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Stephen L. Love and Asunta Thompson-Johns

Seed piece spacing is an important economic consideration in the production of potatoes (Solanum tuberosum L.). The optimum spacing varies with cultivar and intended market. A study was designed to determine the influence of seed piece spacing on yield, tuber size distribution, net returns, and stem and tuber density of three processing potato cultivars. Seed tubers of cultivars Russet Burbank, Frontier Russet, and Ranger Russet were planted 8, 15, 23, 31, 46, 61, 76, or 91 cm apart at two locations in 1988 and 1989. Total, marketable (U.S. No. 1), and midsize (226–452 g tubers) yield, tuber size distribution, net profits from a representative processing contract, and stem and tuber density (number per meters of row) were determined. All three cultivars achieved highest total yields at the narrowest (8 cm) spacing. Maximum marketable and midsize (226–452 g) yield occurred between 15 and 31 cm, depending on the cultivar. Size distribution shifted from a predominance of small tubers at narrow spacings to a predominance of large tubers at wide spacings, and the rate of shift was cultivar-dependent. `Russet Burbank' showed a broad range of optimal spacing for net returns, with a maximum in the range of 23 to 46 cm. Optima for `Frontier Russet' and `Ranger Russet' were between 15 and 46 cm. Of the four tuber measurements, midsize yield appeared to be best for determining optimum spacing. Marketable yield was also a useful measurement. All three cultivars gave maximum midsize yields at a stem density of 10.5 to 12.1 per meter of row and a tuber density of 23.9 to 24.9 per meter of row. Tuber density showed some promise as a predictor of optimum seed piece spacing for new cultivars.

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David Douches, Walter Pett, Diedrich Visser, Joseph Coombs, Kelly Zarka, Kimberly Felcher, Gurling Bothma, Johan Brink, Muffy Koch, and Hector Quemada

instances: Ceres in 2003–04 (weight of medium tubers) and Dendron in 2005–06 (weight of large tubers). Table 4. Results of 3 years of field trials to evaluate the yield, size distribution, specific gravity, and tuber quality of potato cultivars

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Samuel Y.C. Essah, Jorge A. Delgado, Merlin Dillon, and Richard Sparks

distribution and on tuber quality is not well documented. There remains a need for studies on the effect of different cover crops on potato total tuber yield and also on potato tuber size distribution and tuber quality. The goal of the present study was to

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E.B.G. Feibert, S.R. James, K.A. Rykbost, A.R. Mitchell, and C.C. Shock

Previously published research suggests that the yield and water-use efficiency of C-3 plants can be enhanced through foliar-applied methanol. Potatoes (Solanum tuberosum L. cv. Russet Burbank) grown in Oregon at Klamath Falls, Madras, and Ontario were subjected to repeated foliar methanol treatments during the 1993 season. Methanol was applied at 20%, 40%, and 80% concentration with Triton X-100 sticker-spreader at 0.1%, and methanol was applied at 20% and 40% without Triton X-100. Methanol had no effect on tuber yield, size distribution, grade, or specific gravity at any location. Tuber stem-end fry color showed no methanol response at the two locations where it was measured. Soil water potential (measured at Madras and Ontario) showed no difference in water-use efficiency between methanol-treated and nontreated potato plants.

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Richard O. Nyankanga, Ocen Modesto Olanya, Hans C. Wien, Ramzy El-Bedewy, John Karinga, and Peter S. Ojiambo

, vines were hand-cut and removed from the field. Tubers were hand-harvested and sorted into three categories: ware, seed, and rejects. Healthy, medium-sized tubers were selected and stored for 1 to 2 months in cold storage maintained at 5 °C before being

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S.B. Sterrett, G.S. Lee, M.R. Henninger, and M. Lentner

In `Atlantic' potato (Solanum tuberosum L.) the onset and development of internal heat necrosis (IHN) varied with planting date and location in 1989. Symptoms of IHN (first trace) took fewer days to appear in the later plantings in Virginia and New Jersey. However, the interval from first trace to offgrade was extended in the later plantings. Data from successive harvests in these two locations over the past 4 years were used to develop a two-stage model to predict first trace and offgrade by stepwise regression techniques. The predictive model for first trace included rainfall and variables calculated from a heat-sum model that reflected maximum and minimum air temperatures during tuber initiation and early enlargement. The addition of variables reflecting size distribution and rainfall events at first trace resulted in a strong predictive model for offgrade (R 2 = 0.98, Mallow's criterion = 2.97). These models indicate that onset and development of IHN are influenced by environmental stress during more than one stage of growth. A delay in the development of offgrade tubers would be expected in years with a cool, wet spring, fewer tubers >64 mm in diameter at first trace, and more rain events during the 10 days immediately after first trace.

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Etienne L. LeRiche, Gefu Wang-Pruski, and Valtcho D. Zheljazkov

Nutting, 1950 ; Zaehringer et al., 1969 ) and processing quality ( Arteca et al., 1980 ; Hughes and Swain, 1962b , Mohr et al., 1984 ). However, only a limited amount of research has been done to determine the distribution of elements within each tuber

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Zhanao Deng, Brent K. Harbaugh, and Natalia A. Peres

Leaves of ‘Cranberry Star’ are similar in size to that of many other cultivars. The largest leaf on plants grown in a 50% shaded greenhouse produced from an intact No. 1 tuber in an 11.4-cm pot averaged 23 cm long and 15 cm wide 8 weeks after planting

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Fernanda Souza Krupek, Christian T. Christensen, Charles E. Barrett, and Lincoln Zotarelli

adjusting seed piece spacing, no studies have been conducted on chipping potato cultivars for Florida. Understanding and predicting the effect of seed piece spacing on tuber size distribution, yield, physiological disorders, and economic performance will

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Zhanao Deng and Brent K. Harbaugh

height of 40 cm. The largest leaf on plants grown in a 45% shaded greenhouse produced from an intact No. 1 tuber in an 11.4-cm pot averaged 19 cm long and 12 cm wide 8 weeks after planting. Jumbo-sized (greater than 6.4 cm and less than 8.9 cm in diameter