Study on the possibility of double - cropping cotton after winter crops In Golestan province

In order to evaluationthe best double cropping system in Golestan province,an experiment was carried out in 2010 in Karkandeh region (Kord kuy) in a split plot design based on RCBD with two factors and four replications. Main plotswere winter crop (wheat, pea, canola, bean and fallow)and subplots were twocottoncultivars(GolestanandSepid).Some agronomical, linter quality and cotton disease measured in this study. Analysis of variance indicated that,winter crop and cotton cultivarshadsignificanteffect on bolls number, bolls weight,earliness, total yield and linter quality. The effects winter crop significant differenceson thedisease dampingand verticillium. The most plant disease damping off percentin pea(%16.37) and decreasingin wheat (% 6.25) wereshowed.The most plant disease verticillium percentin fallow (%13.45) and decreasing in wheat (% 5.75) wereshowed.