Fig. 4. Effect of treatment type and incubation time on Bray-1 P for (a) Soil I, (b) Soil II, and (c) Soil III at the high (25 mg P kg^–1) manure application rate. Cont., control; M-H, manure with high P application rate; ATM-H, Al-treated manure with high P application rate; ITM-H, Fe-treated manure with high P application rate; LTM-H, Ca-treated manure with high P application rate. Error bars show plus and minus one standard deviation.