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Influence of cultivar, harvest-date and soil nitrogen on sucrose, specific gravity and storage stability of potatoes grown in Michigan

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Abstract

The cultivars Atlantic, Belchip, Denali, Monona, Norchip and Russet Burbank were harvested at weekly intervals from early August to early October in 1980–81 and analyzed for the following attributes: 1) sucrose rating (SR) (mg sucrose/g fresh tuber) 2) specific gravity (Sp.G.); 3) total yield and 4) chip color. At the final harvest, samples of each cultivar were stored and analyzed for color to determine chipping ability after storage.

All varieties achieved a SR below 1.0 by 145 days of growth. Higher nitrogen levels reduced the total yield for early harvests but had no significant effect for later harvests. Changes in sucrose levels as tubers matured were helpful in evaluating the chemical maturity of more recently developed cultivars in relation to established chipping varieties.

Resumen

Los cultivares Atlantic, Belchip, Denali, Monona, Norchip y Russet Burbank fueron cosechados a intervalos semanales desde principios de Agosto hasta principios de Octubre, en 1980–1981, y analizados para las siguientes características: 1) nivel de sucrosa (SR) (mg de sucrosa/gramo de tubérculo fresco); 2) gravedad específica (Sp.G.); 3) rendimiento total, y 4) color de los cortes. A la cosecha final, se almacenaron muestras de cada cultivar y se analizaron por su color para determinar su aptitud al corte después de su almacenamiento.

Todas las variedades alcanzaron un SR por debajo de 1,0 alrededor de 145 días de crecimiento. Los niveles más altos de nitrógeno redujeron el rendimiento total en las cosechas tempranas, pero no tuvieron efecto significativo en las cosechas más tardías. Conforme los tubérculos maduraban, los cambios en los niveles de sucrosa fueron una ayuda para evaluar la madurez química de cultivares más recientemente desarrollados en relación con las variedades ya establecidas para la producción de papas para freir a la inglesa.

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Santerre, C.R., Cash, J.N. & Chase, R.W. Influence of cultivar, harvest-date and soil nitrogen on sucrose, specific gravity and storage stability of potatoes grown in Michigan. American Potato Journal 63, 99–110 (1986). https://doi.org/10.1007/BF02853689

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