Effects of Various Levels of Potassium Sulphate on Yield increase of Cultivars Sofeh and Goldasht of Safflower

Abstract
Safflower is one of the oil seeds plants than was cultured in arid and semi-arid areas. Due to increasing population and per capita consumption of oil, it is necessary to increase in the area under oilseeds cultivation and increase their yield to reduce the dependence on other countries. For this purpose, a factorial experiment was conducted in a randomized complete block design with three replications at educational and research farm branch of Karaj- Mahdasht in 2014 to 2015. The first factor consisted of two items of Sofeh & Goldasht, and the second factor includes four levels of fertilizers 0, 50, 75 and 100 kg/ha of Potassium sulphate. The results obtained from analysis of variance showed that the characters of, weight of single-bush trays, weight of thousand seeds, total number of single-bush seed, seed function, at probability level of 1% were become meaningful number for the factor. For the factor of Potassium fertilizer, the characteristics of weight of single-bush trays, total number of seeds in single-bush, weight of dry material in single bush, Grain yield, biological yield, Harvest Index was become meaningful at level of 1%. Interactions of number at various levels of potassium fertilizer for the total number of seeds in single-bush, performance of seeds and height of seed’s fullness are meaningful at probability level of 1%. Potash role in photosynthesis. On the other hand, according to the soil analysis that the amount of bromide is less than 200PPM, Its consumption improves photosynthesis and plant growth has been.