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Ryan C. Graebner, Hsuan Chen, Ryan N. Contreras, Kathleen G. Haynes, and Vidyasagar Sathuvalli

is unreduced (2n). In North American wild potato species, most diploids are 1EBN, most tetraploids are 2EBN, and all hexaploids are 4EBN; however, in South American wild potato species, most diploids are 2EBN, most tetraploids are 4EBN, and all

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André Pereira and Nilson Villa Nova

temperature, and available soil water content ( Coelho and Dale, 1980 ). Potato yield improvements can be obtained by increasing the net daily photosynthetically radiation ( PAR ) through higher solar irradiance or longer photoperiod ( Stuttle et al., 1996

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Kelly A. Zarka, Ria Greyling, Inge Gazendam, Dean Olefse, Kimberly Felcher, Gurling Bothma, Johan Brink, Hector Quemada, and David S. Douches

Potato tuber moth is a serious pest of potatoes in South Africa, causing losses as much as $5.4 million per annum to the South African potato industry ( Visser and Schoeman, 2004 ). Larval mining on the plant results in the loss of leaf tissue

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Michael D. Orzolek and Terry W. Simpson

Acreage of white potato production in Pennsylvania has steadily declined in the past 20 years, from ≈25,000 acres in 1976 to 18,000 acres in 1996. This decline in acreage has occurred mainly with potatoes used for chips, with a much smaller acreage loss for tablestock potatoes. The most common tablestock varieties on the market are round white or long russet varieties, which have been around for 30 to 50 years. However, the 90's consumer is more perceptive and creative with food choices, such that color, texture, and taste have become important characteristics in choosing new food items. Specialty new potatoes represent a relatively unexplored market with excellent potential for sales expansion in the fresh market and tablestock industry. Today's consumers are demanding more variety with respect to virtually all produce commodities and potatoes are no exception. Consumers demand different size, color, and taste of fresh vegetables, including potatoes. New specialty potato varieties (Yukon Gold is an example) are currently in demand by restaurants and some retail markets, and it appears that relatively high returns are possible with these specialty potatoes. Twenty-nine red, buff, or blue-skinned and white-, yellow-, purple-, or red-fl eshed potato varieties were planted in a replicated study at the Hort Research Farm, Rock Springs, Pa., in 1996. Yield and quality characteristics of these varieties will be presented along with some consumer acceptance/evaluation data collected from a local supermarket.

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Simone da Costa Mello, Francis J. Pierce, Rachel Tonhati, Guilherme Silva Almeida, Durval Dourado Neto, and Kiran Pavuluri

Polyhalite is a naturally occurring potassium, calcium, magnesium sulfate mineral with a chemical formula K 2 Ca 2 Mg(SO 4 ) 4 ·2(H 2 O) corresponding to 13.0% K, 13.3% Ca, 4.0% Mg, and 21.3% S. Many horticultural crops including potatoes ( Solanum

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Eric H. Simonne and Chad M. Hutchinson

Best management practices (BMPs) for vegetable crops are under development nationwide and in Florida. One goal of the Florida BMP program is to minimize the possible movement of nitrate-nitrogen from potato (Solanum tuberosum) production to surface water in the St. Johns River watershed without negatively impacting potato yields or quality. Current fertilizer BMPs developed for the area focus on fertilizer rate. Controlled-release fertilizers (CRF) have long been a part of nutrient management in greenhouse and nursery crops. However, CRFs have been seldom used in field-vegetable production because of their cost and release characteristics. Nutrient release curves for CRFs are not available for the soil moisture and temperature conditions prevailing in the seepage-irrigated soils of northern Florida. Controlled-leaching studies (pot-in-pot) in 2000 and 2001 have shown that plant-available nitrogen (N) was significantly higher early in the season from ammonium nitrate, calcium nitrate and urea compared to selected CRFs. However, N release from off-the-shelf and experimental CRFs was too slow, resulting in N recoveries ranging from 13% to 51%. Cost increase due to the use of CRFs for potato production ranged from $71.66 to $158.14/ha ($29 to $64 per acre) based on cost of material and N application rate. This higher cost may be offset by reduced application cost and cost-share pro-grams. Adoption of CRF programs by the potato (and vegetable) industry in Florida will depend on the accuracy and predictability of N release, state agencies' commitment to cost-share programs, and CRFs manufacturers' marketing strategies. All interested parties would benefit in the development of BMPs for CRFs.

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Louis G. Nickell and Glenn E. Vogt

The development of dark color is often a major problem in the processing of potatoes. This is due, in large part, to the reaction of reducing sugars with amino acids upon the application of heat during processing. Several chemicals have been shown which, when applied to foliage in the field, will decrease reducing sugars and dark color in processed potatoes.

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Jaime Barros da Silva Filho, Paulo Cezar Rezende Fontes, Paulo Roberto Cecon, Jorge F.S. Ferreira, Milton E. McGiffen Jr., and Jonathan F. Montgomery

while maintaining plant health. The production of seed potatoes in aeroponic systems is an alternative to the basic seed potato production method. In recent years, aeroponic systems were established to improve seed potato production ( Buckseth et al

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Harlene Hatterman-Valenti, Greg Endres, Brian Jenks, Michael Ostlie, Theresa Reinhardt, Andrew Robinson, John Stenger, and Richard Zollinger

glyphosate-resistant soybean acres in the state continue to rise ( Fig. 1 ). Similarly, there are 385,000 acres of dry edible pea, 655,000 acres of dry edible bean, and 82,000 acres of potato production, respectively, with a total production value at nearly

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Shelley Jansky, Sandra Austin-Phillips, and Corine McCarthy

This work was funded by USDA/ARS SCA #58-5114-0-1011 and the Univ. of Wisconsin–Stevens Point Univ. Personnel Development Committee. Wild species germplasm was obtained from the U.S. Potato Genebank, NRSP-6. We gratefully acknowledge the