Water Depths and Nitrogen Rates on the Physiological Quality of Cotton Seeds Produced in the Arenito Caiua Region

This work aimed to analyze the effect of water depths and nitrogen rates on the productivity and physiological quality of cotton seeds produced in the Arenito Caiuá region. In addition, it is expected to verify if it is possible to obtain quality seeds when they are produced in a low-altitude region. For this purpose, cotton seeds were sown, with a population of 122 thousand plants per hectare. The treatments consisted on the application of three nitrogen rates (30, 60 and 90 kg/ha) and four irrigation depths (0%, 50%, 100% and 150% of crop evapotranspiration), applied to the soil. When ripe, the seeds were harvested and manually delinted, and productivity was measured. Analyzes were also carried out to investigate the physiological quality of newly harvested seeds and six-month stored seeds. It was observed that the water depths and nitrogen rates applied to plants affect productivity, but not the physiological quality of the seeds. Furthermore, it is possible to obtain high quality seeds in a low-altitude region.