2-Dimensional Heatmaps of Compound Interaction. The heatmaps representing the 2-dimensional view of response surfaces for compound interactions in %Yield and morphological features (N = 2-6).  The dotted black box represents the original range of concentrations (0 – Level 2) tested. The unit for SWE is % v/v. Statistics and source data are attached. Ethylenediaminetetraacetic Acid Iron (III) (EDTA-Fe), 6-Benzylaminopurine (6-BAP), Humic Acid (HA), and Seaweed Extract (SWE).