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Three-dimensional response surfaces for inflorescence yield (g/plant) at a range of nutrient solution N, P, and K concentrations (mg L–1) of Cannabis sativa grown in deep water culture (P ≤ 0.05, R2 = 0.57). (A) Surface plot of K vs. P at N = 180 mg L–1. (B) Surface plot of K vs. N at P = 60 mg L–1. (C) Surface plot of P vs. N at K = 200 mg L–1.
