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Otho S. Wells and Michael R. Sciabarrasi

High tunnels (unheated walk-in structures) are widely utilized in Europe, Asia, and the Middle East for early vegetable production. There are relatively few high tunnels used for vegetable production in the U.S. In a 2-year study, determinate tomatoes matured up to 32 days earlier than the same cultivars under standard field culture. Earliness was gained through 16 days earlier planting and 16 days earlier maturity than in the field. In tunnels, when ground grown, yield was 7.4 kg m-1; and when grown with a basketweave trellis, yield was 6.8 kg m-1. Even though these yields (for a 30-day period) were less than the yields from the field, the earlier harvest provides an extra marketing opportunity at premium prices. Under current production and marketing conditions in New Hampshire, at a conservative average selling price of $1.60/lb, the net return is $0.71/1b. By using relatively low cost tunnels, growers are able to economically extend their growing and marketing season without a high capital outlay.

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Iqrar Ahmad Khan, Ahmad Sattar Khan, Ishtiaq Ahmad Rajwana, Asif Ali Khan, Muhammad Abubakkar Azmat, and Syed Ali Raza

in mango growing areas with extended harvesting season. Origin Each of the genotype was identified as a chance seedling from orchards of different mango producing districts (Rahim Yar Khan-RYK, Khanewal-KHW, and Multan-MLT) of Punjab–Pakistan. Nine

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Hans Spalholz, Mary Jo Kelly, and Marvin Pritts

The use of high tunnels is a technology that can be implemented just about anywhere for a modest cost, and can be used to bring crops on earlier or extend them later in the season. Raspberries are a high value crop that, in season, sell for more than $3.00/lb. In the middle of winter, raspberries can sell for more than $10.00/lb. Our goal was to produce raspberries in October and November, after the field season ends from frost and rain, and when the selling price of raspberries doubles. Our project examined primocane-fruiting varieties and methods of managing plants to delay their production beyond the normal late August-September season. The first part of the study was to monitor the growth and productivity of several late varieties that typically fruit too late for the New York climate. One selection (NY01.64) and one cultivar (Josephine) appeared very promising for high tunnel production. The second set of treatments manipulated `Heritage' so that it fruits later than the normal September season. The five treatments were an unmanipulated control, applying straw over plots in late February at the rate of 6 tons/acre after a period of cold weather, mowing canes to the ground in early June shortly after they emerge, pinching primocanes (removing the top 4–6 inches) when they reach a height of about 2½ ft, and pinching when canes were 3½ ft tall. Each of these 4 treatments delayed flowering and shifted production to later in the season. The late pinching treatment appeared to provide the best yield curve under the high tunnel.

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Bernadine C. Strik and Ellen Thompson

potential for extending the fresh market production season for blackberries. Literature Cited Carter, P.M. Clark, J.R. Drake Particka, C. Yazzetti Crowne, D. 2006 Chilling response of Arkansas blackberry cultivars J. Amer. Pom. Soc. 60 187 197 Clark, J

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Janel L. Ohletz and J. Brent Loy

adapted to early-season culture. However, beginning in the mid-1970s, improved cultural techniques using different plastic mulches and rowcovers provided technologies for extending the growing season and increasing melon yields in northern latitudes

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Justine E. Vanden Heuvel and Kimberly Lewers

Consumers, grocers, and distributors all want a year-round supply of fresh, high-quality berries. Repeat-fruiting cultivars are being developed as a tool to meet that demand by extending the growing season for small fruit crops. To develop markets

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Ellen Thompson, Bernadine C. Strik, Chad E. Finn, Yanyun Zhao, and John R. Clark

been reported using artificial chilling and forcing in greenhouses ( Bal and Meesters, 1995 ). Use of pruning techniques and application of chemicals to stimulate budbreak and flowering of floricane-fruiting blackberries to extend the fruiting season is

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Jim Hancock and David Simpson

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Marvin Pritts

over traditional summer-fruiting, floricane raspberries. Most notably, they provide an opportunity to extend the season from late summer into fall. Whereas the summer raspberry harvest lasts ≈6 weeks, fall fruiting can add an additional 6 weeks or

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Vincent M. Russo and James Shrefler

was extended to provide bunching onions in most months. The efficacy of the hoop house to extend the growing season appears to be less; the result of the minimal control over climate. Time until most marketable size plants were produced far exceeded