Conclusion
The effects of foliar application of gibberellic acid (GA3), salicylic
acid (SA) and silicon (Si) on the nutritional content of
maize plant leaves (Zea mays L. CV.) have been compared
through a pot experiment using irrigation saline water. Chlorophyll,
macro- and micro-nutrients contents of the plant leaves
were estimated for the untreated and the treated plants by a
solution of GA3 and SA or Si. Gibberellic acid was found to
be the most effective for resisting the severe salinity effects
on the leaves chlorophyll followed by the Si then the SA. In
almost the same order, the Fe, Zn and Si toxicity due to the
salinity effects on the leaves could be reduced. Copper (Cu)
and manganese (Mn) deficiency may be controlled but to a
limited extent by SA then by GA3. Both materials enhanced
nitrogen (N) content of the leaves and potassium (K) to a
lower extent. But sodium (Na+) content as well as Na+/K+
ratio of the leaves was highly increased as affected by SA