RESPONSE OF WHEAT PLANT TO SOIL SALINITY AND FOLIAR APPLICATION TREATMENTS OF ORGANIC COMPOUNDS.

A pot experiment was carried out under different soil salinity (0, 2500, 5000 and 6500ppm), to investigate the effect of foliar application of salinity relief organic compounds; salicylic acid (0.15, 0.25 g/l), glycine betaine (0.6, 0.9 g/l) and humic acid (0.25, 0.35 g/l) sprayed twice (30 and 60 days after sowing) on morphological traits and growth parameters of wheat (Triticum aestivum L.) var.?Gemiza7?. The interaction between the organic compounds and the adopted soil salinity was investigated. The results indicated that there are negative relationships between salt stress degree and plant growth characters i.e. plant height, number of tillers per plant, average leaf area and shoot fresh and dry weight. The three applied organic compounds significantly increase the averages of the morphological studied characters. Relative to the control, the average scored increases in average plant height due to organic acids treatments were, 10.7, 11.3 and 12.2% for salicylic, glycine betaine and humic acid treatments, respectively. The corresponded recorded percentages for average number of tillers were, 17.5, 40.0 and 10.0% for the same organic acids treatments arranged in the same order. Same trends were obtained in case of average leaf area. The average scored increases, relative to the control, in average plant fresh and dry weights due to organic acids treatments were, 5.1, 5% for (SA), 19.5, 22.7% for (GB) and 8.1, 6.3% for (HA) treatments arranged in the same order. The most common outcome was the compensating and salinity osmolytes effect on the reduction occurred due to salinity of the studied morphological traits.