Effects of humic acid application on yield and quality of cotton (Gossypium hirsutum L.)

Humic acid are referred to as humic substances and are used as soil conditioners, soil supplements and fertilizer amendments. This research was conducted to determine the effects of different humic acid treatments (seed soaking, foliar spray, seed soaking + foliar spray) on yield and technological characteristics of cotton in 2004-2005 at Diyarbakir, Turkey. Plant height, first hand cotton seed yield, number of bolls and sympodial branches and total cotton seed yield affected by humic acid applications. Humic acid applications had no significant effect on ginning percentage and quality properties such as fiber length, fiber fineness and fiber strength.