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Fig. 6. Linear regressions between spin–lattice relaxation rate (T1) values for orthophosphate (solid line) or orthophosphate monoesters (from the four peaks representing largely inositol hexakisphosphate), orthophosphate diesters, and pyrophosphate (dashed line), and the ratio of P to Fe and Mn in each reconstituted nuclear magnetic resonance (NMR) sample (on a mg L–1 basis). Note, the 95% confidence intervals for each relationship are given as the dotted lines and the number of asterisks denote significance at the 0.01 (**) and 0.001 (***) probability levels. Data from Cade-Menun et al. (2002) are included as solid black symbols. Manure samples are plotted with white fill.
