The objective of this study was to evaluate the interaction of salinity of irrigation water levels associated with nitrogen doses on yield of eggplant crop. The experiment was conducted in a greenhouse of the Department of Environmental Sciences and Technology -UFERSA. The experiment followed a randomized block design in a 4 x 6 factorial, with four replications, with four levels of electrical conductivity of irrigation water (0.5, 2, 4 and 6 dS m-1) and six levels of nitrogen (5, 10, 15, 20, 25 and 30 g plant-1). Six measurements were conducted, in which the following variables were analysed: number of fruits, length, diameter and mean fruit weight, and total yield per plant. After statistical analysis of the data, it was verified that there was a negative effect of salinity on all variables. Nitrogen levels above 5 g plant-1 did not increase fruit yield of eggplant, and increased the deleterious effect of salinity on the yield of eggplant. The agronomic efficiency of nitrogen is reduced with increasing dose of N and salinity.
Solanum melongena L.; saline stress; nitrogen
