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Charles F. Forney

There is an increased interest in extending the market life of fresh cranberries as a result of the growing demand for fresh, healthful fruits. To supply this growing demand, fruit quality must be maintained and postharvest losses reduced during

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Teryl R. Roper, John Klueh, and Marianna Hagidimitriou

1 Associate Professor. 2 Former Assistant Researcher. 3 Former Graduate Research Assistant. We thank DuBay Cranberries for allowing this work to proceed in their marsh. This research was supported by the Wisconsin Cranberry Board. The cost of

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Michelle R. Botelho and Justine E. Vanden Heuvel

This research was supported by USDA/CSREES, the Massachusetts Agr. Expt. Sta. Project MAS00875, and the Cranberry Experiment Station. We gratefully acknowledge the statistical assistance of Wesley Autio and the technical assistance of Amber

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Richard G. Novy and Nicholi Vorsa

1 To whom reprint requests should be addressed. New Jersey Agricultural Expt. Station publication D-12163-7-94 supported by state funds, the U.S. Hatch Act, CSRS grant 93-34155-8382, and Ocean Spray Cranberries. We thank Carin Hollis for her

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J. R. Davenport

Foliar feeding of crop plants is an increasingly popular practice. The use of foliar nutrients relies on the ability of the plant to sorb nutrients through the leaves. Cranberries (Vaccinium macrocarpon Ait.) are known to have a waxy cuticle on the leaf surface which may impede nutrient uptake, leaving only the lower leaf surface for effective uptake. This study was undertaken to determine the extent of foliar nutrient uptake by cranberries using rubidium as a tracer. Rubidium was chosen for its similarity to potassium in plant uptake. In replicated plots, cranberries were sprayed with rubidium at the rate recommended for foliar potassium at three different growth stages and three different times of day. Washed and unwashed leaves were analyzed one day, one week, and one month after rubidium applications. Stem, soil, and root material was analyzed for rubidium at the one week and one month sample times. Results will be discussed with reference to uptake and movement of foliar applied nutrients in cranberries.

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Bernadine C. Strik and Arthur Poole

1 Assistant Professor. 2 Horticultural Extension Agent. The authors gratefully acknowledge the technical assistance of Dawna Jackson and-the support of the Oregon Cranberry Growers' Assn. The cost of publishing this paper was defrayed in

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Eric L. Zeldin, Thomas P. Jury, Rodney A. Serres, and Brent H. McCown

1 Researcher. 2 Graduate student. 3 Postdoctoral fellow; current address: Ocean Spray Cranberries, Inc., 1 Ocean Spray Dr., Lakeville-Middleboro, MA, 02349. 4 Gottschalk distinguished professor; e-mail bhmccown@facstaff.wisc.edu . The Wisconsin

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Carolyn DeMoranville

Commercial cranberry (Vaccinium macrocarpon Ait.) soils are high in iron and calcium and have low pH. This soil chemistry causes conditions where phosphorus is tightly bound and is, to a large extent, unavailable to the cranberry plants. In theory, P forms that directly enter the plant (foliar), or that do not quickly dissolve to become rapidly immobilized (organic, slow-release, other insoluble forms) could be more efficient for cranberry production. To test this hypothesis, two separate sets of field plots, one comparing 19 kg P/ha from sole P sources (all received 22 kg·ha–1 each N and K2O as ammonium sulfate and potassium sulfate) and the other comparing “complete” N–P–K fertilizers containing P, were established at six locations on three cranberry cultivars. Experiment #1 showed that, over all locations, there were no differences in mean yield for plots fertilized with triple super phosphate (current practice), foliar, or rock phosphate. However, fruit rot levels differed by treatment. In Experiment #2, organic forms (except bone meal) gave the lowest yields, while rock phosphate plots had the greatest yields. These field studies indicated that, while some organic P sources may not be suitable for cranberry production, low-leaching P forms such as bone meal and rock phosphate were as effective for cranberry production as the more-soluble triple super phosphate.

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Lisa Wasko DeVetter, Rebecca Harbut, and Jed Colquhoun

Cranberry is a perennial vine native to northeastern continental America ( Eck, 1990 ). Vertical stems, known as uprights, develop terminal buds that may be mixed or vegetative. Mixed buds contain flower initials that overwinter and produce fruit

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Hilary A. Sandler

cooperation of cranberry growers B. Handy, K. Mann, M. Mann, D. Ross, E. Silva, and R. Thatcher is gratefully acknowledged. Reference to a proprietary product does not imply approval or recommendation of the product by the Univ. of Massachusetts to the