Improving growth,yield,physiological characteristics and nutrients uptake of growing sunflower (helianthus annuus I.) Plants in saline soil by using ascorbic acid

A field experiment was conducted in saline soil, to illustrate the leverage of ascorbic acid on growth, yield, nutrients uptake and physiological characteristics of Sunflower(Helianthus annuus L., cv Sakha53) plants. Three site of soil differed in salinity were chosen, and which the levels were (4, 7 and 12 dS m(-1)). Three rates of ascorbic acid (0, 0.5 and 1.0mM) were spattered on plants twice at 30 and 45 days from sowing. The results appeared that all growth and yield ingredients of sunflower plants increased significantly when ascorbic acid splashing from 0.5 to 1.0 mM under soil salinity levels. Therefore, ascorbic acid reduced soil salinity effects on plant growth and encouragedgrowth and yield of sunflower plants. The improvement of physiological characteristics (chlorophyll a and b, carotenoids, total carbohydrate,protein and proline)values by spraying ascorbic acid was 17.1, 17.0, 25.6, 3.28, 14.9 and 12.5% respectively, under faint soil salinity level (4 dS m(-1)), but The improvement of physiological characteristics (chlorophyll a and b, carotenoids, total carbohydrate,protein and proline)values by spraying ascorbic acid was 19.9, 20.0, 21.9, 12.9, 11.0 and 28.6 % respectively, under high soil salinity level (12 dS m(-1)). Increasing ascorbic acid spraying level from 0 to 1.0 mM increased significantly all nutrients uptake (N, P, K, Ca, Mg, Na and CI) mg/kg plant under dissimilar levels of soil salinity.Salinity stress bring about a significant lessening in growth, yield, physiological characteristics and nutrients uptake, but spraying ascorbic acid helps to boost the tolerance ofsunflower plants to high soil salinity, especially under the concentration of 1 mM.