Foliar application of potassium nitrate induces tolerance to water deficit in pre-flowering sorghum plants

The objective of this study was to evaluate the ability foliar application potassium nitrate (KNO3) induce water deficit tolerance in sorghum plants (Sorghum bicolor cv. P898012) subjected at pre-flowering. experiment conducted under greenhouse conditions with 4 treatments: field capacity (FC), (WD), + KNO3 (FC KNO3), and (WD KNO3). Two applications 3% (m/v) were made, first on day zero stress second fifth day. All analyses performed after 12 days (end stress). Foliar irrigated led increases relative chlorophyll content, photosynthetic rate, stomatal conductance, transpiration, carboxylation efficiency. It also induced leaf concentrations P, Mg, S, Cu, Fe, addition height growth. Under conditions, treated presented higher area, efficiency, levels K, Fe than those not KNO3. morphometry root system altered by treatments. In addition, showed growth a grain yield 32.2% that did receive These results demonstrated applied leaves severe