Low-grade phosphate rocks have no direct use and are rejected worldwide. In this work, a method is described for the production of ammonium phosphate containing fertilizers from apatite which is generally unsuitable for use in the wet process in phosphate industries. Under the beneficial route, by the minimum use of mineral acids, various experiments have been carried out to develop methods for the production of ammonium phosphate containing fertilizers from low-grade phosphate rocks. It has been found that low- and/or medium-low-grade phosphate rocks may be used for useful products containing diammonium phosphate fertilizers with different percentages of P2O5 content depending on acid, particle size, and the nature of the phosphate rocks.