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Effets of soil potash treatment and storage temperature on blackspot bruise development in tubers of fourSolanum tuberosum cultivars

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Abstract

Plots of Russet Burbank, Nampa, Targhee, and A6371-2 received O, 250, and 500 lb of potash (K2O/A as KC1 or K2SO4). Tubers were bruised following harvest. Potash treatment had no significant effect in reducing blackspot development when there was no yield response to K fertilization. On soil that tested low for K, potash treatment significantly reduced blackspot development for all four cultivars. Tuber subsamples were bruised after 6 mo in storage at either 1.7 or 10 C. Differences in blackspot bruise development between low and high K were maintained for those tubers stored at 10 C; differences were not maintained and little discoloration developed in tubers stored at 1.7 C, due perhaps to less enzyme activity and less substrate. The Nampa cultivar was significantly more resistant to blackspot than the other three cultivars.

Resumen

Parselas de Russet Burbank, Nampa, Targhee y A6371-2 recibieron O, 250, y 500 libras de potasa (K2O/A como KCL o K2SO4. Los tubérculos fueron lesionados después de la cosecha. La aplicación de patasa no tuvo efecto significativo en reducir el desarrollo de mancha negra cucando no hubo respuesta a la fertilización potásica en la cosecha. En suelos de bajo contenido potásico en el análisis, el uso de potasa redujo significativamente el desarrollo de mancha negra en los cuatro cultivares. Submuestras de tubérculos fueron lesionados después de 6 meses n almacen a temperaturas de 1.7 o 10° C. Las diferencias en el desarrollo de manchas negras (debidas a lesiones des tubérculo) entre bajo y alto potasio se mantuvieron para aquellos tubérculos almacenados a 10° C; estra diferencias no se mantuvieron y, poca descoloración desarrolló en los tubérculos almacenados a 1.7 C, debido quizás a menor actividad enzimática y menos substrato. El cultivar Nampa fue significativamente más resistente al desarrollo de manchas negras que los otros tres cultivares.

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Authors and Affiliations

  1. University of Idaho College of Agriculture Research & Extension Center, 83210, Aberdeen

    Robert B. Dwelle (Assistant Research Professor of Plant Physiology), G. F. Stallknecht (Associate Research Professor of Plant Physiology), R. E. McDole (Associate Research Professor of Soils) & Joseph J. Pavek (Research Geneticist-USDA)

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  1. Robert B. Dwelle
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  2. G. F. Stallknecht
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  3. R. E. McDole
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  4. Joseph J. Pavek
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Approved by Director of Agricultural Experiment Station as Research Paper No. 7672.

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Dwelle, R.B., Stallknecht, G.F., McDole, R.E. et al. Effets of soil potash treatment and storage temperature on blackspot bruise development in tubers of fourSolanum tuberosum cultivars. American Potato Journal 54, 137–146 (1977). https://doi.org/10.1007/BF02852869

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  • DOI: https://doi.org/10.1007/BF02852869

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