Question

______ are mixed in the seeding medium to give good drainage and aeration.
a. peat moss and vermiculite
b. perlite and peat moss
c. sand and perlite
d. sand and sphagnum moss

Explanation:

To determine the correct answer, we analyze the properties of each option for drainage and aeration in a seeding medium:

• Option a: Peat moss retains moisture, vermiculite holds water and nutrients. Not ideal for drainage/aeration.
• Option b: Peat moss (moisture - retaining) and perlite (light, porous). Peat moss reduces drainage focus.
• Option c: Sand (improves drainage) and perlite (porous, light, enhances aeration/drainage). Both are good for drainage and aeration.
• Option d: Sphagnum moss retains moisture, sand helps drainage. But sphagnum moss doesn't aid aeration like perlite.

So, sand and perlite are best for good drainage and aeration.

Answer:

c. Sand and perlite