Níveis de salinidade e manejo da fertirriga？？o sobre características da berinjela cultivada em ambiente protegido

the objective was to study the effects of different levels of soil salinity on the phenological variables and production of the eggplant when grown in pots in a protected environment. the study was carried out at the experimental site of the department of biosystems engineering esalq/usp in piracicaba, s？o paulo. the treatments consisted of a combination of two factors: six initial levels of soil salinity (s1 = 1.3, s2 = 2.4, s3 = 3.6, s4 = 4.5, s5 = 5.6 and s6 = 6.4 ds m-1) and two fertigation management: with the electrical conductivity of the soil solution being controlled (m1) and traditional (m2), following the absorption curve of nutrients from the culture. the statistical design adopted was a randomized complete-block design with four replications, arranged in a 6 x 2 factorial. the results showed that the levels of soil salinity directly affected the variables of dry-matter production, fruit production and leaf-area index of the plants. it was found that the average reduction in yield of the eggplant crop in a greenhouse, was approximately 8.65% for an increase of 1 ds m-1 in the salinity of the soil above the threshold salinity of 1.71 ds m-1.