Growth, photosynthetic pigments, and photochemical efficiency of sour passion fruit as a function of the cationic nature of water

The objective of this study was to evaluate the growth, photosynthetic pigments, and photochemical efficiency sour passion fruit cv. BRS Rubi do Cerrado irrigated with waters different cationic natures. experiment carried out from March 2019 January 2020 in a protected environment belonging Academic Unit Agricultural Engineering Federal University Campina Grande (UFCG), Grande, PB, Brazil. treatments consisted eight combinations irrigation water natures: S1 - Control; S2 Na+; S3 Ca2+; S4 Mg2+; S5 Na+ + S6 S7 Ca2+ Mg2+, S8 Mg2+. Plants control treatment (S1) were using an electrical conductivity (ECw) 0.4 dS m-1, while other (S2; S3; S4; S5; S6; S7; S8) subjected ECw 3.5 m-1. Sour growth affected by variations level conductivity, regardless nature water. use salinized sodium favored synthesis chlorophyll a, b, carotenoids plants at 180 days after transplanting. distinct natures did not influence fluorescence variables fruit.