| Abstract: | NH4-F extractable P in Pelosols and Cambisols The percentage of “Al-P” of the extractable inorganic P (∑“Al”-+“Fe”-+“Ca-P”, following the Chang and Jackson method) was assumed to be higher at the same pH in soils from basaltic parent material (as a result of an early Al supply from tektosilicates and slow clay formation) than in soils from clay-stone parent material. Contrary to this assumption, the percentage was (with one exception) not higher, probably because of an “Antivariscite-effect” by the 2:1 (clay) minerals. |
