American Potato Journal

, Volume 22, Issue 6, pp 173–187

Effect of fertilizers on the quality of potatoes grown in the Red River Valley of Minnesota


  • L. E. Dunn
    • Minn. Agricultural Experiment Station
  • C. O. Rost
    • Minn. Agricultural Experiment Station

DOI: 10.1007/BF02862608

Cite this article as:
Dunn, L.E. & Rost, C.O. American Potato Journal (1945) 22: 173. doi:10.1007/BF02862608


Cooking quality ratings and percentages of dry matter were obtained for potatoes grown at 30 different locations in the Red River Valley of Minnesota in 1942 and 1943 for the purpose of determining the influence of phosphate and potash fertilizers on cooking quality. The fertilizers were associated with slight but not significant increases in the cooking quality of potatoes grown on the heavy soils. For the light soils, which, in general, are more deficient in the nutrient elements than the heavy soils, the fertilizers caused significant improvements in cooking quality and particularly in baking quality. Potash fertilizers caused a significant reduction in surface sloughing of the potatoes when boiled in distilled water. The results indicate that the improvement in quality of potatoes grown on the light soils was partially due to the fertilizers supplying nutrients needed by the potato plant and partially to the increasing of the salt content of the potatoes by the fertilizers.

Phosphate fertilizers tended to increase the dry matter content of the potatoes. Potash fertilizer, on the other hand, lowered the dry matter content significantly, the average reduction being about one per cent for the regular muriate of potash treatment of 200 pounds per acre. In general, disregarding the influence of fertilizers, the higher the dry matter content of the potatoes, the higher the boiling and baking quality.

The results indicate that on soils which are deficient in potash, potash fertilizers will improve the cooking quality of potatoes when not used excessively, even though the dry matter content may be lowered somewhat. In the fertilization of potatoes, fertilizer mixtures should be used which do not lower the percentage of dry matter appreciably.

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© Springer 1945