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Soil Characteristics and Management Effects on Phosphorus Sorption by Highland Plateau Soils of Ethiopia

^a Dep. of Soil Science, North Carolina State Univ., Box 7619, Raleigh, NC 27695-7619 USA

View larger version (27K): [in a new window]   Fig. 1 Solution P concentration as a function of P applied for surface soil samples (0–15 cm) from the highland plateau areas of Ethiopia. (Standard errors are calculated on the basis of duplicate samples analyzed)

View larger version (26K): [in a new window]   Fig. 2 Phosphorus sorption isotherms for applied P sorbed expressed per unit mass of soil for surface soil samples (0–15 cm) from the highland plateau areas of Ethiopia. (Standard errors are calculated on the basis of duplicate samples analyzed)

View larger version (24K): [in a new window]   Fig. 3 Phosphorus sorption isotherms for applied P sorbed expressed per unit surface area for surface soil samples (0–15 cm) from the highland plateau areas of Ethiopia. (Standard errors are calculated on the basis of duplicate samples analyzed)

View larger version (26K): [in a new window]   Fig. 4 Phosphorus sorption isotherms considering the resin-P as initially sorbed P for surface soil samples (0–15 cm) from the highland plateau areas of Ethiopia. (Standard errors are calculated on the basis of duplicate samples analyzed)

View larger version (27K): [in a new window]   Fig. 5 Phosphorus sorption isotherms considering the sum of resin, NaHCO3 Pi, and NaOH Pi as initially sorbed P for surface soil samples (0–15 cm) from the highland plateau areas of Ethiopia. (Standard errors are calculated on the basis of duplicate samples analyzed)