11 results on '"R. R. Spear"'
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2. Vanguard Russet: A Fresh Market Potato Cultivar with Medium-Early Maturity and Long Dormancy
- Author
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M. I. Vales, D. C. Scheuring, J. W. Koym, D. G. Holm, S. Y. C. Essah, R. G. Wilson, J. K. Sidhu, R. G. Novy, J. L. Whitworth, J. C. Stark, R. R. Spear, V. Sathuvalli, C. C. Shock, B. A. Charlton, S. Yilma, N. R. Knowles, M. J. Pavek, C. R. Brown, D. A. Navarre, M. Feldman, C. M. Long, and J. C. Miller
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Plant Science ,Agronomy and Crop Science - Published
- 2022
- Full Text
- View/download PDF
3. Galena Russet: a Long Dormancy, Dual-Purpose Potato Cultivar Exhibiting Low Asparagine, Cold-Sweetening Resistance, and Enhanced Protein Content
- Author
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Vidyasagar Sathuvalli, J. C. Stark, Nora Olsen, S. Yilma, T. L. Brandt, Yi Wang, Jonathan L. Whitworth, M. J. Pavek, Lisa O. Knowles, N. R. Knowles, R. R. Spear, B. A. Charlton, R. G. Novy, and Michael K. Thornton
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0106 biological sciences ,chemistry.chemical_classification ,Dual purpose ,Chemistry ,04 agricultural and veterinary sciences ,Plant Science ,engineering.material ,01 natural sciences ,Sweetening ,Reducing sugar ,Protein content ,Horticulture ,Galena ,040103 agronomy & agriculture ,engineering ,0401 agriculture, forestry, and fisheries ,Dormancy ,Asparagine ,Cultivar ,Agronomy and Crop Science ,010606 plant biology & botany - Abstract
Galena Russet is a potato variety notable for high marketable yields resulting from greater resistance to external tuber defects compared to industry standard Russet Burbank. Galena Russet exhibits long dormancy, cold-sweetening resistance, and higher protein content than standard varieties. In early-season trials conducted over 3 years in the Pacific Northwest, Galena Russet produced total and U.S. No. 1 yields similar to standard varieties. During 4 years of full-season trials in five western states, Galena Russet produced greater total and U.S. No. 1 yields than Russet Burbank and Ranger Russet in most locations, with specific gravities greater than Ranger Russet on average. Galena Russet produced light-colored fries out of storage with temperatures as low as 4.4 °C, demonstrating its cold-sweetening resistance and low reducing sugar concentrations. Moreover, the asparagine concentration of Galena Russet tubers was 42 and 36% lower than Russet Burbank and Ranger Russet tubers, respectively, following 2 months of storage. Low reducing sugar and asparagine concentrations may predict low acrylamide formation during processing. Galena Russet has shown greater resistance to PVY than Russet Burbank and Ranger Russet.
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- 2021
- Full Text
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4. La Belle Russet: an Early Maturing, Dual-Purpose Variety Having a High Percentage of Marketable Yield, Long Tuber Dormancy, and a Reduced Incidence of Sugar Ends
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R. G. Novy, J. L. Whitworth, J. C. Stark, R. R. Spear, B. L. Schneider, M. J. Pavek, N. R. Knowles, L. O. Knowles, B. A. Charlton, V. Sathuvalli, S. Yilma, C. R. Brown, T. L. Brandt, Yi Wang, M. Thornton, and N. Olsen
- Subjects
Plant Science ,Agronomy and Crop Science - Published
- 2021
- Full Text
- View/download PDF
5. Improving Land Use Efficiency and Grower Revenue by Reducing Potato Row Width
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R. R. Spear, M. J. Pavek, B. J. Weddell, and Zach J. Holden
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0106 biological sciences ,Polynomial regression ,Land use ,Industry standard ,Economic return ,04 agricultural and veterinary sciences ,Plant Science ,Adjusted gross income ,01 natural sciences ,Agronomy ,Yield (wine) ,040103 agronomy & agriculture ,0401 agriculture, forestry, and fisheries ,Revenue ,Agronomy and Crop Science ,Row ,010606 plant biology & botany ,Mathematics - Abstract
The standard row width for potato production in the Columbia Basin of Washington and Oregon is 86 cm (34 in.), but the reasons for this are unclear. The goal of this research was to identify a row width that maximizes potato grower revenue by optimizing land use efficiency. A 2012 pilot study conducted in central WA with four potato varieties (Alturas, Ranger Russet (R.), R. Burbank, and Umatilla R.) and four row width treatments (76, 81, 86, and 91 cm (30, 32, 34, and 36 in.)) indicated that row widths
- Published
- 2018
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6. Sensory Evaluation of Eleven Baked Russet-type Potato Varieties and Clones
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M. J. Pavek, B. J. Weddell, Carolyn F. Ross, Zach J. Holden, and R. R. Spear
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0106 biological sciences ,biology ,Flesh ,04 agricultural and veterinary sciences ,Plant Science ,biology.organism_classification ,040401 food science ,01 natural sciences ,0404 agricultural biotechnology ,Food science ,Aftertaste ,Agronomy and Crop Science ,Flavor ,Aroma ,010606 plant biology & botany ,Mathematics - Abstract
Six hundred untrained panelists evaluated the baked sensory appeal of up to six varieties, three clones, and two Russet Norkotah (RN) strains. Panelists consumed small samples of plain baked potato and recorded their preference for aroma, flavor, texture, aftertaste and acceptance. After viewing photographs of two unidentified baked potatoes (RN and Classic Russet) sliced in half, they selected the photo that best described their visual preference of a baked potato; each potato was stored at 6.7 °C for 6 months prior to cooking. Eighty percent of panelists shown the photographs of the unidentified baked potatoes preferred the visual appearance of Classic R (white/cream - colored flesh) to that of RN (yellow/Gy - colored flesh). Mean scores for all culinary traits averaged > 5.0 on the 1-9 scale, which indicated that panelists generally liked the culinary attributes of all trialed varieties, however, panelists were able to detect differences among varieties. Flavor and texture were addressed in written comments from panelists more frequently than other attributes. On a texture scale of 1–7, with 1 = moist/dense and 7 = dry/crumbly, most panelists preferred baked potatoes with a texture of 3 (creamy/smooth).
