Scatterplots of Response Surfaces.  Individual replicates used to construct response surfaces for %Yield, fresh weight, dry weight, water, shoot length, and leaf count are presented in scatterplots (N = 2-6).  The dotted black box represents the original range of concentrations (0 – Level 2) tested. The unit for SWE is % v/v. Source data are attached. Ethylenediaminetetraacetic Acid Iron (III) (EDTA-Fe), 6-Benzylaminopurine (6-BAP), Humic Acid (HA), and Seaweed Extract (SWE).