Abstract
The expansion that crosses the cultivation of sunflower in Brazil, especially in the northeast of the country, elevates the need for information that increases the productivity rates of the crop. The objective this work was to study the growth of sunflower variety EMBRAPA 122-V2000, according to the average levels of water available (55, 70, 85 and 100%) in a Entisol eutrophic and nitrogen fertilization (0, 60; 80 and 100 kg ha-1 from urea 45% N). Theexperimental design was completely randomized in a factorial analysis (4 x 4) with three replicates totaling 48 experimental units. The results of the research were subjected to analysis of variance, comparing by means of regression analysis the nitrogen and levels of available soil water. It was found that the interaction between doses of nitrogen and medium levels of available water did not affect the growth of sunflower; all variables increased linearly with the increase of available soil water, being observed the highest rates of growth in plants irrigated with 85 and 100% of available soil water; the rate of 100 kg N ha-1 providedhigher growth rates.
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