Figure 1From: Optimized procedure for the determination of P species in soil by liquid-state 31P-NMR spectroscopy 31 P-NMR spectra of extracts from samples subjected to different treatments and 15 h acquisition time. (A) Farmland soil. (B) Farmland soil added with compost. (C) Forest soil. (D) Forest litter. MDP, metylendiphosphonic acid-P,P′-disodium salt as internal standard; PL, phospholipids.Back to article page