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Effect of various NaHS concentrations on chlorophyll content in a dose-dependent manner in iron-deficient maize plants. Maize seedlings were pre-treated with 0, 10, 100, 500, and 1000 µM NaHS for 8 d and then grown hydroponically in a nutrient solution containing 50 µM Fe(III)-EDTA for 12 d. Chlorophyll content in the fourth leaves was measured. Data are presented as means ± SE. Columns labelled with different letters indicate significant differences at P<0.05.
