Hort 1 Fertilizers

The three primary nutrients necessary for plant growth are:

• boron, calcium, and iron

• chlorine, sulfur, and zinc

• nitrogen, phosphorus, and potassium

• magnesium, manganese, and molybdenum.

Which is true of macronutrients?

• All six are listed on the fertilizer label.

• They are present in the soil in the smallest amounts

• They are used by the plants in large amounts.

• They are used by the plants in small amounts.

Which group includes micronutrients?

• Carbon, hydrogen, and oxygen

• Copper, manganese, and zinc

• Nitrogen, phosphorus, and potassium

• Sulfur, magnesium, and water

Calcium, magnesium, and sulfur are:

• macronutrients

• micronutrients

• primary elements

• secondary elements

What is the function of nitrogen in plant growth

• makes seeds

• produces healthy green color

• produces yellow color in leave

• protects plants against winterkill

Angel selects a fertilizer that will promote good green growth for the leaves and stems of her houseplants. The fertilizer will most likely contain the primary element:

• chlorine

• copper

• nitrogen

• zinc

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

• cupped or curled leaf tips

• purplish color in older leaves

• rotting fruit on young plants

• yellow leaves with green veins

Which nutrient do plants need in the greatest quantity?

• calcium

• nitrogen

• sulfur

• zinc

Sue uses a fertilizer that promotes early formation and growth of roots and increases the plant's hardiness and disease resistance vigor. Her fertilizer will most likely contain what primary element?

• boron

• chlorine

• phosphorus

• zinc

Which elements do plants need in the smallest amounts?

• macronutrients

• micronutrients

• primary elements

• secondary elements