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Home » Picking strawberries in November
WHAT'S GROWING ... Comments

Picking strawberries in November

UNH researchers have extended NH growing season for strawberries

PUBLISHED ON July 10, 2017

Researchers with the New Hampshire Agricultural Experiment Station at the University of New Hampshire have succeeded in quadrupling the length of the Granite State’s strawberry growing season as part of a multi-year research project that aims to benefit both growers and consumers. (Credit: Kaitlyn Orde/UNH)

DURHAM, N.H. — Researchers with the New Hampshire Agricultural Experiment Station at the University of New Hampshire have succeeded in quadrupling the length of the Granite State’s strawberry growing season as part of a multi-year research project that aims to benefit both growers and consumers.

New Hampshire’s strawberry season traditionally lasts only four to six weeks. However, researchers working on the multi-state TunnelBerries project were picking day-neutral strawberries in Durham last November. Last year, experiment station researchers harvested strawberries grown in low tunnels for 19 consecutive weeks from mid-July through the week of Thanksgiving. They also found that the low tunnels significantly increased the percentage of marketable fruit, from an average of about 70 percent to 83 percent.

Day-neutrals are a different plant-type than the traditional June-bearers most common in New Hampshire and have been shown to fruit continuously for four to six months in the region. In addition, day-neutrals fruit the same year they are planted, which is not the case with June-bearers. (Credit: Kaitlyn Orde/UNH)

Now in its second year, the TunnelBerries research project is being conducted at the UNH Woodman Horticultural Research Farm in Durham, a facility of the NH Agricultural Experiment Station. It is part of a larger, multi-state USDA-funded initiative to optimize protected growing environments for berry crops in the upper Midwest and Northeastern United States. UNH’s component is focused on improving berry quality and the role day-neutral varieties may play in extending the length of strawberry season in the Northeast.

“Most New Englanders look forward to strawberry season because regionally produced strawberries are delicious. They also are a very valuable early season crop for farmers throughout the region. Unfortunately, though, this season is very brief, usually only about four to six weeks each year, limiting the period in which our regional producers are able to meet consumer demand for the fresh fruit. A longer strawberry season is good for both grower and consumer,” said graduate student Kaitlyn Orde, who is working with experiment station researcher Becky Sideman on the project.

Sideman, an associate professor of plant biology and UNH Cooperative Extension professor and specialist in sustainable horticulture production, estimates the retail value of New Hampshire’s strawberry crops at about $1.85 million, which she says is a conservative estimate.

The UNH project consists of two parts. Researchers want to determine the yield and fruiting duration of day-neutral strawberry varieties. Day-neutrals are a different plant-type than the traditional June-bearers most common in New Hampshire; day-neutrals (or ever-bearing) have been shown to fruit continuously for four to six months in the region. In addition, day-neutrals fruit the same year they are planted, which is not the case with June-bearers.

“We are growing one day-neutral variety on three different mulches to determine if there are any differences in total production, production patterns, runner production, and fruit characteristics among the mulches,” Orde said. “We also are investigating the role plastic covered low-tunnels play in improving berry quality, and what the microenvironment is within low tunnels, especially late season. To do this, we are evaluating five different plastics for the low tunnels.”

Researchers in Maryland, Minnesota, North Carolina, and New York have conducted preliminary research on similar systems. There also are limited growers in the Northeast who already cultivate day-neutral varieties, and even fewer who have experimented with low-tunnels in combination with the strawberry crop. However, there are no yield estimates or material recommendations, such as mulch or low tunnel cover, for New Hampshire producers.

This material is based upon work supported by the NH Agricultural Experiment Station, through joint funding of the National Institute of Food and Agriculture, U.S. Department of Agriculture, under award number 1006928, and the state of New Hampshire. It also is funded through the USDA NIFA Specialty Crop Research Initiative under Award Number 2014-51181-22380 in collaboration with Eric Hanson (MSU), AJ Both (Rutgers), David Conner (UVM), Dennis Decoteau (Penn State), Kathleen Demchak (Penn State), Emily Hoover (UMN), Rufus Isaacs (MSU), Kathleen Kelley (Penn State), William Lamont (Penn State), Lois Levitan (Cornell), Richard Marini (Penn State), Marvin Pritts (Cornell), Annemiek Schiler (MSU) and Becky Sideman (UNH). Additional financial support was provided by the NH Vegetable & Berry Growers’ Association and UNH Cooperative Extension. For more information, visit https://www.tunnelberries.org.

Founded in 1887, the NH Agricultural Experiment Station at the UNH College of Life Sciences and Agriculture is UNH’s original research center and an elemental component of New Hampshire’s land-grant university heritage and mission. We steward federal and state funding, including support from the USDA National Institute of Food and Agriculture, to provide unbiased and objective research concerning diverse aspects of sustainable agriculture and foods, aquaculture, forest management, and related wildlife, natural resources and rural community topics. We maintain the Woodman and Kingman agronomy and horticultural research farms, the Macfarlane Research Greenhouses, the Fairchild Dairy Teaching and Research Center, and the Organic Dairy Research Farm. Additional properties also provide forage, forests and woodlands in direct support to research, teaching, and outreach.

The University of New Hampshire is a flagship research university that inspires innovation and transforms lives in our state, nation and world. More than 16,000 students from all 50 states and 71 countries engage with an award-winning faculty in top ranked programs in business, engineering, law, liberal arts and the sciences across more than 200 programs of study. UNH’s research portfolio includes partnerships with NASA, NOAA, NSF and NIH, receiving more than $100 million in competitive external funding every year to further explore and define the frontiers of land, sea and space.

—UNH College of Life Sciences and Agriculture

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