Effect of ginning and delinting on Sahel cotton(Gossypium hirsutumL.) cultivar seed germination and seedling vigor

In order to study the effect of ginning and delinting on Golestan province produced Sahel cotton (Gossypium hirsutum L.) cultivar planting seed germination and seedling vigor, this research was carried out as factorial experiment based on completely randomized design by four replications. Treatments were including ginning of produced cottonseed in two regions, Anbar Oloom and Gonbad (respectively west and east regions of Golestan province) by8 an 16 saw gin machines at two ginning plants at two regions, ginning by manual roller gin machine and hand ginning and delinting by acid sulfuric.Results revealed that seed production region, cotton seed ginning methods and delinting interaction on studied traits was significant. Ginned by manual roller gin and 16 saw gin and not delinted seeds of province east, had respectively highest and lowest normal seedlings percent. Also hand ginned and not delinted seeds of province east had the lowest abnormal seedlings percent. Also lowest and highest mean germination time and coefficient of velocity of germination respectively related to west of province seeds which their cottonseed ginned by manual roller gin and not delinted. Not delinted and cottonseed ginned by manual roller gin seeds west of province and east of province not delinted and cottonseed ginned by16 saw gin machine of Gonbad ginning plant seeds respectively had most and lowest seedling weight vigor index. Also highest and lowest seedling length vigor index belonged to delinted and ginned by manual roller gin seeds of Golestan province east and not delinted and ginned by by16 saw gin machine of Gonbad ginning plant seeds of this region respectively. Totally, based on this research results revealed that, seeds produced at east of Golestan province had low susceptibility to acid delinting and recommended for Sahel cottonseed ginning, especially produced at west of Golestan province cottonseeds, roller ginning machine used till seed coat damage and delinting by acid effect on germination ability and seed and seedling vigor decreased.