December 21, March 21, June 21, and September 21 are important dates for greenhouse growers because:
A) major holidays fall close to them.
B) they represent major changes in seasonal temperatures.
C) they represent important photoperiodic events.
D) they are when orders should be placed for seeds and plugs.
Question 2
Which of the following describes the impact of the perched water table in deep containers compared to shallower containers holding the same media formulation.
A) It is greater in the deep container.
B) It depends on the material the containers are made from.
C) It is less in the deep container.
D) There is negligible difference.
