Initial growth of rope black bean under different doses of nitrogen

The bean crop is largely grown in the Northeast largely by small farmers. It is a culture quite demanding on nutrients like nitrogen mainly in the vegetative phase, however, the string bean black, the level of demand is somewhat elucidated. Through this work aimed to study the influence of nitrogen fertilization on the growth of the black string bean. The experiment was conducted in an area belonging to FATEC Cariri Juazeiro - CE, using five levels of nitrogen (0, 22.5, 45, 67.5 and 90 kg ha-1 urea) and three times collections, composing a split plot with three replications. The variables analyzed were height and stem diameter, fresh blade, stem and root. The doses of urea applied and the collection time significantly affected the height and stem diameter. The responses of the variables were adjusted significantly to the model school for the urea dose and the linear model for sampling times. The highest dose of nitrogen provides the highest performance vegetative culture of black beans.