Effect of Sulfur Fertilizer and Thiobacillus on Qualitative Traits and Nutrients Concentration of Potato

In order to study the effect of different amounts of sulfur fertilizer in the presence or absence of Thiobacillus thiooxidans bacteria (biosulfur) on qualitative traits and nutrients concentration in Potato cv. Agria, a factorial experiment was conducted based on randomized complete blocks design with three replication, in research farm of the faculty of agricultural sciences, university of Mohaghegh Ardabili at during growing season 2011-2012. The experimental factors contain sulfur fertilizer in four levels zero, 200, 300 and 400 kg ha-1 and biosulfur as biofertilizer in two levels control (without application) and using Thiobacillus. The results showed that the effect of sulfur fertilizer on the starch, dry matter and nitrate of tuber, also Thiobacillus, sulfur fertilizer interaction of those on the characteristics tuber yield per hectare, number of tuber per plant, content potassium and phosphorus of tuber and the soil pH were significant effect. highest amount of tuber yield per hectare, number of tuber plant and content phosphorus and potassium of tuber by application of 400 kg ha-1 Sulfur and terms of using Thiobacillus bacteria was obtained. The application of sulfur fertilizer and biosulfur was reduced soil pH, so that the highest rate of soil pH was observed in terms without application of sulfur and Thiobacillus bacteria. The highest amount starch and dry matter of tuber by using 400 kg ha-1 of Sulfur was resulted. Generally the application of 400 kg ha-1 sulfur with Thiobacillus bacteria recommended to increase the quantity and quality of potato in a calcareous soils.