Evaluation of cleaning equipment effect on Pishtaz wheat (Triticum aestivum L.) cultivar seed in Alborz, Tehran and Ghazvin provinces germination and vigor improvement

Seed cleaning is the most important stages of seed processing and according to the type of devices used in the seed cleaning, has significant impact on improving the quality of seed lot and its certification. Therefor this study in order to evaluation of cleaning device effect on germination and vigor of Pishtaz wheat cultivar for comparison with t-test in completely randomized design by 4 replication conducted in Seed and Plant Certification and Registration Institute at Karaj. Treatments included seed before and after processing in 6 lines of seed processing from 5 seed producing company in 3 provinces (Ghazvin, Alborz and Tehran). Also studied characters were percentage of normal and abnormal seedlings, seedling dry weight and length, mobilized seed reserved to seedling ratio, electrical conductivity, content of seedling tissue water, weight percentage of other species seeds, density and weight of thousand seed. Results indicated seed processing were improved and enhanced the quality of seed germination and vigor. Also seed processing lines having gravity separator machines, averagely had more positive impact on improving seed germination and studied traits during processing and therefore application of gravity separator is essential in the processing of wheat seed. On the other hand results revealed processing line having full set of indented cylinder separators suitable for separation undamaged seeds from broken and mechanical damaged seeds for reduce the risk of processed seed lots contamination with mechanical injured and diseased seeds. The results show that manufactory of the processing equipment and adjusting devices according to the seed producing condition have a high importance in archiving to seed improvement and quality promotion.