اثر سطوح مختلف کود گوگرد و تیوباسیلوس بر عملکرد بوته و برخی صفات آفتابگردان

To study the effect of different levels of sulfur and thiobacillus on yield, yield components, plant height and leaf numbers of sunflower, an experiment as factorial based on randomized complete block design with three replications was conducted on farm of Gonbad University. In this research Hayson 25 cultivar were used. The first factor was sulfur rate in four levels of none application of sulfur (S0), 200 kg sulfur per
hectare (S1), 400 kg sulfur per hectare (S2) and 600 kg sulfur per hectare (S3) and second factor was thiobacillus bacteria in four levels of none application of thiobacillus bacteria (T0), 10 kg thiobacillus per hectare (T1), 20 kg thiobacillus per hectare (T2) and 30 kg thiobacillus per hectare (T3). Results showed that the effect of sulfur rate on plant height, 1000-seed weight and plant yield were significant at 5٪. The effect of inoculation with thiobacillus on plant height at 1٪ and on number of rows in capitol, 1000-seed weight and plant yield were significant at 5٪. The interaction of sulfur × thiobacillus was not significant for any of the traits. The maximum values of all traits were obtained from high amounts of sulfur and thiobacillus.