UC Nursery and Floriculture Alliance
University of California
UC Nursery and Floriculture Alliance

Greenhouse Management Workshop Aug 31, 2010 (UC Davis)

Greenhouse Management Workshop: Controlling Temperature and Relative Humidity 
Bowley Plant Sciences Center   (Directions)
Old Hutchison Drive, UC Davis
August 31, 2010
7:30 am - 4:30 pm

Moderator/Speaker: Dr. Heiner Lieth, Dept. of Plant Sciences, UC Davis

This is a one-day program designed to teach participants the best management practices with regard to controlling temperature and relative humidity. The target audience is any person who has had some introduction to greenhouses and growing plants in greenhouses. Greenhouse environment optimization is always the first step, and indeed the foundation of a functioning Integrated Pest Management program. IPM programs can only work in uniform environments with known, precisely controlled temperature and relative humidity conditions. As such PCAs may find this course useful.

The greenhouse environment has specific objectives for professional growers. Temperature and relative humidity are important variables that need to be controlled, each in concert with each other while at the same time creating uniform conditions in the greenhouse so as to result in uniform crop production throughout the greenhouse. This uniformity is key to proper pest and disease management. While each crop has specific ideal ranges of temperatures, light and relative humidity, this workshop is not crop-specific; instead the focus will be to discuss the best management practices needed for any greenhouse crop.

Each participant will receive a detailed outline of the lectures. Participants will also get access to a web-page of materials specifically prepared for this workshop.

Registration fee: $95 per person

Online Credit Card Registration (Master Card, VISA, AmEx, Discover)

Mail or FAX Registration Form

Continuing Education Units approved: CDPR (3), CCA (pending)


7:30 - 8:00 am

Registration, orientation, introductions

8:00 - 8:45 am

Greenhouse structures throughout the world; how the various global markets dictate the types of greenhouses; what is the ideal level of technology in California and why is this different from the Netherlands, South America and Asia.

8:45 - 9:45 am

Introduction to Temperature management: Types of controllers and sensors; level of accuracy and precision of control technology (what can you afford; what should you have as a minimum level; how do you decide?). Convection tubes vs HAF. How to optimize uniformity. Objectives for heating (Why are growers in warm climates at a disadvantage if they don’t have heating systems). What you need to know about trapping heat at the end of the day.

9:45 – 10:00 am


10:00 – 11:00 am

Heating greenhouses: types of systems and how they work (forced hot air, hot water, steam, radiant, bench-top heating, below-bench heating,....

Heating Systems control and optimization; various important facet DIF, temperature integration, ...

11:00 am - 12:30 pm

Cooling Systems: types of systems and how they work (passive vs forced air); Costs associated with cooling. Achieving uniformity (what level can you afford?) What is realistic for warm climates such as Southern California.

12:30 – 1:00 pm

Lunch (Sponsored by Target Specialty Products)

1:00 – 2:30 pm

Computer-controlled temperature and relative humidity control. How does relative humidity control work? What are our options? Why do many growers not use it? Implications of poor humidity control or ignoring it. Integrated approach to year-round optimization. How to implement DIF (as well as similar schemes) and why.

2:30 – 2:45 pm

Revisit: Uniformity - why this is the most important factor to control, especially with regard to pest and disease management.

2:45 – 3:00 pm


3:00 – 3:30 pm

Recap and Q&A

3:30 – 4:30 pm

Tour UC Davis Core Greenhouses

4:30 pm



Thanks to these additional sponsors (click on logos for websites):





ADA Wheelchair
 All UCNFA Programs are ADA Compliant. Should you need assistance, please contact us at least five days prior to the program.

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