BOROOMAND NASAB Saeid, KASHKULI Heidar Ali and KHALEDIAN Mohamad Reza
Associate Prof., Prof., and graduated student respectively Irrigation Department, Shahid Chamran University, Ahwaz, Iran
Crop coefficient of sugarcane is necessary for the water requirement estimation in irrigation water planning and management. This study has been initiated to determine the crop coefficient (Kc) of sugarcane (Ratoon) in Haft tappeh climate. The relationships between Kc, ETc/Ep, length growth, days after cutting (DAS) and percent days after cutting (%DAS), were also investigated.
The mid-season and late-season Kc values for sugarcane were 1.45 and 1.14, respectively. These values are somewhat higher than those values that recommended by FAO. The ratio of ETc/Ep varied between 0.64 to 1.10 from the beginning to the end of the growing season .
The maximum ratios of ETc/ET0 and ETc/Ep occurred at a length growth of 126 cm. Furthermore, second order polynomials were presented to predict the Kc values from days after cutting (DAS) and percent days after cutting (%DAS).