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

Organic matter content

Answer

Cation exchange capacity (CEC)

Answer

Soil texture classification

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

They fix atmospheric nitrogen directly into plant tissue

Answer

They break down fertilizer pellets into soluble forms

Answer

They produce growth hormones that replace the need for fertilizer

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

Boron

Answer

Manganese

Answer

Copper

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

Higher guaranteed nutrient analysis on the label

Answer

Faster nutrient release and immediate availability

Answer

Lower pH-buffering capacity in alkaline soils

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

1 lb

Answer

5 lb

Answer

15 lb

Question 6

Which practice helps prevent nutrient leaching and runoff when fertilizing trees in areas adjacent to storm drains or waterways in Albuquerque?

Accepted Answer

Use slow-release or controlled-release formulations and apply within the drip line

Answer

Apply fertilizer just before heavy irrigation or rainfall

Answer

Broadcast granular fertilizer on impervious surfaces for even distribution

Answer

Double the application rate to compensate for expected losses

Question 7

Phosphorus is often described as 'fixed' or immobile in soil. What does this mean for fertilizer application strategy near trees?

Accepted Answer

Phosphorus moves very little in soil and must be placed near active roots to be effective

Answer

Phosphorus should always be applied as a foliar spray to ensure uptake

Answer

Phosphorus leaches rapidly and requires frequent reapplication

Answer

Phosphorus availability is unaffected by soil pH