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Phosphorus Sorption, Desorption, and Buffering Capacity in a Biosolids-Amended Mollisol

^a Agronomy Dep., Iowa State Univ., Ames, IA 50011-1010 USA

View larger version (16K): [in a new window]   Fig. 1 Phosphorus sorption isotherms for a Mollisol without and with two rates of biosolids amendment. Each point on the figure represents a mean of four replicate plots

View larger version (11K): [in a new window]   Fig. 2 Phosphorus sorption isotherms plotted according to the simple Langmuir equation. Each point on the figure represents a mean of four replicate plots

View larger version (11K): [in a new window]   Fig. 3 Phosphorus sorption isotherm plotted according to the two-surface Langmuir equation (soil without biosolids amendment)

View larger version (14K): [in a new window]   Fig. 4 The relationship between P sorbed from solution and soil organic C desorbed from the soil samples

View larger version (14K): [in a new window]   Fig. 5 Phosphorus Q/I relationships for a Mollisol without and with two rates of biosolids amendment

View larger version (27K): [in a new window]   Fig. 6 The effects of liquid/solid ratio and equilibration period on P desorbed from (a) soil samples from the control plots and (b) samples from the high biosolids-application rate plots