Title: The study of improvement canola physiologic indices under subsurface drainage systems

Abstract

In order to study the effect of drainage systems on canola growth indices, a field experiment was conducted during 2016- 18 growing season at the Sari Agricultural Sciences and Natural Resources University. The treatments consisted of surface drainage (control) and three conventional subsurface drainage systems with 0.90 m and 0.65m drain depths at 15 and 30m spacing (D0.90L30, D0.65L30 and D0.65L15: D and L indicate drain depth and spacing, respectively). Leaf area index and total dry matter were measured randomly from each plot in different growth stages of canola. The traits were then used to determine some physiological indices. Data analysis was performed using SAS software under randomized complete block design. In treatments with subsurface drainage, the maximum LAI and TDW value was more than control. Accordingly, the status of other physiological indices is more appropriate. Generally, results showed that controlling water table has a major role in improving of canola growth physiological indices.