The effect of plant growth regulators applied in different periods on yield and quality in bread wheat

The study was carried out in the experimental area of TNKU Faculty of Agriculture, Department of Field Crops in the growing season of 2019-2020. Bread wheat varieties, which have different maturing characteristics such as Golia, Lider and Rebelde in the study were used as materials.Three different hormones (IAA, BAP, GA3), four different doses (0,25,50,75) and four different hours (3,6 and 9 hours)in laboratory conditions were applied to the seeds of three bread wheat varieties. In laboratory conditions, root number, root length, root weight, shoot length and shoot weight were examined. In field conditions, three different hormones (IAA, BAP, GA3) and four different hormone doses (0,25,50,75 mg) were applied to the growing plants. Plant height, spike height, thousand grain weight, grain yield and quality characteristics were investigated in field conditions. According to the results obtained in the laboratory condition, it was determined that hormone application, hormone dose and hormone hour applications had a significant effect on root and shoot characteristics The highest values on the number of roots were obtained with the application of 50 mg dose of IAA hormone for 6 hours. The highest values in root length are at 25 mg dose and 3 hours application of GA3 hormone.In root weight, the highest values were obtained in 25 mg dose and 3 hour applications of GA3 and IAA hormones. While the highest value in shoot length was obtained in 25 mg 6 hours application of GA3 hormone, it was found in 25 mg dose and 6 hour application of GA3 hormone in shoot weight. In terms of root properties of wheat, 25 mg dose and 3-6 hour applications of IAA hormone and 25 mg dose and 6 hour application of GA3 hormone were determined to be the most effective in terms of shoot properties. While the highest grain yield is obtained in IAA and BAP applications (BAP: 775.31 kg/da, IAA: 767.28 kg/da) in hormone and hormone dose applications performed in field conditions, the highest value as hormone dose is obtained in 50, 75, 25 dose applications, respectively. Plants that were not treated with hormones gave statistically the lowest values. When the quality characteristics are examined, it has been determined that hormone applications have a significant increasing effect on normal sediment and protein ratio, which are important quality criteria.