Phosphorus status of some Ethiopian soils


Phosphorus status
Ethiopian soils

How to Cite

Phosphorus status of some Ethiopian soils. (1986). Tropical Agriculture, 63(2).


The content and distribution of total, organic and different inorganic P fractions were studied in some Ethiopian soil profiles selected to represent the main soil types. Total P was relatively low in most soils except for the alluvial soils of Melka Werer with an average maximum value of 1266 ppm. The organic P found in lower horizons of some soils suggested either a translocation of organic materials down the profiles (Jima) or a stratification for deposits of ash (Awassa) and alluvium (Melka Werer). The relative abundance of the inorganic P forms interacting with the soil solution was generally Fe-P > Al-P > Ca-P > reductant soluble P. In particular, for Holeta and Bako, Ca-P was higher than Al-P going down the profile whereas Ca-P was the most abundant form in Melka Werer soils. The non-extractable or residual P form was relatively large except in less well drained soils. The amount and distribution of the inorganic forms were indicative of weathering in the soils with good drainage. The available P status was generally limited and reflected the low content of contributing active P forms.