poster - International Conference of Agricultural Engineering

2. Material and Methods
The experiment was conducted in a protected environment of the Unidade Acadêmica de
engenharia Agrícola (UAEAg), Centro de Tecnologia e Recursos Naturais (CTRN),
Universidade Federal de Campina Grande (UFCG), Campus I, in Campina Grande, PB (7 °
15 '18 'S, 35 ° 52'28 "W, 550 m) in plastic pots with 150L capacity, drilled in the base to allow
leaching. The pots were filled with a sandy loam soil material, no salt and no sodium.
Treatments consisted on five levels of salinity, called S1, S2, S3, S4 and S5, corresponding
respectively to the electrical conductivity of irrigation water (electrical conductivity) of 0.8,
1.6, 2.4, 3.2 and 4.0 dS m -1 at 25 o C, designed in randomized blocks with five treatments and
six replications. The irrigation water were prepared by adding NaCl (without iodine) to the
water supply system location, multiplying the desired value of the electrical conductivity (dS
m -1 ) 640, as Richards (1954). Irrigation, drip, were taken every three days early in the
morning, based on water consumption in the previous irrigation of the plants, dividing the
estimated volume by a factor of 0.8, reestablishing thus the moisture soil to field capacity
and using a leaching fraction (FL) of 0.2. Plants subjected to salt stress during fruiting were
irrigated with water of lower salinity (0.8 dS m -1 ) during periods of vegetative growth and
flowering. At the end of the first production cycle, we evaluated the content of chloride and
sodium in the roots, rootstocks, grafting and branch and leaves. The sodium was determined
by Flame Photometer according to the methodology suggested by Silva (1999) and chloride
by titration with AgNO 3 . For Na in the roots, rootstocks, grafts and branches, the values were
transformed into .. Data were analyzed using analysis of variance test with 'F'
(SISVAR, 2003). We conducted polynomial regression analysis, being a factor of salinity
quantitative.
3. Results and Discussion
It is noted in Table 1 that the effect of saline irrigation water on the chloride content was
highly significant (p