<div>Background: Salinity stress limits soybean (Glycine max) productivity by impairing growth, photosynthesis and cellular balance. This study evaluated Stachytarpheta jamaicensis (L.) Vahl leaf extract (SjE) as a natural biostimulant to mitigate salinity stress. 
 
Methods: Soybean plants were exposed to 100 mM NaCl (SS-100) and treated with SjE (10% and 25%) via soil drenching. Growth, photosynthetic pigments, oxidative markers (LPO, H2O2) and antioxidant enzymes (SOD, CAT, POD) were assessed. 
 
Result: Salinity reduced growth and pigments while increasing oxidative damage. SjE, especially at 10%, improved growth, restored pigments, reduced LPO and H2O2&nbsp;and enhanced antioxidant enzymes. These effects are linked to phenolics and flavonoids. Overall, 10% SjE showed optimal performance, highlighting its potential as an eco-friendly biostimulant for salinity stress tolerance. 
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Mitigation of Salinity Stress in Soybean [Glycine max (L.) Merrill] using Exogenous Soil Drenching with Stachytarpheta jamaicensis (L.) Vahl Extract