Landscaping License Practice Test

What are iron chelates primarily used for in landscaping?

1. To enhance soil pH

2. To promote root growth

3. To correct yellowing of leaves

4. To control pest populations

The correct answer is: To correct yellowing of leaves

Iron chelates are primarily used in landscaping to correct yellowing of leaves, a condition that often results from iron deficiency in plants. This yellowing, particularly in young leaves, typically occurs when the soil's pH is too high, making iron less available to the plants. Iron chelates act as a soluble form of iron that plants can readily absorb, even in alkaline soils. By supplying this essential nutrient, iron chelates help restore the vibrant green color to the foliage, improving overall plant health and vitality. The other options pertain to different functions that are not the primary role of iron chelates. Iron chelates do not directly enhance soil pH; rather, they provide nutrients that can help mitigate the effects of high pH. While they can indirectly support root growth by improving overall plant health, their primary purpose is not to promote root development specifically. Lastly, iron chelates have no role in pest control, which involves different types of substances and strategies altogether.