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In recent years, increasing environmental stresses such as salinity have had a significant impact on the quantitative and qualitative of agricultural products. In order to evaluate using plant growth stimulants in reducing salinity stress on wheat, a study with seven treatments including control, seed treating (before planting), Humic acid (at a rate of 5 kg/ha (with the second of irrigation and tillering as fertigation), Fulvic acid (in tillering and stem elongation at a rate of 5/1000 as foliar application), Seaweed extract (tillering and stem elongation at a rate of 5 1000 as foliar application) and combined treatments of growth stimulant (except for folic acid), were conducted in three replications in the saline soils of Khuzestan, Isfahan and Qom provinces to a randomized complete blocks design and also greenhouse experience in Alborz province (Karaj) in a completely randomized design in two cropping years 2017-2019. The results in Khuzestan and Qom showed that the use of plant growth stimulants were effective on wheat characteristics. However, according to the soil conditions of the regions (salinity), the effect of plant growth stimulant treatments were different, so that in Khuzestan regions with an average salinity of 8 dS/m, Humic acid treatment with increasing about 1378 kg/ha compared to the control had the most yield. In Qom region with an average salinity of 13 dS/m, the most yield was gained the combined treatment with an increase of 834 kg/ha compared to the control. In Isfahan region with an average salinity of 10 dS/m, the results of treatments in the first and second year showed non difference between treatments on seed yield. Using of growth stimulant treatments except Qom region had no significant effect on nutrient concentration during wheat growth period. Greenhouse results showed that the effect of plant growth stimulants on the characteristics of dry weight, root dry weight, shoot weight, root weight, shoot sodium and potassium concentration, shoot sodium to potassium ratio and proline content was significant (p<0.05). The effect of both salinity tension and growth stimulants on root and shoot dry weight, root and shoot fresh weight was not significant. The interaction effect of salinity stress and growth stimulants on sodium, potassium and sodium to potassium ratio of shoot and proline concentration were significant (p<0.05). Under salinity stress, the use of humic acid had the highest benefit-to-cost ratio, and the use of seed with a benefit-to-cost ratio of 4.53 was the next priority. Other plant growth stimulants were amino acid, fulvic acid, seaweed extract and finally combination treatment, respectively. Finally, according to the results of this study, using plant growth stimulants can improve crop production and sustainability. Also, the type of effective plant growth stimulants was different in each region butd reduced the effects of salinity tension. So, the use of appropriate plant growth stimulants is recommended for each region based on existing research findings.Key words: Growth biostimulants, salinity, wheat, concentration of nutrients, regions.
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