HORTICULTURE

Detailed explanation-1: -Making it unavailable for plant use. While the pH of MOST commercial horticulture soiless mixes is neutral, the pH of bark, peat moss and sphagnum moss is: A. Acid.

Detailed explanation-2: -It has been determined that most plant nutrients are optimally available to plants within this 6.5 to 7.5 pH range, plus this range of pH is generally very compatible to plant root growth.

Detailed explanation-3: -If Vijay wishes to add weight to keep his gallon nursery stock from blowing over, what should he add to his soiless mix at planting? Marcy mixes perlite in her soiless mix.

Detailed explanation-4: -Sphagnum moss is perhaps the most desirable form of organic matter for the preparation of growing media. Drainage and aeration are improved in heavier soils while moisture and nutrient retention are increased in lighter soils.