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Fate of Phosphorus in Dairy Wastewater and Poultry Litter Applied on Grassland

A. F. Johnsona, D. M. Vietor*,a, F. M. Rouquette, Jr.b and V. A. Habyb

a Soil and Crop Sciences Department, Texas A&M University, College Station, TX 77843-2474
b Texas A&M University Agricultural Research and Extension Center, Overton, TX 75684



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  		Fig. 1. Extractable soil P on the final sampling date (October 1996) for control and three annual P rates (kg ha–1) applied as dairy wastewater over four years on coastal bermudagrass over-seeded with annual ryegrass on a Darco loamy sand. Means followed by the same letter within depths are not significantly different (P = 0.05).

 


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  		Fig. 2. Extractable soil P after the initial year (October 1993) of a 4-yr study for control and three annual P rates (kg ha–1) applied as poultry litter on coastal bermudagrass over-seeded with annual ryegrass on a Darco loamy sand. Means followed by the same letter within depths are not significantly different (P = 0.05).

 


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  		Fig. 3. Extractable soil P on the final sampling date (October 1996) of a 4-yr study for control and three annual P rates (kg ha–1) applied as poultry litter on coastal bermudagrass over-seeded with annual ryegrass on a Darco loamy sand. Means followed by the same letter within depths are not significantly different (P = 0.05).

 




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