Selenium Uptake by Lettuce Plants and Se Distribution in Soil Chemical Phases Affected by the Application Rate and the Presence of a Seaweed Extract-Based Biostimulant

To tackle selenium (Se) malnutrition, biofortification is among the proposed strategies. A biostimulant application in soils thought to support a plant’s growth and productivity. Biofortification with Se(VI) may lead leaching hazard due high mobility of soil environment. In this study, effect two rates—5 10 mg kg?1 soil—and on Se uptake by lettuce plants distribution fractions following harvest, was investigated. Phosphorus (P) sulfur (S) concentrations were also determined. rate suppressed plant growth, leading significant fresh weight decrease from 12.28 7.55 g 14.6 2.43 for control without biostimulants, respectively. Impaired verified SPAD, NDVI NDRE measurements. The significantly highest concentration plants, 325 kg?1, recorded presence biostimulant. Compared controls, low decreased P increased S plants. post-harvest fractionation revealed that, biostimulant, soluble fraction 0.992 1.3 at rate, 3.T85 3.13 rate. Nevertheless, 3.6 3.1 added remained less mobile forms, or absence This study indicated that exogenous exerted dual effects availability, depending level selenate applied.