FRANÇA, G. M.; http://lattes.cnpq.br/0661906391252675; FRANÇA, George Martins de.
Résumé:
Soil salinity is one of the most limiting factors for plant growth and their ability to survive
under these conditions is important for their geographic distribution, forestry and
agricultural production in salinized regions. This work aimed to verify the physiological
behavior of ‘jurema-preta’ saplings under salinity conditions. The experiment was
carried out in the forestry nursery of the Academic Unit of Forestry Engineering/UFCG,
with the plants kept in 'leonard' pots. The salinity treatments were distributed in a
completely randomized design, with five levels of electrical conductivity (EC) of the
nutrient solution (0.5; 2.0; 3.5; 5.0 and 6.5 dS m-1), and four replications. The salinity
of the solution was achieved by adding a mixture of NaCl, CaCl2.2H2O, and
MgCl2.6H2O salts. At 210 days, plant height and diameter parameters, height growth
rate, stomatal parameters, relative water content and dry mass production were
evaluated. The salinity affected the changes of ‘jurema-preta’, decreasing all the
analyzed parameters. The transpiration rate was less sensitive to salinity than stomatal
conductance and photosynthesis. Among the growth parameters, the roots showed
greater sensitivity to the employees' salinity levels.
