CATS Soil and Water 2

Question 1

Which soil horizon is most important for tree root development and nutrient uptake?

Accepted Answer

A horizon (topsoil)

Answer

The A horizon contains the highest concentration of organic matter and microbial activity, making it critical for root growth and nutrient absorption.

Question 2

What does the term 'field capacity' refer to in soil science?

Accepted Answer

The amount of water remaining in soil after excess has drained by gravity

Answer

Field capacity is the water content remaining in soil after gravitational drainage has ceased, typically measured 24–48 hours after saturation.

Question 3

In Albuquerque's arid climate, which irrigation strategy best promotes deep root development in trees?

Accepted Answer

Infrequent deep watering less often

Answer

Infrequent deep watering encourages roots to grow deeper in search of moisture, improving drought tolerance and structural stability.

Question 4

What is the primary cause of soil compaction around urban trees?

Accepted Answer

Foot and vehicle traffic

Answer

Foot and vehicle traffic are the leading causes of urban soil compaction, reducing pore space and limiting water infiltration and root growth.

Question 5

Which nutrient deficiency in alkaline Albuquerque soils most commonly causes interveinal chlorosis in trees?

Accepted Answer

Iron

Answer

Iron chlorosis is common in Albuquerque's alkaline soils because high pH locks up iron in insoluble forms, causing yellowing between leaf veins.

(CATS) Certified Arborist Tree Service of Albuquerque Practice Test

(CATS) Certified Arborist Tree Service of Albuquerque Practice Test

CATS Soil and Water 2