however, there is a enormous contrast in productivity among different regions of the country,
due to the different climates and cultivation conditions to which culture is submitted. The cultivation of this cereal is well adapted to tropical and subtropical regions, however, [1] emphasized that the yield of corn in the
northeastern region is low, because of the predominance of production systems that use little or no technology
and there are usually, in this region, failure and irregular rainfall. Corroborating this idea [2] pointed out that the
failure or irregular distribution of rainfall is a major factor limiting agricultural production in Brazil, yet occurred in recent years, a significant increase in the cultivation of maize under irrigation.