Small plot experiments were carried out to examine the characteristics correlated with the water circulation including stomatal resistance, stomatal density and leaf area index (LAI) and yield components of super sweet corn hybrids with different ripening under optimum water supply, moderate water deficit and non-irrigated conditions. High stomatal resistance and stomatal density contributed to significant decrease of plant height, as well as diameter and weight of ears of sweet corn hybrids grown under non-irrigated conditions. Moderate water deficiency did not decrease the individual weight of ear in comparison with the well-irrigated plants, except the late-ripening GSS 2259 hybrid. During tasselling, LAI values of late-ripening hybrids decreased by 9 and 19% using deficit irrigation but it was not changed for mid-early ripening one. The evaluation of water tolerance of sweet corn genotypes is efficient during tasseling, under moderate water deficiency that based on the significant correlation between stomatal resistance and weight of husked ear (r=0.69). During silking, under nonirrigated dry conditions, the correlation between the stomatal resistance and weight of husked ear (r=0.61) as well as LAI and weight of husked ear (r=0.80) make the possibility to select genotypes with water stress tolerance.

Keywords: sweet corn, stomatal resistance, stomatal density, irrigation