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The aim of this work was to describe aspects related to onion cultivation through bibliographical research in books, magazines, articles and theses, as well as the implementation of experiments in the area of soil fertility, management and nutrition of the onion crop. During the 2011/2012 harvest, different experiments were set up at EPAGRI - Ituporanga-SC Experimental Station (EEITU) to evaluate the response to phosphate, potassium, organic and organo-mineral fertilization, with the aim of obtaining regional fertilization and fertilizer management recommendations. To this end, two experiments were carried out with increasing doses of phosphorus (0, 50, 100, 200, 400 and 800 kg ha-1 ), in soil with different levels of P. One experiment was for potassium (0, 50, 100, 200, 400 and 800 kg ha-1 ); one of Potassium (0, 50, 100, 200, 400 and 800 kg ha-1) and an experiment with organo-mineral fertilization (0, 4500, 9000, 18000 kg ha-1 of poultry manure, mineral fertilization (NPK) 100,120, 90 kg ha-1 respectively, and poultry manure + mineral fertilization (NPK) in addition to organic fertilization. The results were satisfactory and will be presented in the course of the work.