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Matthew A. Cutulle, H. Tyler Campbell, Monica Farfan and Phillip A. Wadl

Sweetpotato is an important specialty crop in the United States ( Wadl et al., 2018 ). After many years of decline beginning in the 1950s, per-capita U.S. consumption of sweetpotatoes has shown a dramatic increase during the past 10 years, and

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S.B. Phillips, J.G. Warren and G.L. Mullins

1 To whom reprint requests should be addressed; e-mail stevep@vt.edu . We thank the Virginia Sweetpotato Board for the financial support necessary to conduct this work.

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Lewis W. Jett and Timothy P. Talbot

A cultural practice that can modify and conserve the soil environment is needed in sweetpotato [Ipomoea batatas (L.) Lam.] production. The objective of this research was to evaluate conventional and conservation tillage of sweetpotato with four cover crop species (fallow, ryegrass, rye, and wheat). The cover crops were seeded in late Oct. 1995, and the sweetpotato transplants (`Beauregard') were transplanted at two dates the following spring (May and June). Conservation tillage significantly lowered soil temperature (10 cm depth) during storage root initiation and development. Moreover, each cover crop significantly reduced weed emergence and soil erosion. The ryegrass conservation tillage treatment significantly increased marketable yield of sweetpotato in the first planting date, while rye and wheat performed equally well in the second planting date. In the second planting date, white grub (Phyllophaga ephilida Say) injury to storage roots was significantly higher in the conservation tillage treatments. However, conservation tillage seems to be a viable alternative to the conventional method of sweetpotato production.

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G.R. Duran, P.C. Coggins and J.A. Wilbourn

Nationally, about 97,900 acres of sweetpotatoes (Ipomoea batatas) were planted for 2001 with a yield of 156 cwt. Many of the sweetpotatoes are left in the field as unmarketable culls. A juicing technique used to produce a value-added product from the culls would be valuable to the sweetpotato farmer and the industry as a whole. This process would enable the farmers to turn an unmarketable product into a potentially profitable juice product. The research objective was to determine the usable yields of sweetpotato culls by extracting the juice. This would provide a value-added juice product for sweetpotato farmers. Juice would be easily transported and stored. Sweetpotato culls were collected, washed, and dried. Samples were chopped, weighed and processed with an automatic juice extractor (Juiceman Jr., Mount Prospect, Ill.). The extracted juice and remaining pulp were removed and weighed. Percent juice, pulp, and loss were calculated on a weight basis. Results showed that when processed with a grinding/centrifugal type juice extractor, an average of 53.6% of the initial weight from sweetpotato culls can be extracted as juice. Also, as the initial weight of the culls increased, the percent juice extracted increased. The combined solids collected from the extracted pulp and the pulp remaining after equipment disassembly was on average 42.66% of the initial weight. The unsalvageable percent of juice and pulp was on average 3.93%. These results suggest that sweetpotato culls yield about half of their original weight as juice. Juice extraction may be a viable option for processing non-market grade sweetpotato culls. Sweetpotato juice may be consumed as a beverage or combined with other juices to form a variety of juice blends.

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Nicholas A. George, Kenneth V. Pecota, Blake D. Bowen, Jonathan R. Schultheis and G. Craig Yencho

Sweetpotato is one of the world's most important and widely grown starchy crops, with annual production in over 110 countries currently estimated to total 114 million tonnes ( Food and Agriculture Organization of the United Nations, 2010 ). In

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Susan L. Barkley, Sushila Chaudhari, Jonathan R. Schultheis, Katherine M. Jennings, Stephen G. Bullen and David W. Monks

Sweetpotato is an important crop worldwide, valued at over $9.4 billion ( Food and Agriculture Organization of the United Nations, 2012 ). In the United States, sweetpotato production is valued at $698 million in gross farm value [ U.S. Department

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Jun Tang, Kang-Di Hu, Lan-Ying Hu, Yan-Hong Li, Yong-Sheng Liu and Hua Zhang

Sweetpotato [ Ipomoea batatas (L.) Lam] is grown in regions ranging from the tropics to the subtropics and ranks sixth or seventh among the most important food crops in the world ( Scott, 1992 ). Fleshy storage roots of sweetpotato are used as a

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Joshua K. Craver, Chad T. Miller, Kimberly A. Williams and Nora M. Bello

Intumescences are a physiological disorder that develops sporadically on the leaf tissue of many plant species, including some varieties of tomato ( Solanum lycopersicum ‘Maxifort’; Rud, 2009 ), sweetpotato ( Wetzstein and Frett, 1984 ), and

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Joel Felix, Clinton C. Shock, Joey Ishida, Erik B.G. Feibert and Lamont D. Saunders

Sweetpotato is a warm-season root crop that is widely grown across the world under a wide range of environments and cultural practices. In the United States, commercial sweetpotato production is predominantly in the southeastern states and in

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Jesse R. Quarrels and Paul G. Thompson

An experiment was conducted to determine the rate and frequency of irrigation needed for optimum yield in sweetpotato (Ipomoea batatas (L.)Lam). A line source irrigation system was used to provide continuously increasing amounts of water at each irrigation. The physiological responses of sweetpotato to water application were measured. There was an increase in leaf water potential with increasing rates of irrigation. Leaf diffusive resistance decreased as total water rate increased to 76% of pan evaporation (Epan) and then increased with higher rates of irrigation. Marketable yields increased as total water rate increased to 76% of Epan and then decreased rapidly with higher irrigation rates. Water relations measurements indicated that reduction in yield with higher amounts of water application was due to low soil oxygen content.