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- 2017
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7. Fresh Market Evaluation of Six Russet-Type Potato Varieties and Four Russet Norkotah Strains
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M. J. Pavek, Zach J. Holden, and R. R. Spear
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0106 biological sciences ,Horticulture ,Botany ,040103 agronomy & agriculture ,Fresh market ,0401 agriculture, forestry, and fisheries ,Sowing ,04 agricultural and veterinary sciences ,Plant Science ,Biology ,01 natural sciences ,Agronomy and Crop Science ,010606 plant biology & botany - Abstract
In 2016, Russet Norkotah was the second most widely grown potato variety in the US; however, recent research has identified alternatives with excellent production economics. During 2011–2013, fresh market variety research was conducted in the Columbia Basin of central Washington, a long-season production region. Russet Norkotah was compared to five varieties–Classic Russet, Mountain Gem Russet, Russet Burbank, Targhee Russet, and Teton Russet–and four sub-clonal strains–CO-3, CO-8, TX-278, and TX-296–derived from Russet Norkotah. Each variety was evaluated for early- (104 days between planting and vine kill) and late- (150 days between planting and vine kill) harvest tuber size profile, grade, and yield, grower economic value, susceptibility to blackspot bruise and shatter bruise, emergence, stem and at-harvest tuber numbers, tuber length-to-width ratios, and quality. When harvested early, Classic Russet and Mountain Gem Russet produced 30% and 15% more gross revenue than Russet Norkotah, respectively. All other varieties and Russet Norkotah strains except CO-3 produced as much early-harvest gross revenue as Russet Norkotah. CO-3 early-harvest revenue was close to 50% lower than that of Russet Norkotah. All varieties and Russet Norkotah strains produced significantly greater late-harvest yields and gross returns than Russet Norkotah. Late-harvest gross revenue for Targhee Russet and Mountain Gem Russet was 38% and 34% higher than Russet Norkotah, respectively. Classic Russet, Mountain Gem Russet, Targhee Russet, and Teton Russet had significantly more shatter bruise following the late harvest than Russet Norkotah and all Russet Norkotah strains. Russet Burbank was among the most susceptible to blackspot and Targhee Russet the least, with 32% and 2.1%, respectively. If bruising is mitigated, Mountain Gem Russet, Classic Russet, and Teton Russet may be suitable alternatives to Russet Norkotah and Russet Norkotah strains for both early and late harvests.
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- 2017
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8. Targhee Russet: A High Yielding, Dual Purpose Potato Variety with High Protein and Vitamin C Content and Resistance to Tuber Soft Rot
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Nora Olsen, M. J. Pavek, Jeffrey C. Stark, Jonathan L. Whitworth, S. Yilma, Michael K. Thornton, Richard G. Novy, R. R. Spear, N. R. Knowles, Vidyasagar Sathuvalli, T. L. Brandt, B. A. Charlton, and Charles R. Brown
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0106 biological sciences ,Dual purpose ,Potato leafroll virus ,Vitamin C ,Common scab ,High protein ,food and beverages ,04 agricultural and veterinary sciences ,Plant Science ,Biology ,biology.organism_classification ,01 natural sciences ,Bruise ,Agronomy ,040103 agronomy & agriculture ,medicine ,0401 agriculture, forestry, and fisheries ,Verticillium wilt ,medicine.symptom ,Agronomy and Crop Science ,High potential ,010606 plant biology & botany - Abstract
Targhee Russet is a darker-skinned russet potato variety that has shown higher total and marketable yields than Russet Burbank in most yield trials conducted in the western United States. A major strength of Targhee Russet is resistance to tuber soft rot, and it also has moderate resistance to common scab, Verticillium wilt, and net necrosis associated with Potato leafroll virus. Targhee Russet also has exhibited resistance to hollow heart and blackspot bruise. Analyses have shown Targhee Russet to have significantly higher tuber protein and Vitamin C content than Russet Burbank and Ranger Russet. It produces lighter colored fries out of storage than standard processing varieties, indicating its high potential for the production of premium quality frozen and fresh-cut fries. High merit scores for fresh use are also indicative of it having excellent potential as a dual-purpose russet variety, suitable for both processing and fresh-pack operations.
