Hort I - Obj. 6.00

The three primary nutrients necessary for plant growth are:

• boron, calcium, and iron.

• chlorine, sulfur, and zinc.

• magnesium, manganese, and molybdenum.

• nitrogen, phosphorus, and potassium.

Which elements do plants need in the smallest amounts?

• Macronutrients

• Micronutrients

• Primary elements

• Secondary elements

Which group includes micronutrients?

• Carbon, hydrogen, and oxygen

• Copper, manganese, and zinc

• Nitrogen, phosphorus, and potassium

• Sulfur, magnesium, and water

The analysis of a fertilizer shows the amount of:

• boron, calcium, and water.

• carbon, hydrogen, and oxygen.

• nitrogen, phosphorus, and potassium.

• zinc, sulfur, and iron.

Soluble fertilizers dissolve in:

• air.

• ammonia.

• hydrogen.

• water.

Which is the analysis of an incomplete fertilizer?

• 5-10-10

• 10-10-10

• 15-0-14

• 20-10-20

A common symptom of a plant that has a phosphorus deficiency is:

• cupped or curled leaf tips.

• a purplish color in older leaves.

• rotting fruit on young plants.

• yellow leaves with green veins.

An advantage of organic fertilizer is that it:

• improves the physical condition of soil.

• is sterile.

• leaches quickly through the soil.

• releases into the soil rapidly.

What is the function of nitrogen in plant growth?

• Makes seeds

• Produces a healthy green color

• Produces a yellow color in leaves

• Protects plants against winterkill