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Hydrochloric Fractions in Hedley Fractionation May Contain Inorganic and Organic Phosphates

^a USDA-ARS, New England Plant, Soil, and Water Lab., Orono, ME 04469
^b Dep. of Plant and Soil Science, Alabama A&M Univ., Normal, AL 35762

View larger version (24K): [in a new window]   Fig. 1. Concentrations of inorganic (P-i), inorganic and enzymatically hydrolyzable organic P (P-i+e), and total P (P-t) in sequentially extracted 1 M HCl fractions of Alabama pastoral Hartselle soils with 0-yr (PLS0), 15-yr (PLS15), and 20-yr (PLS20) poultry litter applications and in Alabama arable Decatur soils with no-tilled soybean (NTSoy), no-tilled corn (NTCorn), conventional soybean (CTSoy), and conventional corn (CTCorn) cropping systems. Values are averages ± standard deviations (n = 6 for poultry litter soils; n = 4 for others).

View larger version (34K): [in a new window]   Fig. 2. Concentrations of inorganic (P-i), inorganic and enzymatically hydrolyzable organic P (P-i+e), and total P (P-t) in sequentially extracted 1 M HCl fractions of soils mixed with or without dairy manure. Maine unnamed soils without dairy slurry Day 0 (MC0) and with dairy slurry Day 0 (MD0) after a 150-d incubation (MC150 and MD150). Oregon Adkins soils without dairy slurry Day 0 (OC0) and with dairy slurry Day 0 (OD0) and after incubated 150 d (OC150 and OD150). Values are averages ± standard deviations (n = 4).

View larger version (33K): [in a new window]   Fig. 3. Concentrations of inorganic (P-i), inorganic and enzymatically hydrolyzable organic P (P-i+e), and total P (P-t) in sequentially extracted 1 M HCl fractions of swine manure (SW1 and SW2), beef cattle manure (BC1), dairy cattle manure (DC1), and poultry litter (PL1, PL2, PL3, and PL4). Values are averages ± standard deviations (n = 3).

View larger version (14K): [in a new window]   Fig. 4. Relationship of metal contents and total P contents in HCl fractions of soils. The four soil samples were mold-board plow in corn (CTCorn), Alabama pastoral Hartselle soils with 20-yr poultry litter applications (PLS20), Maine soil amended with dairy slurry at 150-d (MD150), and Oregon soil amended with dairy slurry at 150 d (OD150) (see Fig. 1 and 2) with the increasing order of P contents (m mol kg–1 dry soil). Horizontal bars represent standard deviations of P contents. Vertical bars represent standard deviations of metal contents.

View larger version (17K): [in a new window]   Fig. 5. Relationship of metal contents and total P contents in HCl fractions of animal manure. The four manure samples were dairy cattle manure (DC1), swine manure (SW1), and poultry litter (PL1 and PL3) (Fig. 3) with the increasing order of P contents (m mol kg–1 dry soil). Horizontal bars represent standard deviations of P contents. Vertical bars represent standard deviations of metal contents.