The dependence of internal brown spot development upon calcium fertility in potato tubers |
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Authors: | Nora L Olsen Larry K Hiller Loretta J Mikitzel |
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Institution: | (1) Department of Horticulture and Landscape Architecture, Washington State University, 99164-6414 Pullman, Washington, USA |
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Abstract: | Summary To determine calcium fertility and high temperature effects on internal brown spot development in potato, cv. Russet Burbank
plants were fertilised with Hoagland's nutrient solution with or without calcium. Prevalence and severity of internal brown
spot were greatest in tubers receiving no calcium fertilisation during growth. Internal brown spot was evident as early as
tuber initiation. A high growth medium temperature (32°C) at tuber maturity with a lack of calcium increased internal brown
spot incidence and severity. No tubers subjected to the high temperature and fertilised with calcium developed internal brown
spot. Peel calcium concentration of tubers receiving no calcium fertilisation was lower (0.5–0.8 g/kg) than tubers receiving
calcium (1.2–1.9 g/kg). Medullary tissue calcium concentration was similar under both calcium regimes. Calcium availability
during early tuber growth was an influential factor in internal brown spot development, however high temperature effects may
not be discounted in exacerbating the disorder.
H/LA Paper No. 95-7. Project No. 1984, College of Agriculture and Home Economics Research Center, Pullman WA 99164, USA |
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Keywords: | Solanum tuberosum L temperature stress growth nutrient deficiency tuber analysis tuber size glasshouse growth room |
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