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Long-Term Effects of Poultry Litter, Alum-Treated Litter, and Ammonium Nitrate on Phosphorus Availability in Soils

^a USDA-ARS, Plant Sciences 115, Univ. of Arkansas, Fayetteville, AR 72701
^b Dep. of Agric. Eng., 128 Agric. Eng. Bldg., Univ. of Kentucky, Lexington, KY 40546-0276

View larger version (32K): [in this window] [in a new window]   Fig. 1. Mehlich III P (0 to 5 cm) as a function of time for various rates of (A) alum-treated litter, (B) normal poultry litter, and (C) ammonium nitrate.

View larger version (31K): [in this window] [in a new window]   Fig. 2. Water-extractable P (0 to 5 cm) as a function of time for various rates of (A) alum-treated litter, (B) normal poultry litter, and (C) ammonium nitrate.

View larger version (26K): [in this window] [in a new window]   Fig. 3. Relationship between water-extractable P and Mehlich III P in soils fertilized with normal or alum-treated poultry litter.

View larger version (19K): [in this window] [in a new window]   Fig. 4. Water-extractable P (0 to 5 cm) in soil as a function of fertilizer application rate after 7 yr of fertilization (LSD0.05 = 4.7).

View larger version (19K): [in this window] [in a new window]   Fig. 5. Mehlich III-extractable P (0 to 5 cm) in soil as a function of fertilizer application rate after 7 yr of fertilization (LSD0.05 = 47.3).

View larger version (19K): [in this window] [in a new window]   Fig. 6. Mehlich III P in soil as a function of depth after 7 yr of fertilization with the high rates of litter and ammonium nitrate.

View larger version (18K): [in this window] [in a new window]   Fig. 7. Water-soluble P in soil as a function of depth after 7 yr of fertilization with the high rates of litter and ammonium nitrate.

View larger version (18K): [in this window] [in a new window]   Fig. 8. Water-extractable P in soil at the 10- to 20-cm depth as a function of fertilizer application rate after 7 yr of fertilization (LSD0.05 = 2.1).

View larger version (17K): [in this window] [in a new window]   Fig. 9. Average forage P concentration during Year 7 as a function of fertilizer rate (LSD0.05 = 591).

View larger version (17K): [in this window] [in a new window]   Fig. 10. Average P uptake by tall fescue during Year 7 as a function of fertilizer rate (LSD0.05 = 3.8).

View larger version (17K): [in this window] [in a new window]   Fig. 11. Cumulative phosphorus loads in runoff from paired watersheds fertilized with alum-treated and normal litter.

View larger version (15K): [in this window] [in a new window]   Fig. 12. Cumulative phosphorus loads in runoff from paired watersheds fertilized with alum-treated and normal litter as a function of the amount of cumulative soluble phosphorus applied.