The corn is characterized by a high biological plasticity, climatic factors, temperature and humidity, exerting a great influence on its growth and development. Being a plant of origin in southern and warm regions, the stages of development are generally short, except for late varieties whose light stage is longer. In order to break the correlation between productivity and tardiness, we have applied a very rigorous selection of the genitors, but also a special selection for the very fast traverse of the flowering vegetation phases. Hybrids must present a larger number of leaves in the late forms, increasing their character from 8-10 leaves, as in early forms at nearly 20-24 leaves, as in late forms. Varieties and hybrids intended for cultivation in irrigated areas must have specific features. Thus, it has to support high densities at the surface unit. For this, they must be resistant to falling, less demand of light, very resistant to disease attack, and able to valorise high doses of fertilizer. Sugar corn is also important through its production, especially through the productivity of hybrids created by breeding. It is a plant of great biological capacity. The importance of the sweet corn breeding in our country results both from the pedoclimatic conditions that are favourable for its culture and from the necessity to create hybrids with an ever-increasing production capacity and better quality. The use in production of hybrid seeds and the application of the most suitable agro technical methods provide year-to-year higher yields.
