Effect of Biostimulants on Leafy Vegetables (Baby Leaf Lettuce and Batavia Lettuce) Exposed to Abiotic or Biotic Stress under Two Different Growing Systems

Plant biostimulants are substances or microorganisms aimed at promoting plant growth by increasing the mineral nutrition efficiency, tolerance to environmental stress, and crop quality traits. This new category of inputs has been capturing interest both researchers agriculture takeholders in light promising effects they could have on productivity sustainability. study investigated a variety for their effect germination rates, health, chlorophyll fluorescence parameters, SPAD index, baby leaf lettuce Batavia submitted biotic (absence/presence Pythium ultimum growing medium) abiotic (0, 40, 80, 120 mM NaCl L?1 concentrations ?0.5, ?2, ?4, ?6 kPa water potentials) stresses when grown greenhouse under conventional organic cultivation. The results obtained show that response was influenced type level stress applied system used. tested varied from strongly detrimental beneficial.