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Synopsis: After the first harvest year, yields tended to increase with increased row spacing, but often the differences were not significant. Fertilizer applied at rates of up to 400 pounds of nitrogen per acre produced highly significant yield increases for each increment of nitrogen added.
2 Research Agronomists, Crops Research Division, ARS, USDA. The authors express their appreciation for helpful advice to A. R. Schmid, Department of Agronomy and Plant Genetics, University of Minnesota.
Received for publication August 2, 1958.
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