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

^a Jr., USDA-ARS, Plant Sciences 115, University of Arkansas, Fayetteville, AR 72701
^b Department of Agricultural Engineering, 128 Agricultural Engineering Building, University of Kentucky, Lexington, KY 40546-0276

View larger version (25K): [in a new window]   Fig. 1. Temporal variability in soil pH as a function of fertilizer type (values represent averages of the four rates). Samples taken from the 0- to 5-cm depth.

View larger version (17K): [in a new window]   Fig. 2. Soil pH as a function of fertilizer treatment and rate after 7 yr (LSD0.05 = 0.18). Samples taken from the 0- to 5-cm depth. Fertilizer rates (Rates 1, 2, 3, and 4) were respectively 2.24, 4.49, 6.73, and 8.98 Mg ha–1 for poultry litter and 65, 130, 195, and 260 kg N ha–1 for ammonium nitrate.

View larger version (22K): [in a new window]   Fig. 3. Temporal variability in exchangeable Al as a function of fertilizer type (values represent averages of the four rates). Samples taken from the 0- to 5-cm depth.

View larger version (18K): [in a new window]   Fig. 4. Exchangeable Al as a function of fertilizer treatment and rate after 7 yr (LSD0.05 = 15.1). Samples taken from the 0- to 5-cm depth. Fertilizer rates (Rates 1, 2, 3, and 4) were respectively 2.24, 4.49, 6.73, and 8.98 Mg ha–1 for poultry litter and 65, 130, 195, and 260 kg N ha–1 for ammonium nitrate.

View larger version (15K): [in a new window]   Fig. 5. Exchangeable Al as a function of soil pH. Samples taken from the 0- to 5-cm depth.

View larger version (29K): [in a new window]   Fig. 6. Nitric and perchloric acid–extractable Al as a function of depth and fertilizer type at Year 7 (LSD0.05 = 1.97).

View larger version (13K): [in a new window]   Fig. 7. Exchangeable Al as function of titratable acidity at Year 7. Samples taken from the 0- to 5-cm depth.

View larger version (25K): [in a new window]   Fig. 8. Soluble and total Al concentrations in runoff at Year 6 as a function of fertilizer rate.

View larger version (27K): [in a new window]   Fig. 9. Cumulative tall fescue yields as a function of time for the various fertilizer types. Data represent the average of four rates of each fertilizer source.

View larger version (19K): [in a new window]   Fig. 10. Cumulative tall fescue yields as a function of fertilizer rates after 8.7 yr (LSD0.05 = 9.2). Fertilizer rates (Rates 1, 2, 3, and 4) were respectively 2.24, 4.49, 6.73, and 8.98 Mg ha–1 for poultry litter and 65, 130, 195, and 260 kg N ha–1 for ammonium nitrate.