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Synopsis: Observed effects of increased P content over part of the range of N fertilization seemed best explained by physiological changes in the plant arising from increased N uptake as factors leading to other explanations were inoperative in this study.
2 Former research associate, (now Extension Soil Chemist, Texas Agricultural Extension Service), and Professors of Soils, respectively, Iowa State University.
Received for publication November 18, 1961.
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