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Phosphorus Dynamics in Soils Receiving Chemically Treated Dairy Manure

Biological Systems Engineering Department, 460 Henry Mall, University of Wisconsin, Madison, WI 53706

View larger version (27K): [in a new window]   Fig. 1. Effect of treatment type and incubation time on water-extractable phosphorus (WEP) 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.

View larger version (28K): [in a new window]   Fig. 2. Effect of treatment type and incubation time on water-extractable phosphorus (WEP) 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.

View larger version (20K): [in a new window]   Fig. 3. Effect of treatment type on the fraction of applied P released as water-extractable phosphorus (WEP), termed as percent WEP released. M-L, manure with low P application rate; M-H, manure with high P application rate; ATM-L, Al-treated manure with low P application rate; ATM-H, Al-treated manure with high P application rate; ITM-L, Fe-treated manure with low P application rate; ITM-H, Fe-treated manure with high P application rate; LTM-L, Ca-treated manure with low P application rate; LTM-H, Ca-treated manure with high P application rate.

View larger version (26K): [in a new window]   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.

View larger version (27K): [in a new window]   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.

View larger version (27K): [in a new window]   Fig. 6. Effect of treatment type on the fraction of applied phosphorus released as Bray-1 phosphorus (PBray-1). M-L, manure with low P application rate; M-H, manure with high P application rate; ATM-L, Al-treated manure with low P application rate; ATM-H, Al-treated manure with high P application rate; ITM-L, Fe-treated manure with low P application rate; ITM-H, Fe-treated manure with high P application rate; LTM-L, Ca-treated manure with low P application rate; LTM-H, Ca-treated manure with high P application rate.