Nursery Landscape National FFA CDE exam 2019

Which of these is NOT a benefit of using mulch around landscape plants?

• add nutrients to the soil

• help control weeds

• help prevent bark damage when string trimming

• conserve soil moisture

Propagating plants using seeds that have a hard seed coat often involves scratching the seed coat in a process known as:

• Grafting

• Stratification

• Gradation

• Scarification

Correcting low soil pH can be achieved by applying:

• Lime

• Potassium

• Phosphorus

• Nitrogen

Fertilizer is often applied through the irrigation system. This is often referred to as:

• Fertigation

• Chemigation

• Post-fertilization

• Fertilizer enhancement

While the desirable soil pH for plants varies by species, a general range for most landscape plants is:

• 1.0 to 7.0

• 5.0 to 10

• 5.5 to 6.5

• 1.0 to 14

Which of the following is a naturally occurring plant hormone which causes the elongation of cells in shoots and is often used as a root-promoting substance on cuttings used for propagation?

• Ethylene

• Auxin

• Citric acid

• Portulaca

The amount of a pesticide required to kill half of a population is referred to as:

• LD50

• The re-entry level of a pesticide

• The half-life of the pesticide

• The 50-50 rating

A tree planted in the landscape that will grow up to 70 feet tall at maturity should be planted no closer than ______ feet from the house.

• 20 to 25
• 5 to 10

•  10 to 15

• 80 to 90

Iron chlorosis may be effectively treated with a product called ______ iron.

• Chelated
• Chlorotic

• Anti-deficiency

• Formosan

This is a common disease caused by fungi and found throughout the United States. It is easily recognized by a white to gray powdery growth, usually on the upper leaf surface.

• Mealy fungi syndrome

• Powdery mildew

• Cedar-apple rust

• Powdery scale