by A Bargaz 2018 Cited by 148 — Likewise, fixation rates up to about 20 kg N ha-1 were estimated through a long-term Moreover, the impacts of a slow release plant fertilizer (containing NPK supplied with mineral (single super phosphate and rock phosphate) and in solubilization of rock phosphates. Pak. J. Biol. Sci. 15 1144–1151.