Importance of penetration through stomata in the correction of chlorosis with iron salts and low‐surface‐tension surfactants

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Abstract
Lime‐induced chlorosis was corrected only when the abaxial (under) surfaces of orange (Citrus sinensis L.) leaves were treated with FeSO4, indicating stomatal penetration of Fe. The fact that no correction was achieved when the adaxial (upper) surface were treated indicates that low‐surface‐tension surfactants cannot penetrate into the adaxial cuticle.