I have the 210 tomato/vine system. What temperature must I maintain in my greenhouse in order to grow tomatoes during the fall/winter? I'm in Oregon and the avg min. temp in the coldest part of winter is 34.

Also, how long during the day should I maintain about 80 degrees for growth?

Recommended winter temperatures for tomatoes are 65-75f during the day and 61-68f during the night. These temperature differentials are required for strong flower development and good fruit set. Optimum humidity is 65%-85%. RH above 90% creates winter disease risk from Botrytis. Optimal day length is 16 hours.

Ok, how about summer time temps? My greenhouse w/o ventilation can exceed 100 degrees. Growing up in Oklahoma (I live in Oregon now) our outside tomatoes didn't seemed to be bothered by high temperatures. I can ventilate and cover to keep temp down. What is the temp range that I should keep them?

Optimum Temperature for tomato plants is between 77 to 86 degrees Fahrenheit. Air temperature has a major effect on tomato crop growth and there is a narrow range in which growth is optimal. I recommend purchasing Dr. Lynette Morgan's new Hydroponic Tomato Production Book <http://www.amhydro.com/index.php/Education/438-Hydroponic-Tomato-Crop-Production/flypage.tpl.html> Happy Growing!

For the "210 tomato/vine" system, how long and often do I run the pump? I just transplanted my rockwool tomato starts yesterday and can't find anything in the documentation for tomatoes.

The first very important piece of knowledge that a grower must understand is that it is light intensity that drives plant transpiration. The light energy impinges on the plants leaves and warms them. The leaves respond by opening their stomata exposing water to the atmosphere and this evaporates and cools the plant. If the sun is too intense and the plant cannot provide enough water to the leaves then wilt will occur.

For general irrigation time and length using a timer, start out with (3) irrigation's per day, 15 minutes per irrigation. Make adjustments off of that as needed depending on plant transpiration (light intensity).