Effect of temperature and seed size on some seed germination and seedling vigor properties of Salad burbent (Poterium sanguisorba)

This study was carried out to evaluate the effects of temperature and seed size onseed germination characteristics and initial seedling growthproperties of Salad burbent )Poterium sanguisorba(. For this purpose a factorial experiment in complete randomized block design with four replications was performed. Treatments included three levels of seed size, large 13.36 gr thousand carnal weight and diameter 6 mm, the average 6.43 gr a thousand carnal weight and diameter of 4.5 mm, and small 2.19 gr a thousand carnal weight and diameter of 3 mm. The two temperatures were 20 and 25ċ.The results showed that seed size and the different temperatures had significant effect on percentage of germination, seedling length and vigority.So that the temperature of 20ċ with smaller seed size, decreased speed and germination percentage, seedling length and vigority. In temperature of 25ċ with smaller seed size treatment, germination percentage, vigority and seedling length was reduced but the speed of germination did not show significant difference with large and medium size seeds. In large size, 25 ċ showed higher germination compared to 20 ċ, while in medium and small size seeds, germination of 20 ċ was more than 25 ċ. Vigority and germination rate increased whit increase in seed size.