Fig. 5. Effect of treatment type and incubation time on Bray-1 P for (a) Soil I, (b) Soil II, and (c) Soil III at the low (12.5 mg P kg^–1) manure application rate. Cont., control; M-L, manure with low P application rate; ATM-L, Al-treated manure with low P application rate; ITM-L, Fe-treated manure with low P application rate; LTM-L, Ca-treated manure with low P application rate. Error bars show plus and minus one standard deviation.