BATISTA, M. C.; http://lattes.cnpq.br/0545464390582078; BATISTA, Mateus Costa.
Resumo:
With all the problems of water scarcity in the semi-arid region of Paraíba,
the irrigation technique using good quality water resources becomes impracticable in
these regions, most of the time producers subject to the use of groundwater usually
brackish potentize the process of salinization of areas the hydroponic system emerges as
an opportunity for sustainable production by adding crops of high commercial value such
as tomato. Thus, the objective of this research was to evaluate the effects of different
levels of salinity on the hydroponic cultivation of cherry Tomato cultivars. The
experiment was carried out at Fazenda Riachão in the municipality of Boa Vista-PB, from
March 20 to May 25, 2018, in an open environment. The experimental design used was
subdivided into five plots (saline concentrations), and each parcel had 4 subplots where
the last net was 3 cultivars, the factors studied were arranged in a 5 x 3 factorial scheme,
three cultivars of cherry tomato; Carolina, Fernão and Vermelho, treated in five saline
levels of the nutrient solution (2.5, 4.0, 5.5, 7.0 and 8.5 dS.m-1), after 10 days of
transplanting to the final profiles. Growth variables, photosynthetic pigments, electrolyte
extravasation, relative water content and gas exchange at 15 and 30 days after the
beginning of treatments, phytomass and net production were evaluated. The results show
that the effect of salinity on the cultivars reduces the growth parameters consequently the
green and dry mass of the plants, decreased the values of the photosynthetic pigments
with the persistence of saline stress, the photosynthesis of the plants was satisfactory until
the second concentration of 4.0 dS.m-1, where the cultivar Samambaia reached higher
production with 4.7 dS.m-1, behaving more tolerant to saline stress in relation to the
others.