Effect of foliar application of potassium silicate and zinc sulphate on some physiological parameters of two grapevine cultivars under salt stress conditions

Document Type : Full Paper


1 Ph.D. Student, Faculty of Agriculture, Urmia University, Iran

2 Professor, Faculty of Agriculture, Urmia University, Iran

3 Associate Professor, Faculty of Agriculture, Urmia University, Iran

4 Associate Professor, Faculty of Sciences, Urmia University, Iran

5 Associate Professor, Agricultural and Natural Resource Research Center, West Azerbaijan, Urmia, Iran


To study the effects of salt stress on some physiological parameters of grapevine and the effect of foliar application of potassium silicate and zinc sulphate in alleviating saline effects, a pot experiment was conducted under greenhouse condition. Rooted sapling of two grapevine cultivars, ‌‘Rasha’ (salt-tolerant cultivar) and ‌‘Bidaneh ghermez’ (salt-semi sensitive cultivar) were subjected to different NaCl concentrations (0, 50 and 100 mM) and foliar application of potassium silicate (0, 150 and 300 mg/l) and zinc sulphate (0, 2 and 4 g/l) in hydroponic conditions. The experiment was conducted using a factorial design (cultivar, salinity levels and foliar application as factors) based on randomized complete block design with three replications. The results showed that relative water content, photosynthesis, stomatal conductance, transpiration and chlorophyll content decreased with increasing salinity level. The reduction of physiological parameters in ‘Rasha’ was less than ‘Bidaneh ghermez’. Foliar application of different concentrations of potassium silicate and zinc sulphate increased relative water content, photosynthesis, stomatal conductance, transpiration and chlorophyll content in both cultivars. The most effective treatment was potassium silicate 300 mg/l + zinc sulphate 2 g/l, so that at the highest salinity level (100 mM) relative water content, stomatal conductance and photosynthesis in this treatment was 13.75%, 91.14% and 47.56% more than no foliar application treatment, respectively. According to the results of this study foliar application of potassium silicate and zinc sulphate can be used to alleviate salinity effects in grapevine.


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