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Effect of foliar application of Si fertilizer on proline (A), soluble protein (B) and soluble sugar content (C) in wheat leaves at jointing, anthesis and filling stages under drought and normal conditions. +Si, Si addition; -Si, no Si addition; D, drought stress; CK, well-watered controls condition. Data are the means ± standard deviation (SD) of three replicates. Different letters (a, b, c) above the bars indicate statistical significance (p ≤ 0.05).