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- 2016
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9. Mountain Gem Russet: a Potato Variety with High Early and Full Season Yield Potential and Excellent Fresh Market and Early Processing Characteristics
- Author
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Richard G. Novy, T. L. Brandt, R. R. Spear, Charles R. Brown, S. Yilma, Jonathan L. Whitworth, B. A. Charlton, N. R. Knowles, Nora Olsen, Jeffrey C. Stark, Michael K. Thornton, Vidyasagar Sathuvalli, and M. J. Pavek
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0106 biological sciences ,04 agricultural and veterinary sciences ,Plant Science ,Biology ,01 natural sciences ,040501 horticulture ,Protein content ,Horticulture ,Yield (wine) ,Botany ,Fresh market ,Blight ,Cultivar ,0405 other agricultural sciences ,Agronomy and Crop Science ,010606 plant biology & botany - Abstract
Mountain Gem Russet is a potato variety notable for having both high early and full-season yields of oblong-long, medium-russeted tubers with higher protein content than those of standard potato varieties. Mountain Gem Russet has greater resistance to soft rot, tuber late blight, growth cracks and second growth than Russet Burbank. Mountain Gem Russet produced greater total and U.S. No. 1 yields than Ranger Russet and Russet Norkotah in early-season trials conducted in Idaho, Oregon and Washington over a 3 year period. In full-season trials conducted in five western states over a 4 year period, average total and U.S. No. 1 yields for Mountain Gem Russet were almost always higher than Ranger Russet and Russet Burbank, with specific gravities averaging between these two standard cultivars. It maintains acceptable reducing sugar concentrations and fry quality when stored at 8.9 °C and has displayed a high level of fry color uniformity from tuber stem to bud end providing good potential for early processing. High fresh merit ratings and taste panel sensory scores comparable to Russet Burbank indicate good fresh market potential for Mountain Gem Russet. It was released in 2015 by the USDA-ARS and the Agricultural Experiment Stations of Idaho, Oregon, and Washington, and is a product of the Pacific Northwest Potato Variety (Tri-State) Development Program.
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- 2015
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10. Teton Russet: An Early-Maturing, Dual-Purpose Potato Cultivar Having Higher Protein and Vitamin C Content, Low Asparagine, and Resistances to Common Scab and Fusarium Dry Rot
- Author
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Nora Olsen, Jeffrey C. Stark, T. L. Brandt, Charles R. Brown, B. A. Charlton, S. Yilma, Richard G. Novy, M. J. Pavek, R. R. Spear, Jonathan L. Whitworth, N. R. Knowles, and Michael K. Thornton
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Dual purpose ,Agronomy ,Chemistry ,Common scab ,Plant Science ,Fusarium dry rot ,Cultivar ,Agronomy and Crop Science - Abstract
Teton Russet is an early-maturing, medium-russeted, potato cultivar with high merit for both fresh-pack and processing. In early harvest trials in the Pacific Northwest, Teton Russet had total yields similar to Russet Norkotah, and higher than Ranger Russet and Russet Burbank. Marketable yield of Teton Russet in the early harvest trials was also comparable to or higher than Russet Norkotah in Washington and Oregon, and higher than Ranger Russet and Russet Burbank at these sites, as well as in Idaho. In full-season trials, while total yield of the earlier-maturing Teton Russet tended to be lower than Ranger Russet and Russet Burbank, marketable yield was generally higher than Russet Burbank across the majority of sites due to its higher percentage of U.S. No. 1 tubers. Teton Russet is suitable for processing, with acceptable fry color following up to 8 months of storage at 8.9 °C. Uniformity of fry color was also very consistent. Teton Russet has shown lower levels of the amino acid asparagine relative to Ranger Russet and Russet Burbank which may contribute to lower acrylamide levels in French fries and other processed potato products. Teton Russet is notable for having resistance to common scab (Streptomyces spp.) and Fusarium dry rot, and is moderately resistant to tuber net necrosis. Analyses have also shown Teton Russet to have significantly higher protein levels than Russet Norkotah, Ranger Russet, and Russet Burbank, as well as higher vitamin C content than Russet Norkotah and Russet Burbank. Teton Russet was released in 2011 by the USDA-ARS and the Agricultural Experiment Stations of Idaho, Oregon, and Washington, and is a product of the Pacific Northwest Potato Variety (Tri-State) Development Program.
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- 2013
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11. Critical States of Mixtures and Equations of State
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Kwang-Chu Chao, R. L. Robinson, and R. R. Spear
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State function ,Equation of state ,Reduced properties ,Materials science ,General Engineering ,Mathematical physics - Published
- 1969
- Full Text
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