Figure 4.
Effect of soil amendment using biochar and K-humate foliar application on the stress biochemical indicators of onion plants grown in sodic-saline soil and irrigated regularly (Every 30 days) or stressed with deficit irrigation (every 45 days) during 2018/2019 and 2019/2020 seasons. (A) Malondialdehyde (MDA; nmol g−1 FW) and (B) H2O2 (µmol g−1 FW). Data presented are the means ± standard deviation (mean ± SD) of three biological replicates. Different letters signify statistically significant differences between treatments according to Tukey’s HSD test (pirrigation×treatment ≤ 0.05).