Evaluation of morpho-physiological traits of cotton cultivars (Gossypium hirsutum) under the influence of humic acid in saline soil

In order to study the morpho-physiological traits of cotton cultivars ýunder the Influence of humic acid in saline conditions, a factorial field experiment was conducted in a randomized complete block design with three replications in Kashan in the growing seasons of 2014. The first factors included three cotton cultivars: Varamin, line 43200 and khordad, and the second factor consisted six foliar treatment included without humic acid and inadequate soil nitrogen (T1), without humic acid under adequate soil nitrogen (T2), 3 liter per hectare humic acid under adequate soil nitrogen (T3), 1 liter humic acid per hectare under adequate soil nitrogen (T4), 3 liter humic acid per hectare under adequate soil nitrogen (T5), and 6 liter humic acid per hectare under adequate soil nitrogen (T6). The results showed that foliar application of humic acid significantly affected number of leaf ý, NAR, LAD, RGR, seed number per fruitý, seed index, lint index and cotton yield. So that, the highest LAD, seed index, lint index and cotton yield were achived in application of 3 liters per hectare humic acid under adequate soil nitrogen in all cultivars and the highest leaf number, NAR, and RGR were obtained under 6 liters per hectare. finally the application of ý3 liters per hectare humic acid under adequate soil nitrogen improved the morphophysiological parameters of cotton plantý and increased yield.