Impact of potassium silicate on biomass yield and organic metabolites in Saltbush (Gtaff) under drought stress

The water deficit effects on growth parameters, protein content and proline level in the Gtaf (Atriplex halimus) plant were investigated using potassium silicate under three drip irrigation regimes (100, 75 and 50% of field capacity). Compared to the control, yield biomass estimated by the dry and fresh weight of the shoot decreased significantly at severe deficit irrigation levels. In contrast, the moderate-level treatment stimulated the growth. The silicate treatments mitigated the adverse effect caused by water deficit but at a moderate level. The concentration of protein in leaves decreased by decreasing water, while the reverse effect was observed with the application of potassium silicate. Medium treated with silicate of potassium increased the proline accumulation in leaves, especially at the higher deficit level. Under the potassium silicate treatment, the proline concentration dramatically rose in response to the higher stress level. At low deficit level, there was a slight, but not significant, decrease in this trait. Based on these findings, Atriplex halimus as an axero-halophytic shrub could be economical to use as animal feed materials and for the rehabilitation and revegetation of water deficit-affected lands.