Document Type : Research Paper
Associate Professor, Department of Water Engineering, College of Agriculture and Natural Resources, Razi University, Kermanshah, Iran
MSc. Student, Department of Water Engineering, College of Agriculture and Natural Resources, Razi University, Kermanshah, Iran
Assistant Professor, Department of Agronomy, College of Agriculture and Natural Resources, Razi University, Kermanshah, Iran
For a suitable irrigation programming and an efficient management, crop coefficient determination for different plant growth stages are necessary. In this investigation water requirement, single and dual crop coefficient of Rosmarinus officinalis L. was determine by drainable lysimeter in a semi-arid climate condition. By using of drainable lysimeter, the exact water requirement and also KC values can be obtained. For this objective five drainage lysimeters were used. In those three available lysimeter, (Rosmarinus officinalis L.), in one grass and in the last one no any plant were cultivated. During investigation the enough irrigation water were used and soil lysimeter were kept in the field capacity condition. The water balance equation was used to determine the evapotranspiration in all lysimeters. Finally, the total water requirement, single and dual (Rosmarinus officinalis L.) were determined as 495.63 mm, (0.30, 0.63, 0.96) and (0.32, 1.20, 1.05) respectively.