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Supplemental Heat for Winter Greens Production: What's the Cost?

Ethan Grundberg, Vegetable Specialist
Eastern New York Commercial Horticulture

April 25, 2018

Winter Greens PFPWinter greens in high tunnels at then Poughkeepsie Farm Project

There seems to be little agreement among winter greens growers regarding the true costs and potential value of using supplemental heat all winter. With support from the Northeast Sustainable Agriculture Research and Education program (NE SARE) and the generous cooperation of the Poughkeepsie Farm Project (PFP), we tried to start gathering some data to add to the high tunnel heating debate. We tracked yield, soil nitrate availability, total nitrogen uptake, propane use, and soil temperature all winter in the two identical side-by-side 42'x196' double layer inflated poly Harnois high tunnels with one tunnel set to 33 degrees ambient air temperature and the other set to 40.

 

The data from the trial is still being analyzed, but here are a few key results that have emerged:

 

  • Maintaining adequate soil moisture and, ideally, living roots in the high tunnel before planting is necessary to preserve the soil microbial community that makes nitrogen available for plant uptake.
  • Soil nitrate levels were not significantly or consistently different between the two temperatures; however, total nitrogen uptake in the warmer tunnel was higher for curly kale, spinach, and especially for Salanova lettuce.
  • The warmer tunnel yielded three harvests in the same time that the cooler tunnel yielded only two.
  • It took 979 gallons of propane to heat the tunnel to 33 degrees from November through March. It took 2.1 times as much propane to add the extra 7 degrees to reach 40 over the same period.
  • Fertilizing to 70 pounds/acre of nitrogen in September provided sufficient nitrogen to kale, spinach, and Salanova until mid-February.
  • Targeted early spring fertigations with soluble Chilean nitrate carried those crops to maturity in early April

 

A big thanks to the great crew at PFP for all of the help tracking yield! Going forward, a group of vegetable specialists with Cornell Cooperative Extension hopes to continue to investigate fertility management in winter high tunnels generally and specifically the interplay between supplemental heating and nitrogen. If you are interested in collaborating, please reach out to Ethan at eg572@cornell.edu.

 

This article is from the April 26, 2018 edition of ENYCHP Vegetable News.  To read the full newsletter, CLICK HERE.



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Brussels Sprouts

Brussels Sprouts

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Cauliflower

Cauliflower

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Cherries

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Dry Beans

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Eggplant

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Ethnic Vegetables

Ethnic Vegetables

Garlic

Garlic

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Grapes

Horseradish

Horseradish

Kohlrabi

Kohlrabi

Leeks

Leeks

Lettuce / Leafy Greens

Lettuce / Leafy Greens

Melons

Melons

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Nectarines

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Peaches

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Potatoes

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Pumpkins / Gourds

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Radishes

Raspberries / Blackberries

Raspberries / Blackberries

Rhubarb

Rhubarb

Rutabaga

Rutabaga

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Snap Beans

Squash - Summer

Squash - Summer

Squash- Winter

Squash- Winter

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Sweet Corn

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Sweet Potatoes

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Tomatoes

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Upcoming Events

Cornell Winter Fruit Webinar Series 2025

Event Offers DEC Credits

January 17, 2025
January 31, 2025
February 14, 2025
February 28, 2025
March 14, 2025
: Cornell Winter Fruit Webinar Series 2025

Week 1: Digging Into Pruning and Soil Health

Week 2: Cider Apples - Mechanized Harvesting and Patulin Food Safety

Week 3: The Value of "Eco-Friendly" Marketing - OMRI, Red Tomato, EcoApple, NYS Grown and Certified

Week 4: Biopesticides and Controlled Environment Agriculture (CEA) for Berries

Week 5: St. Peachtrick's Day - Stone Fruit Insect and Disease Management

View Cornell Winter Fruit Webinar Series 2025 Details

Remote Produce Safety Alliance Grower Training Course

February 17 - February 18, 2025

REMOTE Produce Safety Alliance Grower Training Course

Monday, Feb. 17 and Tuesday, Feb. 18, 2025

8 am - 12:30 PM

Held remotely via Zoom (online)

Registration: $10 per person, open to NY state participants only

Includes printed course manual ($60 value), certificate of course completion ($35 value) and online food safety resources.

