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Development and Composition of Spring Wheat as Influenced by Nitrogen and Phosphorus Fertilization¹

Synopsis: Dry matter production and N uptake by wheat reached a maximum at heading, soft dough, and maturity on NP, N, and unfertilized plots, respectively. Maximum P uptake occurred by heading irrespective of treatment. Nitrogen and phosphorus in the grain were derived primarily by translocation from leaves, stems, and chaff, and the amount was influenced by fertilization.

² Soil Scientists, Western Soil and Water Management Research Branch, SWCRD, ARS, USDA, Mandan, North Dakota. The authors are indebted to E. F. Miles (deceased) for analyzing the samples and to R. W. Carpenter for conducting a portion of the study.

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