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The objective was to evaluate the effect of foliar fertilizer on improving productivity and onion bulb size classification. The test was set up and conducted in Monte Alto (SP), being held in its commercial cultivation. The onion hybrid used was Cristalina, which was planted on May 12, 2014, with seeder 4 double lines, and the harvest was held on September 24, 2014. For the assay was employed a randomized block design treatment with four foliar Fertilizers were used, the Liqui-Plex Unix (1.0 L h-1), the organomineral (1.0 L h-1), and the organomineral B (1.0 L h-1) and untreated application with 5 repetitions, consisting of plots of 7.75 m2. Five applications were performed in 14-day intervals starting with 34 days after planting application. The number bulbs weight and onion bulbs size classification was quantitated. For the final assessments were harvested plants of 3.10 m2 of the central part of each portion. Treatment with Unix Liqui-Plex resulted in an increase of productivity and the amount of class onion bulbs 3 and 4. [ABSTRACT FROM AUTHOR]