The effect of salicylic acid application on yield and yield components of corn (Zea mays L.) in drought stress condition

In order to evaluate the effects of salicylic acid application on yield and yield components of corn under drought stress condition a split plot experiment was carried out in 2010 based on randomized complete blocks design with 3 replications. Treatments consisted of 3 irrigation intervals (4، 6 and 8 days) as a main factor and application of salicylic acid in 4 levels (0، 0. 4، 0. 7 and 1 Mm) as a second factor. Characters under examination were LAI، leave praline content، weight of thousand grain and grain yield. Most important factor for limiting the agricultural products is environmental stresses the most important of is the lack of water. The results indicated that salicylic acid could significantly affect LAI، rate of leave proline، weight of thousand grain and grain yield. Main comparisons indicated that the hormone with concentration of 1 Mm in all irrigation intervals caused significant increasing on characters under examination. However concentration of 1 Mm hormone with irrigation interval at 4 days has the most effect on accretion among all qualities. In this examination it was observed that the effects of stress like reduction area leaf was controlled by concentration of 1 Mm hormone. Therefore، according to the results in this experiment the concentration of 1 Mm of salicylic acid can cultivate corn and is suitable in the region with shortage of water to reach to high yield.