Dec 1, 2016

Study: How crop load density affects juice, cider quality

Hard cider, an alcoholic beverage produced from fermented apple juice or apple juice concentrate, is gaining popularity among consumers. Domestic cider consumption increased more than 850 percent in the last 5 years in the U.S., with more than 550 cider producers in the country. The authors of a study in HortScience say that more information about how orchard management decisions impact cider quality can help orchard managers improve cider they produce from culinary apples.

Cornell University’s Gregory Peck, the study’s corresponding author, along with scientists Megan McGuire, Thomas Boudreau IV, and Amanda Stewart from Virginia Polytechnic Institute and State University, carried out field experiments to assess the impact of three different crop load densities on apple fruit and cider quality. Treatments were conducted in a 14-year-old ‘York Imperial’/’M.9’ orchard in Winchester, Virginia. Peck explained that ‘York’ apples are primarily used for processing into products such as juice, vinegar, and applesauce. “The vast majority of cider produced in the United States is made from apple cultivars that were originally planted for fresh or processing markets,” he said, noting that culinary apples lack some of the fruit quality characteristics favored by cider producers.

For the experiments, ‘York’ apple trees were hand-thinned to low (two apples per cm² branch cross-sectional area, or BCSA), medium (four apples per BCSA), and high (six apples per BCSA) crop loads.

At harvest, total polyphenol content did not differ in juice made from fruit grown in the three treatments. After fermentation, however, the medium crop load had 27 percent and the high crop load had 37 percent greater total polyphenol content than the low crop load.

Yeast assimilable nitrogen (YAN) concentration in juice made from fruit from the low crop load treatment was 18 percent and 22 percent greater than the medium and high crop load, respectively. YAN concentrations in juice from the medium and high crop load treatments were similar.

“Our study suggests that apple juice and cider quality can be altered by crop load management,” the authors said. “Management strategies for chemical thinning should take into account the resulting fruit quality, especially YAN concentration in juice pre-fermentation and total polyphenol concentration and total alcohol in fermented cider.”

The authors recommended that cider makers should be “especially aware” of the potential for YAN deficiency in fruit from orchards with a high crop load. “YAN deficiency can be rectified through the addition of commercially available YAN supplements when warranted,” they added.

Source: American Society for Horticultural Science