Agronomy Journal -- Lippke et al. 98 (5): 1333 Figure IG6

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Fig. 6. Treatment means for P uptake, Year 3. Model equation: kg ha^–1 = 2.998 + (N_A x 0.02890) + (P_A x 0.3777) + (N_A x P_A x 3.863 x 10^–4) – (N_A x N_A x 5.246 x 10^–5) – (P_A x P_A x 4.280 x 10^–3), (n = 21, R² = 0.93, s = 2.10).