TY - CONF ID - orgprints10252 UR - http://orgprints.org/10252/ A1 - Schnug, E A1 - Haneklaus, S A1 - Kratz, S A1 - Fan, X Y1 - 2006/// N2 - Balanced fertilisation is essential for a considerate use of limited phosphorus (P) resources and for sustainability in organic farming. Plant available soil P levels will decrease and soil fertility will diminish when using P sources with limited P availability such as rock phosphates, bone and bone meals. An in situ digestion with a combination product of elemental S and rock phosphate enhanced significantly the solubility of non water-soluble P sources. In addition to the problem of insufficient solubility, mineral P sources can be contaminated with toxic heavy metals such as Cd 0.1?92.3 mg kg-1) and U (