Figure 3From: Optimized procedure for the determination of P species in soil by liquid-state 31P-NMR spectroscopy 31 P-NMR spectra of extracts from different materials and relative amount (%) of P species at different NMR acquisition times. (C) Forest soil. (D) Forest litter. (E) Compost. MDP, metylendiphosphonic acid-P,P'-disodium salt as internal standard; PL, phospholipids.Back to article page