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Biophysical and chemical properties of oilseeds particularly sunflower seed plays important role in the proper design of equipment for handling, drying, separation, dehulling, conveying, storage and mechanical expression of seed oil. In this research, some biophysical and chemical properties of three hybrid sunflower varieties, Hysun33‚ Progress and Euroflore from four location, Aliabad, Golidagh, Kalale and Kalpush in Golestan province were studied for variations in linear dimensions, arithmetic mean diameter, geometric mean diameter, sphericity, surface area, true and bulk densities, porosity, 1000 seed weight, volume, moisture content, hull and kernel percent, major, intermediate and minor size distribution, oil percent in seed, kernel and hull which determined by using of standard methods. The results showed that the length and geometric mean diameter of sunflower seeds varied from 8.800 to 10.987 mm, 4.651 to 5.979 mm, respectively. Within these data minimum and maximum values related to Golidagh Euroflore variety and Kalale Progress variety, respectively. The results of ANOVA shows that all of gravimetric properties of seeds such as 1000 seed weight, bulk and true densities, porosity are significant at the 0.01probability level. Percentage of large seeds and hull varied 3.580 (Aliabad Hysun33) to 28.487 (Kalaleh Progress) and 25.792 (Aliabad Hysun33) to 28.825 (Kalaleh Hysun33), respectively. At the end, with attention to interaction effect of variety and locations on characteristics of sunflower seed, the samples should be detached before handling and delivering to oil extraction industry.  

Keywords: Grading, Sunflower seed, Chemical properties, Biophysical properties

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