Abstract
In studies on a sandy soil in Florida over a 3-yr period (1984–86), applications of Ca (CaSO4) inconsistently affected the bacterial soft rot potential of potato tubers (Solanum tuberosum). The potential was estimated from the severity of the disease (percent surface area decayed) in tubers that had been immersed in an aqueous cell suspension ofErwinia carotovora subsp.carotovora and then incubated 4 days in a mist chamber at 24 C. With freshly harvested tubers (tested within 5 days after harvest), disease severity averaged 49, 11, and 4% over all treatments in 1984, 1985, and 1986, respectively, which was roughly proportional to rainfall on the crop,e.g., 37, 18, and 15 cm, respectively. Disease severity decreased, did not change, and increased with increased Ca rate (0, 450, and 900 kg.ha-1) in 1984, 1985, and 1986, respectively. In each season, severity was affected by interactions involving the Ca treatments. Most interactions involved cultivar. The efficacy of Ca applications to potatoes grown in low Ca soils for enhancement of tuber resistance to bacterial soft rot may be limited by factors associated with environment or cultivar that are not completely understood.
Compendio
En estudios efectuados en un suelo arenoso de Florida durante un periodo de tres años (1984–1986), las aplicaciones de Ca (CaSO4) afectaron inconsistentemente el potencial bacteriano de la purdrición blanda de los tubérculos de papa (Solanum tuberosum). El potencial fue estimado por la severidad de la enfermedad (porcentaje de área de superficie afectada) en tubérculos que habían sido sumergidos en una suspensión acuosa deErwinia carotovora subsp.carotovora y luego incubada por cuatro días en una cámara nebulizadora a 24°C. Con tubérculos recién cosechados (probados dentro de los cinco días después de la cosecha), la severidad de la enfermedad promedió 49, 11 y 4% sobre todos los tratamientos en 1984, 1985 y 1986, respectivamente. La severidad de la enfermedad disminuyó, no varió y se incrementó con el incremento de la dosis de Ca (0, 450 y 900 kg.ha−1) en 1984, 1985 y 1986, respectivamente. En cada temporada, la severidad fue afectada por interacciones incluyendo a los tratamientos con Ca. La mayoría de las interacciones incluyeron al cultivar. La eficacia de las aplicaciones de Ca a las papas cultivadas en suelos de bajo contenido de Ca para mejorar la resistencia de los tubérculos a la pudricion blanda bacteriana puede ser limitada por factores asociados con el medio ambiente o el cultivar que no están totalmente comprendidos.
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Florida Agricultural Experiment Station. Journal Series No. R01379.
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Bartz, J.A., Locascio, S.J. & Weingartner, D.P. Calcium and potassium fertilization of potatoes grown in North Florida. II. Effect on the bacterial soft rot potential in the tubers. American Potato Journal 69, 39–50 (1992). https://doi.org/10.1007/BF02853409
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DOI: https://doi.org/10.1007/BF02853409