Tolerância de mudas de lima ácida ‘Tahiti’ em distintos porta-enxertos à salinidade da água

Abstract

Citriculture plays a fundamental role from the social and economic point of view, being produced in almost all the national territory general employment and income to small, medium and large producers. The semi-arid and arid regions of Brazil are characterized by water deficiency and irregular distribution of rainfall and, therefore, the production system necessarily depends on irrigation, which does not always provide good quality water. The objective of this study was to study the tolerance of 'Tahiti' lemon seedlings with different rootstocks of the Florida Sunki (TSKFL) and Poncirus trifoliata Beneke (TRBK) crosses irrigated with salinized waters during the crown formation / Rootstock greenhouse phase. The experiment was carried out in a protected environment (greenhouse) of the Center for Science and Technology Agro-Food of the Federal University of Campina Grande (CCTA / UFCG), located in the municipality of Pombal-PB. The experimental design was a randomized complete block design and treatments arranged in a 2 x factorial scheme (19 + 3), related to two irrigation water salinity levels (0.3 and 3.0 dS m-1) and 22 combinations/Genotypes. Four blocks were used, with one useful plant per plot, totaling 44 treatments and 176 plots. The increase of water salinity increased the electrical conductivity of the saturation stratum and the contents of soluble salts in the substrate. Irrigation with saline water reduced the phytomass accumulation of citrus genotypes, with the exception of TSKFL X TRBK - 19, TSKFL X TRBK - 24, TSKFL X TRBK - 30, TSKFL X TRBK - 39, TSKFL X TRBK - 43, LCRSTC, LVK X LCR-038, identified as salinity tolerant. The combination of 'Tahiti' with TSKFL X TRBK - 41 and SUNKI TROPICAL was considered sensitive to salinity among the studied materials.