Desempenho de porta-enxertos de umbuzeiro sob níveis de água salina

Abstract

The arid and semiarid regions of Brazil are characterized by irregular rainfall distribution, with evaporation rates higher than precipitation. This demands, for cultivation in these areas, the use of irrigation. Most groundwater has high levels of salts. As an alternative, it is necessary to know the tolerance of species with potential, such as the umbuzeiro, which is native to the region and has a good tolerance to drought. Thus, the objective was to study the growth of umbuzeiro seedlings under water salinity during rootstock formation. For this, umbuzeiro plants will be cultivated under irrigation with water of five salinity levels, corresponding to electrical conductivities of 0.14 dS m- ¹; 1.5 dS m- ¹; 3.0 dS m- ¹; 4.5 dS m- ¹ and 6.0 dS m- ¹. Which will be prepared from the dilution of natural brackish water with water from São Francisco River. Conducted in protected environment in EMBRAPA Semiarido experimental field of Gloria. With random block experimental design, containing five treatments that will be repeated in four blocks, each plot consisting of five useful plants, totaling 20 plots. Growth variables will be measured, such as stem diameter, petiole number, main stem length, dry biomass of stem, petiole, roots and Dickson quality index. The values of the growth variables will be submitted to the analysis of the Shapiro-Willk normality test at 5%, analysis of variance, linear regression. After interpretation of the results, it is expected to obtain Spondias seedlings tolerant to salinity up to 6 dS m-1.