Conclusions
From a study of fourteen experiments with copper, manganese, and zinc no significant increase in yield was produced. From these experiments it is concluded that it would be inadvisable to add these elements to the fertilizer mixture for potatoes in this section at this time.
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Hester, J.B., Carolus, R.L. Three years’ results with the use of copper, manganese and zinc sulphate in fertilizer mixtures for potatoes. American Potato Journal 14, 37–39 (1937). https://doi.org/10.1007/BF02911803
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DOI: https://doi.org/10.1007/BF02911803