Legume Research

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Research Article

Legume Research, volume 40 issue 2 (april 2017) : 291-298

Cardinal temperatures and thermal time required for emergence of lenti (Lens culinaris Medik)

Ali reza Safahani*, Behnam Kamakar, Amir Nabizadeh
1<p>Department of Agronomy,&nbsp;Payame Noor University, Tehran, I. R. of Iran.</p>
Cite article:- Safahani* reza Ali, Kamakar Behnam, Nabizadeh Amir (2017). Cardinal temperatures and thermal time required foremergence of lenti (Lens culinaris Medik) . Legume Research. 40(2): 291-298. doi: 10.18805/lr.v0i0.7301.

ABSTRACT

The present study was performed to compare four nonlinear regression models (segmented, beta, beta modified, and dent-like) to describe the emergence rate–temperature relationships of six lentil (Lens culinaris Medik) cultivars at field experiment with a range of sowing dates, with the aim of identifying the cardinal temperatures and physiological days (i.e., number of days under optimum temperatures) required for seedling emergence. Models and statistical indices were calibrated using an iterative optimization method and their performance was compared by root mean square error (RMSD), coefficient of determination (R2) and corrected Akaike information criterion correction (AIC). The beta model was found to be the best model for predicting the response of lentil emergence to temperature, (R2= 0.99; RMSD= 0.005; AICc= -232.97). Based on the model outputs, the base, optimum, and maximum temperatures of seedling emergence were 4.5, 22.9, and 40 °C, respectively. The Six physiological days (equivalent to a thermal time of 94 °C days) were required from sowing to emergence. 

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