DIF

[Will Neily]

Hi Edward:

DIF is a term used to describe the difference between the day and night
temperature in a controlled environment. A negative DIF (day temp <
night temp)is widely used in the greenhouse industry to reduce stem
elongation in floricultural species. The term was coined by Royal Heins
and his collegues at Michigan State U. 

Will Neily
Horticulture Dept.
Olds College
AB, Canada