Morphophysiology of passion-fruit seedlings in different substrates under different strategies of irrigation with brackish water

The presence of salts in the irrigation waters semiarid region negatively affects production seedlings. Thus, substrates based on carbonized rice husk are an alternative for saline environments, associated with management strategies brackish water. This study evaluated physiological responses yellow passion-fruit seedlings as a function water different substrates. was developed at Universidade da Integração Internacional Lusofonia Afro-Brasileira, Redenção, Ceará. design entirely randomized, 2 × 5 factorial scheme two substrate compositions (S1 - soil; S2 – sandy soil, sand and 1:1:1 volume basis) five (IS1 low salinity during entire cycle 1-65 days after sowing (DAS); salt stress initiation at: IS2 11 DAS; IS3 16 IS4 21 IS5- 26 DAS), repetitions. Soil efficient photosynthesis chlorophyll. It also provided better results transpiration, stomatal conductance leaf area regardless strategy. Internal carbon concentration use efficiency were higher soil 11, DAS. Under same substrate, stem diameter greater when irrigated lower phase. composed is seedling height increased temperature.
 Keywords: plant physiology, Passiflora edulis, salinity, substrate.