CHT Soil Science & Fertilization

Question 1

What soil pH range is generally considered optimal for most horticultural crops?

Accepted Answer

5.5–7.0

Answer

A pH of 5.5–7.0 supports nutrient availability and microbial activity optimal for most horticultural plants.

Question 2

Which macronutrient is primarily responsible for promoting leafy, vegetative growth?

Accepted Answer

Nitrogen (N)

Answer

Nitrogen (N) drives chlorophyll production and cell division, making it the key driver of vegetative, leafy growth.

Question 3

A soil test result shows a CEC of 25 meq/100g. What does this indicate?

Accepted Answer

High clay or organic matter content

Answer

A high CEC (cation exchange capacity) indicates abundant clay or organic matter, which holds more nutrient cations for plant uptake.

Question 4

Which fertilizer analysis number represents phosphorus content?

Accepted Answer

Second number

Answer

The N-P-K label lists nitrogen first, phosphorus (as P₂O₅) second, and potassium (as K₂O) third.

Question 5

Slow-release fertilizers are preferred in professional horticulture primarily because they:

Accepted Answer

Reduce leaching and provide sustained nutrition

Answer

Slow-release fertilizers reduce nutrient leaching, lower burn risk, and supply steady nutrition over weeks or months.

CHT - Certified Horticultural Technician Practice Test