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. 2023 Aug 24;14:1235686. doi: 10.3389/fpls.2023.1235686

Figure 1.

Figure 1

Principal component loading plot and scores of principal component analysis (PCA) of growth parameters, mineral elements, SPAD index, starch, soluble carbohydrates, polyphenols, and total amino acids in basil leaves untreated (Control) or foliarly treated with copper sulfate (Cu), copper complexed with amino acids and peptides (Cu-VPH), vegetal protein hydrolysate (VPH), and Cu-VPH enriched with VPH (VPH+Cu-VPH).