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Potato Dry Matter Measurement

Three methods to measure Potato Dry Matter

The three dry matter measurement methods from Martin Lishman have been compared by potato industry bodies: no significant differences were found in their estimation of dry matter content; but each has its own benefits to suit where and how it is being used.

Dry matter measurement with the Martin Lishman dry matter field kit
Dry Matter Field Kit
dry matter measurement with the zeal manual hydrometer
Zeal Manual Hydrometer
dry matter measurement with the weltech digital hydrometer
Weltech Digital Hydrometer
dry matter measurement with the zeal manual hydrometer

The Importance of Dry Matter

Dry matter content directly influences the yield of processed potatoes, the oil absorption rate in fried products and the texture of cooked potatoes. Dry matter is also used as an indicator of bruising risk, with high levels associated with more damage.

Dry matter varies between varieties, but dry matter of the same variety may also vary between seasons in the same locality. This can be the result of differences in the time of planting, soil moisture and ambient temperature.

Typical dry matter ranges for various potato products*:

French Fries – 19.7 to 24.1%

Potato chips – 21.7 to 25.1%

Dehydrated products – 20.7 to 24.1%

* guidance only