Irrigação com águas salinizadas na produção de mudas de cultivares de alface.

Abstract

The objective was to study the initial development and tolerance of lettuce cultivars submitted to different levels of saline water in the seedlings production stage. The experiment was carried out in a protected environment (greenhouse) at the Agricultural Science and Technology Center - CCTA of the Federal University of Campina Grande - UFCG, located in the municipality of Pombal, Paraíba, PB, from August to September 2014. They (C1 - Simpson Semente Preta, C2 - Alba, C3 - Mimosa Vermelha, C4 - Veneranda and C5 - Mônica Sf 31) and five levels of irrigation water salinity (0.6 (control), 1, 2, 1.8, 2.4 and 3.0 dS m-1), arranged in a factorial scheme, 5 x 5, under a completely randomized experimental design with four replications and five plants per plot, totaling 500 experimental plants. The plants were conducted in trays for 20 days after sowing, this period where the emergence, growth, phytomass accumulation and tolerance index of the lettuce cultivars were evaluated. The increase of irrigation water salinity reduced the emergence, growth and dry mass accumulation of lettuce plants, with cultivars C2- Alba and C4-Veneranda being the most tolerant to salinity. The tolerance to salinity presented the following sequence C2 - Alba = C4 – Veneranda > C1 - Simpson Black Seed > C3 - Red Mimosa = C5 - Mônica Sf 31.