Characterization and management of phosphorites in agroecosystems

What do we know and what do we need to know?

1. How to evaluate the agronomic quality of directly applied phosphorites?
2. Results of experiments in the greenhouse and in the field to evaluate the efficiency agronomy of the phosphorite from Bahía Inglesa (Chile) in Argentine soils
3. Current panorama and trends in the use of phosphorites in the Southern Cone; empty of scientific and technological knowledge.