Effect of Foliar Boron and Proline Applications on Physiological and Biochemical Properties in Soybean (Glycine max L.)

Background: In this study, boron which is an important element in many fields such as defense industry, energy, food and cleaning in the world, was studied. It is also an important plant nutritional element. However, like other important elements, it has some effects on plants and the environment. Türkiye has 76% of the world¢s boron reserves. In this study, proline applications were tried to determine the toxic effect of boron in soybeans, which is a strategic product and to reduce the damage. Methods:This study was carried out to determine the effects of boron (0, 2.5, 5 and 10 ppm) and proline (0, 10 and 20 ppm) applications on plant growth parameters and biochemical properties in soybean (Glycine max L.). The study was carried out in the fully controlled climate room of our faculty's field crops.This trial was carried out according to the randomized plots experimental design in a factorial arrangement with 4 replications. Result: In the research, after the applications, soybean plant height (22.7-33.3 cm), root length (26.2-38.7 cm), stem fresh weight (1.77-3.20 g), stem dry weight (0.59-0.71 g), root fresh weight (1.43-2.72 g), root dry weight (0.15-0.24 g), leaf area index (10.4-11.1 cm2), ion leakage in leaf tissues (20.4- 24.9%), nitrogen balance index (47.3-92.2 dx), anthocyanin (0.04-0.08 dx). flavonoid (34.9-55.6 dx) and chlorophyll (22.5-42.4 mg cm-2) were examined. In the results of working; Boron applications first increased and then decreased the values of plant height, root length, stem fresh and dry weight and root fresh and dry weight in soybean plants. There was a direct decrease in leaf area index, NBI and total chlorophyll values. Other parameters followed a fluctuating course. It has been determined that boron applications increase flavonoid and anthocyanin values. In this study, it was determined that proline applications had a positive and regulatory effect on root length, stem fresh weight, root fresh weight, root dry weight, nitrogen balance index and flavonoid values against boron toxicity.