Summary

Extensive research on the agronomic potential and actual effectiveness of phosphate rocks (PRs) as sources of phosphorus has been carried out in Africa, Asia, Latin America and elsewhere. A wealth of information is available, but it is scattered among meeting proceedings, technical reports and scientific and other publications. This bulletin gives comprehensive coverage of the keys topics regarding the utilization of PRs in agriculture, including the latest information on PR research, and provides guidelines for the direct application of PR (DAPR) to the acid soils of the tropics and subtropics.

This publication can be downloaded from:

-English:?ftp://ftp.fao.org/docrep/fao/007/y5053e/y5053e00.pdf

-French:?http://www.fao.org/docrep/007/y5053f/y5053f00.HTM#Contents

-Spanish:?ftp://ftp.fao.org/docrep/fao/010/y5053s/y5053s.pdf