5.0

Answer

7.5–8.5

Answer

8.5–9.5

Question 4

Iron deficiency interveinal chlorosis on young leaves is most commonly caused by which soil condition?

Accepted Answer

High soil pH

Answer

Low soil pH

Answer

Excessive nitrogen

Answer

Low soil temperature

Question 5

Slow-release fertilizers benefit landscape plants primarily because they:

Accepted Answer

Reduce leaching and provide sustained nutrition

Answer

Increase salt index immediately

Answer

Lower soil pH rapidly

Answer

Eliminate the need for micronutrients

Question 6

Magnesium is considered a secondary macronutrient and is an essential component of which plant molecule?

Accepted Answer

Chlorophyll

Answer

Cellulose

Answer

Lignin

Answer

Pectin