THE PROGRESS OF STUDIES ON CONTROLLED AVALIABILITY FERTILIZERS

In pace with deepening with our know on the economic loss andenvironmental pollution caussed by the loss of the conventional chemical fertilizers insoils, controlled availability fertilizers (CAFs) have become as the hotpoint in theresearch and development of chemical fertilizers. A detail review was given on theconcept, type, controlled-release materials, controlled- release behaviour and mechanismof CAFs, CAFs' efficiency and factors affecting it, as well as other aspects of the use ofCAFs. It is pointed out that the problems in the research of CAFs and the futuredirection to CAFs.