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Abstract
Variability in specific gravity of Russet Burbank potatoes was documented in a single 32 hectare field. Maximum variation was 40 units among individual tubers within hills (one unit equals one part in 1000th of specific gravity measurement) and 15 units among hills. Field site variability of 10–15 units was common between sampled grid lines in the field; but bulked samples (truckloads) reduced the sampled variability to 8–10 units. When the samples were taken from bulked lots as opposed to single hill samples, the variability decreased. Grower lots, which were pooled samples from several truckloads, showed specific gravity differences of 2–7 units even though all lots were from the same field. These variations among specific gravity samples should be taken into account when considering total solids content in any lot of potatoes.
Shed temperatures are controlled, from approximately 41.F. Needed for seed potatoes to 48.F. Need for potatoes that remain in storage. Since 60 percent of the potatoes grown in Idaho are used for processed products, specific gravity plays an extremely important role in the consistent production of high quality Idaho® potato products. It looks like a giant potato in space, and yet the information in this model is the sharpest view we have of how gravity varies across the Earth. The globe has been released by the team working on.
Degree of russetting of the skin and hollow heart also influenced specific gravity measurements. Measured differences between peeled and unpeeled lots of 10 units in specific gravity corresponded to 2% difference in total solids content. Statistically, the variance of the peeled lot was one half that of the unpeeled lot, therefore, to minimize the measured differences due to skin type, peeled potatoes could be used for the specific gravity measurements.
Compendio
Se probó la variabilidad en la gravedad específica de las papas Russet Burbank en un solo campo de 32 hectáreas. La variación máaxima entre tubérculos individuales dentro de los puntos de siembra fue de 40 unidades (una unidad es igual a una parte por milésimo de la gravedad específica medida) y 15 unidades entre puntos de siembra. Fue común encontrar una variabilidad de 10–15 unidades entre las diferentes muestras tomadas en el terreno convenientemente dividido; pero muestras al granel (camionadas) redujeron la variabilidad de las muestras a 8–10 unidades. Cuando las muestras fueron tomadas de lotes al granel en oposición a muestras de un solo golpe o punto de siembra, la variabilidad disminuyó. Los lotes de los productores, que fueron una mezcla de muestras tomadas de varias camionadas, mostraron diferencias de 2–7 unidades en la gravedad específica aún en el caso que todos los lotes fueran del mismo campo. Estas variaciones en las muestras, en cuanto a gravedad específica, deben tomarse en cuenta cuando se considere el contenido total de sólidos en cualquier lote de papas.
El grado de reticulado de la piel y el de corazón vacío influencian también las mediciones de la gravedad específica. Las diferencias en las mediciones de la gravedad específica entre lotes pelados y sin pelar, que fueron de 10 unidades, corresponden a un 2% de diferencia en el contenido de sólidos totales. Estadísticamente, la variancia de los lotes pelados fue la mitad que la de los lotes sin pelar, por lo tanto, para minimizar las diferencias en las mediciones, debidas a las condiciones de la piel, se podrian usar papas peladas para las medición de la gravedad específica.
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Supported by the University of Idaho, College of Agriculture, Moscow, Idaho, the USDA Agricultural Research Service, Kimberly, Idaho 83341, and the Idaho Potato Commission.
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Gravity Guygaming Potatoes Recipes
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Kleinkopf, G.E., Westermann, D.T., Wille, M.J. et al. Specific gravity of Russet Burbank potatoes. American Potato Journal64, 579–587 (1987). https://doi.org/10.1007/BF02853760
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DOI: https://doi.org/10.1007/BF02853760
Key Words
Gravity Guygaming Potatoes Au Gratin
- Weight in air-weight in water
- dry matter
- hollow heart
- potato processing