FERTIRRIGAÇÃO NITROGENADA E NÍVEIS DE HIDROGEL PARA A CULTURA DA ALFACE IRRIGADA POR GOTEJAMENTO

after transplanting. During the lettuce cycle, irrigation management was based on monitoring the water status of the soil using a soil moisture sensor. The variables evaluated were: number of leaves, diameter of shoot, stem diameter, fresh and dry mass of shoots and efficiency in water use. For data analysis, the analysis of variance and regression evaluations were conducted. It was concluded that doses of hydrogel linearly influence the efficiency of water use by lettuce. The fresh and dry weight of the shoots presented maximum values with the nitrogen doses of 123.04 and 118.51 kg ha -1 , respectively.