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Synopsis: Difference in dry-matter yields among plots given different levels of N fertilizer gradually increased to a maximum at time of maximum yield. The time of maximum yield occurred later in the growing season on plots fertilized with N than on unfertilized plots. During early stages of growth the internal concentration of N in herbage increased with each increment of applied N. The rate of dilution of internal N increased with increasing levels of applied N.
2 Research Agronomist, Crops Research Division, ARS, USDA, Assistant Professor of Animal Science, and Associate Professor of Animal Nutrition, respectively, Oregon State University.
Received for publication September 23, 1963.
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