Alleviation of Drought Stress in Soybean by Applying a Biostimulant Based on Amino Acids and Macro- and Micronutrients

Drought stress is one of the most predominant environmental factors hindering soybean productivity. Therefore, study stress-mitigating strategies, such as use biostimulants, important in order to mitigate this problem. This investigated effects an exogenous application biostimulants based on amino acids and macro- micronutrients physiological, biochemical productive responses cultivated under drought stress. Treatments consisted T1—dose 0.0 kg ha−1 (control); T2—dose (with water-deficit stress); T3—dose 0.25 ha−1; T4—dose 0.5 T5—dose 0.75 T6—dose 1.0 biostimulant. Application T4 maintained photosynthetic metabolism, with main action stomatal conductance, increased activity antioxidant enzymes superoxide dismutase by 420%, catalase 167% ascorbate peroxidase 695%. In addition, it levels proline 106%, leaf area 279% dry matter mass plants 26%, which was reflected a 22% increase studied biostimulant at dose recommended effectively alleviate adverse soybean.