Summary
In this experiment on Congaree soil 1 ton per acre of a 5-5-5 mixture gave the most profitable yield. Increasing the percentage of N, P or K in the mixture did not result in significant increases in yield except in the case of P where 9% gave a significant increase over 5% but not over 7%.
The application of 1.5 tons of a 5-7-5 mixture gave a significant increase over 1 ton application of the same mixture but usually one ton of a complete mixture will return the most profitable yields. However, some years according to the cost of the fertilizer and to the price received for the potatoes a 1.5 tons application should be profitable.
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Technical Contribution No. 17 from the South Carolina Agricultural Experiment Station, Clemson College, S.C.
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Musser, A.M. Nine years results with potato fertilizers. American Potato Journal 9, 151–157 (1932). https://doi.org/10.1007/BF02879994
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DOI: https://doi.org/10.1007/BF02879994