• CALS student Emmanuel Brefo starts field trials for the Winter Pea research project in a Burlington, Vermont farm field.

  • CALS student Emmanuel Brefo's trials of winter pea growing vigorously during the season in Burlington, Vermont.

This page is a collaboration between the UVM Center for Sustainable Agriculture and Eric Bishop von Wettberg of the Plant & Soil Science Department.  We are glad to promote the use of dual-purpose winter pea varieties that aid in soil conservation and present economic opportunities for vegetable farmers.

The initial content and images on this page were developed by CALS student Emmanuel Brefo, and we look forward to expanding this content over time.

Soil erosion and nutrient run offs are long known to be the major threats to our food systems. Soil conservation efforts are important to manage the threats and one of the most widely used strategies is cover cropping also known as “living mulch”. Despite the ecological benefits of using “living mulch” to mitigate the risk of soil erosion, the practice is not incorporated in the annual production plan of many farms due to several challenges including lack of equipment, timing of planting and terminating, and expense of seed.  We hope new varieties that can be harvested as vegetables solve some of these challenges.

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Pisum Sativum (winter pea) is one of the few legumes that can overwinter in Vermont. Winter pea as a cover crop fixes atmospheric nitrogen into the soil through its symbiotic relationship with Rhizobia bacteria. Winter pea cover crop also break weed, disease, and insect cycles. Identifying which winter hardy pea varieties with the quality attributes that fit the food/feed market requirement to plant is often difficult for growers, hence a variety testing program is crucial to evaluate the hardiness and edible qualities of new improved varieties in the northeastern US given the bioregion's specific traits.

Our hope is that our test findings will help growers make informed choices on the best varieties for the region.  Over time, we hope to provide information on dual-use peas, which serve the ecological function of a winter cover crop, but can be harvested as vegetables (fresh pods, sprouts and microgreens).

Field Trials 2021-2022

id: a man kneeling down in a plowed field next to green grass and verdant trees, planting seeds

Emmanuel sowing seeds for the season's trial (October 1st 2021)

Plant Emergence

id: picture of smiling man with a winter hat and scarf in front of field with young plants growing

Conducting plant stand counts after emergence.

Winter Survival

id: farm field under a light cover of snow with plants visible through it

To determine the level of winter survival percentages of the different varieties, the crops are planted outdoors to overwinter..

Intercropping

id: grasses and round-leafed legumes growing together in rows in a farm field

An inter-cropping system of pea and triticale is used for the field trials. The triticale is planted in parallel rows to aid as bio-insulators and wind break to our primary pea crop.

 

For more information about winter peas or other tuberous legumes, contact Dr. Bishop von Wettberg via email or 802-656-9117. Interested in knowing more about the Center's work or seeking additional information?  Contact Extension via the short form on this page and one of our colleagues will help get you the resources you need.