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Plant Availability of Phosphorus in Swine Slurry and Cattle Feedlot Manure

Bahman Eghball^a,, Brian J. Wienhold^a,*, Bryan L. Woodbury^b and Roger A. Eigenberg^b

^a USDA-ARS, Lincoln, NE 68583
^b USDA-ARS, Clay Center, NE 68933

View larger version (29K): [in a new window]   Fig. 1. Soil x temperature x manure x water regime interaction means averaged across sampling times. Water regimes were constant (60% water-filled pore space, WFPS) or variable (dry down from 60 to 30% WFPS). NOM indicates no manure, and MAN indicates swine manure application.

View larger version (27K): [in a new window]   Fig. 2. Phosphorus levels in three soils incubated with either swine slurry or no manure averaged across sampling times and water regimes.

View larger version (20K): [in a new window]   Fig. 3. Water-soluble P, averaged across water regime, in three soils incubated with either swine slurry or no manure and sampled at different times. Time T0 is when soil samples were taken on the day the experiment started, and T2 and T4 are sampling cycles when the soil in the varying water regime treatment reached 30% water-filled pore space.

View larger version (23K): [in a new window]   Fig. 4. Soil test P levels as influenced by (a) incubation temperature and sampling times and (b) soil and sampling time for the beef cattle feedlot manure study. Time T0 is when soil samples were taken on the day the experiment started, and T1 to T4 are sampling cycles when the soil in the varying water regime treatment reached 30% water-filled pore space.

View larger version (32K): [in a new window]   Fig. 5. Water-soluble P levels in three soils as influenced by (a) incubation temperature and (b) beef cattle feedlot manure and no-manure treatments.