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Manure Phosphorus Extractability as Affected by Aluminum- and Iron By-Products and Aerobic Composting

Thanh H. Dao*,a, L. J. Sikoraa, A. Hamasakib and R. L. Chaneya

a USDA-ARS, Animal Manure and By-Products Lab., BARC-East, 10300 Baltimore Ave., Beltsville, MD 20705
b Mitsubishi Heavy Industries, Takasago, Japan



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  		Fig. 1. Effects of Al (Al-WTR) and Fe (Fe-BP) mineral by-products (A) and composting (B) on the distribution of P fractions in poultry manure. Treatment means for each extracted P fraction (DRP, FEP, CBDP, and H2SO4–P) followed by the same letter are not significantly different at the 0.05 level of probability. DRP = dissolved reactive P; FEP = 0.5 M NH4F–extractable P; SHEP = 0.1 M NaOH–extractable P; CBDP = citrate–bicarbonate–dithionite extractable P; and H2SO4–P = 0.25 M H2SO4–extractable P.

 


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  		Fig. 2. Sorption of PO4–P on the Al-water treatment residual at 20°C (Langmuir sorption isotherm and 95% confidence intervals).

 


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  		Fig. 3. Compost temperature during the composting of unamended poultry manure and manure amended with Al-water treatment residual (Al-WTR) and iron-rich by-product.

 




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