Manipulate temperature to affect plant growth.

Manipulation should include

• establishing optimum and tolerable air temperature ranges
• calculating average daily temperature
• researching temperature recommendations
• regulating substrate temperature
• stratifying seeds
• chilling bulbs
• explaining how to control stem elongation through DIF and DIP.

Process/Skill Questions:

• When must a grower regulate the temperature of growing plants?
• Why would a grower manipulate soil temperature?
• How is temperature manipulated?
• How do DIF and DIP affect plant growth?