Fig. 1. (a) Calcium chloride P and (b) resin P in five soils following incubation with no P addition (control) or with poultry litter, poultry manure, cattle slurry, sewage sludge, or KH2PO4 applied at 100 mg P kg-1 soil.
Fig. 1. (a) Calcium chloride P and (b) resin P in five soils following incubation with no P addition (control) or with poultry litter, poultry manure, cattle slurry, sewage sludge, or KH2PO4 applied at 100 mg P kg-1 soil.