برآورد دﻣﺎﻫﺎی ﭘﺎﻳﻪ، ﺑﻬﻴﻨﻪ و ﺑﻴﺸﻴﻨﻪ ﺑﺬر رازﻳﺎﻧﻪ ( Foeniculum vulgare mill )

Fennel ( Foeniculum vulgare mill) known in the world as a valuable medicinal plant. In this study, This study was aimed to quantify germination response of Fennel temperature. For this purpose, seeds were
exposed to different constant temperatures (10, 15 , 20, 25, 30 and 35 ) in Seed Research Lab., Gorgan University of Agriculture Science and Natural Resources in 2013. 50 seeds of Fennel disinifection and were arranged two paper towel. Computation germinated seeds after 24 hours of testing was done on a daily basis for 14 consecutive days. Assessment of three nonlinear regression models including segmented, dent-like and beta models base on 50% germination revealed that dent-like model was superior to other models. To select the best model from ,Root Mean Square Error, correlation coefficient and linear regression coefficients were used as statistical indices. Base on the superior model (dent-like), base, optimum lower an upper
temperature and ceiling temperatures were estimated as 7, 15, 18 and 31.53 , respectively.