Assessment of soil phosphorus status and management of phosphatic fertilisers to optimise crop production

abonos fosfatados africa afrique americas analyse de sol asia asie australia australie carence du sol case studies chimie du sol deficiencias del suelo europa europe fertilidad del suelo fertilisation fertilizer application fosforo gestion du sol manejo del suelo phosphate fertilizers phosphore phosphorus plant production soil analysis soil chemistry soil deficiencies soil fertility soil management technique des traceurs tracer techniques