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Response of some variables of vegetative growth of five onion varieties was evaluated in an experiment carried out between the years 2009-2010 at ̈Jorge Dimitrov ̈ Agricultural Research Institute, Bayamo municipality, Granma province, Cuba. Three soil moisture levels were evaluated: 100%, 75% and 50%. 15treatments were used, distributed in a completely randomized design and 10 plants were selected at random from each treatment where indicators were evaluated: Leaf length (cm), leaf numbers and false stem diameter (cm). The results showed that the soil hydric defficits evaluated have a significative on the variables of vegetative growth with a bigger effect in the level of 50% of humidity in the soil.