The Modeling of Development Stages of Sunflower on the Basis of Temperature and Photoperiod

  • Sasan REZADUST PhD student of agronomy, Islamic Azad University of Karaj
  • Mohamad MEHDI KARIMI Faculty of Agriculture, Esfehan Industrial University
  • Saiid VAZAN Department of Agronomy and plant breeding of Islamic Azad University of Karaj, Iran
  • Mohammad Reza ARDAKANI Department of Agronomy and plant breeding of Islamic Azad University of Karaj, Iran
  • Ali KASHANI Department of Agronomy and plant breeding of Islamic Azad University of Karaj, Iran
  • Esmaeel GHOLINEZHAD Islamic Azad University, Science and Research Branch of Khozestan

Abstract

This experiment was conducted at the Station of Agricultural Research and Natural Resources, Khoy, Iran in 2007 and 2008 to evaluate the effect of temperature and photoperiod on the duration of development stages of sunflower. A randomized complete block design using a 8 x 3 factorial arrangement with four replications involving eight plantings (29th April, 4th May, 14th May, 24th May, 1st June, 10th June, 19th June and 28th June) and three sunflower cultivars (‘Sor’, ‘Eroflor’, ‘Azargol’). From the results obtained, all development stages, especially the generative phase were influenced by planting date. The duration of each development stage decreased with the delay in planting. The designed models indicated that the minimum temperature and photoperiod were directly proportional to development rate (DR) the whole life cycle of different sunflower cultivars. DR decreased from emergence (E) to physiological maturity (PM) as day length increased. The relationship between DR and photoperiod could be used as a practical model for estimating E to PM duration of these sunflower cultivars.

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Published
2010-06-15
How to Cite
REZADUST, S., KARIMI, M. M., VAZAN, S., ARDAKANI, M. R., KASHANI, A., & GHOLINEZHAD, E. (2010). The Modeling of Development Stages of Sunflower on the Basis of Temperature and Photoperiod. Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 38(1), 66-70. https://doi.org/10.15835/nbha3813564
Section
Research Articles