Figure 1. Correlation between seed phytic acid P content of 42 soybean genotypes determined by the modified colorimetric method and by the other assay methods: high-performance liquid chromatography (HPLC), anion exchange column (AEC), and nuclear magnetic resonance (NMR). The solid line (y = x) represents a 1:1 relationship between colorimetric phytic acid P and phytic acid P determined by other methods.