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Fig. 4. Phosphorus shoot concentration as a function of N concentration of corn in an experiment conducted at one site in 2004 and two sites in 2005 under limiting N conditions (NNI < 0.80). Solid line, linear regression (P = 1.00 + 0.094N) for nonlimiting N conditions as presented in Fig. 4; dashed line, linear regression [P = 1.25 + 0.104N, R² = 0.95, P < 0.001, n = 13] for limiting N conditions.

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