All produce growers are encouraged to attend this course to learn more about food safety practices recommended for all farms. This course contains NEW information contained in the finalized Subpart E rule on agricultural water. The PSA Grower Training Course is one way to satisfy the FSMA Produce Safety Rule requirement outlined in § 112.22(c) that requires 'At least one supervisor or responsible party for your farm must have successfully completed food safety training at least equivalent to that received under standardized curriculum recognized as adequate by the Food and Drug Administration.' If you've already earned your PSA certificate, retaking this course is a great way to refresh your memory and learn about the new water requirements!

After attending the entire course, participants will be eligible to receive a certificate from the Association of Food and Drug Officials (AFDO) that verifies they have completed the training course. 

View Remote Produce Safety Alliance Grower Training Course Details

From Seed to Success: Turn Your Idea into an Actionable Plan

January 7, 2025
January 14, 2025
January 21, 2025
January 28, 2025
February 4, 2025
February 11, 2025
February 18, 2025
February 25, 2025
March 4, 2025
: From Seed to Success: Turn Your Idea into an Actionable Plan

Do you need a business plan for your farm?  Do you have an idea for a new venture, but aren't sure if it will work? This program is for you!

This course is designed for existing farm businesses or those planning to undertake a new farm business venture. Students will work with their farm's data, and the goal of the class is for participants to have a draft of a written business plan for a specific business venture.

During the course, you will learn to:

  • Assess whether or not a business idea is a good fit for you.
  • Develop a marketing strategy to make a profit
  • Use financial tools to evaluate if your business has the potential to be profitable

This online course meets from January 7-March 4, 2025.  All course content is available online so you can work on it at your own pace.  There will be weekly webinars where you can meet other students and interact directly with the instructor on the content.  These webinars will be recorded. 

View From Seed to Success: Turn Your Idea into an Actionable Plan Details

Announcements

2025 CCE ENYCHP Fruit and Vegetable Conference

Join us for the Annual Eastern NY Fruit and Vegetable Conference February 19th and 20th, 2025 at the Desmond Hotel and Conference Center, 660 Albany Shaker Road, Albany, NY 12211

We are back with two full days of informative sessions and over 10 DEC Pesticide Recertification Credits Available!  Sessions this year include Tree Fruit, Vegetables, Small Fruit, Grapes, Bedding Plants and other related topics and visit with more than 50 vendors! 

For the full program, CLICK HERE or to register, CLICK HERE!

Program Overview & DEC Pesticide Recertification Credits:
Wednesday, February 19, 2025:
  • Tree Fruit Session 1, 9:00 am - 12:00 pm 2.0 Credits in Categories 10, 1a and 22
  • Tree Fruit Session 2, 1:15 pm - 4:00 pm 1.75 Credits in Categories 10, 1a and 22
  • Small Fruit Session,  9:00 am - 12:00 pm - 2.0 Credits in Categories 10, 1a and 22
  • Grape Session, 8:50 am - 11:45 am - 1.0 Credits in Categories 10, 1a and 22
  • H2A, 1:15 pm - 3:50 pm

Thursday, February 20, 2025
  • Tree Fruit Session 3, 8:20 am - 12:00 pm - 0.5 Credits in Categories 10, 1a and 22
  • Bedding and Vegetable Transplants, 9:00 am - 11:30 am - 1.50 Credits in 10, 1a,24 and 23
  • Vegetable Session, 1:15pm - 3:50pm - 1.5 Credits in Categories 10, 1a, 21, 23 and 0.25 Core
  • Marketing Session, 8:50 am - 12:00 pm
  • Funding Opportunities, 1:15 pm - 3:30 pm
Hope to see you there!



Resources from CCE ENYCHP!


This website (https://enych.cce.cornell.edu/) contains our calendar of upcoming programs and registration links. For updated programmatic information, technical resources and links to newsletters please see our program blog site: https://blogs.cornell.edu/enychp/.
We also maintain the following online resources that you can view directly from these links:

• CCE ENYCH YouTube (program videos): https://www.youtube.com/channel/UCSk_E-ZKqSClcas49Cnvxkw

• CCE ENYCH Facebook (program social media): https://www.facebook.com/CCEENYCHP/

• CCE ENYCH Instagram (program social media): https://www.instagram.com/cceenychp/?hl=en


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