CATS Tree Nutrition and Fertilization 3

Question 1

Which component of a complete soil test is most important for determining lime or sulfur amendment rates for trees in New Mexico?

Accepted Answer

Soil pH and buffer pH

Answer

Soil pH and buffer pH measurements determine how much lime or acidifying amendment is needed to adjust pH to the target range for optimal nutrient availability.

Question 2

What is the function of mycorrhizal fungi in relation to tree nutrition?

Accepted Answer

They extend the effective root surface area to enhance water and nutrient uptake

Answer

Mycorrhizal fungi form symbiotic relationships with tree roots, dramatically extending the effective surface area for water and nutrient absorption, especially phosphorus.

Question 3

A newly transplanted tree in a New Mexico landscape shows slow establishment and pale foliage. A soil test reveals adequate macronutrients. What micronutrient should the arborist suspect given local soil conditions?

Accepted Answer

Iron

Answer

Iron deficiency is the most common micronutrient problem in New Mexico's alkaline soils, causing chlorosis and slow establishment even when macronutrients are adequate.

Question 4

What is the primary advantage of using organic fertilizers such as compost or composted manure compared to synthetic fertilizers for urban trees?

Accepted Answer

Improved soil biology, structure, and long-term nutrient cycling

Answer

Organic fertilizers improve soil microbial activity, structure, and organic matter content, contributing to long-term nutrient cycling and improved soil health.

Question 5

When calculating the amount of fertilizer needed to deliver 1 lb of actual nitrogen per 1,000 sq ft using a 10-6-4 fertilizer, how many pounds of product are required?

Accepted Answer

10 lb

Answer

A 10-6-4 fertilizer is 10% nitrogen by weight; to deliver 1 lb of actual N you need 1 ÷ 0.10 = 10 lb of product.

(CATS) Certified Arborist Tree Service of Albuquerque Practice Test

(CATS) Certified Arborist Tree Service of Albuquerque Practice Test

CATS Tree Nutrition and Fertilization 3