The Effects of Humic Acid and Proline on Morphological Properties of Actindia Deliciosa cv. Hayward under Salinity

摘要

Background and Objective: The effects of soil application of humic acid and foliar application of proline on some morphological properties of kiwifruit grown at various salt concentrations were examined. Sodium chloride was added to the soil to obtain 25 and 50 mM saline conditions. The dissolved proline was sprayed on the leaves and the liquid humic acid was put into the soil pots three times on 15,30 and 45th day after Bud emerged. The application doses of humic acid were 0, 50 and 100 m g/l and the application doses of proline were 0, 0.1 and 0.2%. Three NaCl doses were 0, 25, and 50 mM and Each application consists of four replications. The experiment was conducted in pot experiment under controlled conditions in completely randomized factorial design.Results: Finding of this research showed that by increasing salinity levels, the amounts of relative humidity increased significantly. But salinity decreased leaf area at the low level of Nacl (25 mM) ,but increased at the high level (50 mM). Also, plant height, dry and wet weight increased at the salinity level of 25 Mm, but decreased at more level (50 mM). Also, the result showed that the usage of these organic acids were positive on plant height, wet and dry weight and relative humidity of leaf. conclusion: there are not many researches into humic acids and proline application and their effects on kiwifruit salinity tolerance. Therefore, more researchs is necessary to explain the positive effects of humic acid and proline on kiwifruit plants under salt stress.