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The postharvest program identifies new potato clones that have superior postharvest and culinary attributes for the Pacific Northwest potato industry. We evaluate the storability and processing qualities of clones produced in early and late season management trials from Washington, Oregon, and Idaho at the postharvest storage and laboratory facilities in Pullman.

As a service to Washington potato growers, the Potato Research Group undertakes annual Commercial Seed Lot Evaluations in order to ensure a high-quality, disease-free industry. Results of annual professional evaluations of commercial potato seed lots are presented here as well as at the annual WSU Potato Field Day each June.

Each year, we publish variety-trial results in user-friendly graphs, figures, and charts. This publication is available as a printed volume (the Potato Cultivar Yield and Postharvest Quality Evaluations yearbook) as well as an electronic publication(accessed using Adobe Acrobat). An economic analysis is conducted on all clones and cultivars for both the fresh and process markets, with the exception of the red and specialty clones. Cultivars are ranked according to their overall performance which takes into account economics, yields, tuber-size profiles, tuber quality and many postharvest attributes.

Maybe Not, Research Says

by Kathy Barnard, CAHNRS Marketing & News Services

While extra applications of nitrogen and other fertilizers might increase the overall yield in a potato field, it may not result in the optimal economic yield, according to research by WSU Extension horticulturist Mark Pavek and former graduate studentChris Hiles.

Working with two newly released cultivars called Alturas and Premier at the WSU potato research unit in Othello, Hiles analyzed the impact of different nitrogen applications on crop yields. He also looked at overall economic yields as well. What he found may alter how growers approach adding inputs.

“Total yield doesn’t necessarily equate with the best economic yield,” he told those attending the WSU Potato Research Field Day in late June.

Especially given the increasingly high costs of petroleum-based fertilizers, optimal economic yield for the Premier cultivar actually occurs at approximately 87 percent of what is considered normal for growing Russet Burbank and maximum economic yield occurs at 96 percent of the normal rate for Russet Burbank in Alturas.

In other words, the net profit of a slightly smaller crop grown with fewer inputs is higher than a larger crop grown with inputs generally prescribed.

“There really is no reason to go above the 100 percent of normal rate,” Hiles said, “and in fact, the economics are better at lower levels.”

This article originally appeared in the July 22, 2009 edition of On Solid Ground.

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