Field experiments tested different phosphate fertilizers on various types of soils. Rock phosphates were less efficient than superphosphate for swedes and turnips on very acid soils. Gafsa phosphate was as effective as superphosphate for swedes on acid soils but less effective for potatoes. Rock phosphates were somewhat effective for grassland but inferior to high-soluble basic slags. Mixtures of rock phosphate with superphosphate were not more efficient. Silicophosphate was effective for swedes on very acid and acid soils. Dicalcium phosphate was equivalent to superphosphate for swedes on all soils.