GDD (Growing Degree Days)

PNW_D · July 1, 2006

One of my favourite topics :wink:

Here is a link that provides GDD for PNW:

http://pnwpest.org/cgi-bin/ddmodel.pl?spp=scn

Corn is the closest to tomatoes for comparison. I thought it was interesting how stages of corn growth can be compared to GDD, and starting thinking about how GDD relates to tomato growth (apart from ripening).

I have done some very basic record keeping in the past related to ripening, but perhaps will start making notes on tomato set as well.

Weather here has been unbelievable, and I have tomato set on many of my plants; Orange-1 and Purple Russian are amazing so far!!

And, for those that are interested, GDD as suggested in Territorial's 2002 catalog:

Ultra-Early: 1100 heat units (=GDD)
Extra-Early: about 1300 heat units
Early: up to 1500 heat units

July 1, 2006	#1
PNW_D Tomatovillian™ Join Date: Jan 2006 Location: West Coast, Canada Posts: 961	GDD (Growing Degree Days) One of my favourite topics :wink: Here is a link that provides GDD for PNW: http://pnwpest.org/cgi-bin/ddmodel.pl?spp=scn Corn is the closest to tomatoes for comparison. I thought it was interesting how stages of corn growth can be compared to GDD, and starting thinking about how GDD relates to tomato growth (apart from ripening). I have done some very basic record keeping in the past related to ripening, but perhaps will start making notes on tomato set as well. Weather here has been unbelievable, and I have tomato set on many of my plants; Orange-1 and Purple Russian are amazing so far!! And, for those that are interested, GDD as suggested in Territorial's 2002 catalog: Ultra-Early: 1100 heat units (=GDD) Extra-Early: about 1300 heat units Early: up to 1500 heat units __________________ D.