Journal of Plant Process and Function

In order to study the morpho-physiological traits of cotton cultivars ‎under 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 ‎, NAR, LAD, RGR, seed number per fruit‎, 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 ‎3 liters per hectare humic acid under adequate soil nitrogen improved the morphophysiological parameters of cotton plant‎  and increased yield