Journal of Agricultural Meteorology

Journal of Agricultural Meteorology

Determining the phenological stages rate of safflower at Kabootar Abaad of Isfahan

Document Type : Original Article

Authors
Talat Yasari 1
Mohammad Reza Shahsavari 2
1 Assistant Professor, Department of Science, Zabol University, Zabol, Iran
2 Horticulture Crops Research Department, Isfahan Agricultural and Natural Resources Research and Education Center, AREEO, Isfahan, Iran
10.22125/agmj.2024.410169.1156
Abstract
To improve agricultural practice, it is important to predict the length of development stages of crop species by environmental factors. When irrigation, nutrition, and other production factors are under control, the climatic conditions can determine the length of the development stages. Temperature and day length are the most important factors of plant development. To determine the rate equation of the development stage of a safflower cultivar named Zendeh Rood, the climatic elements of temperature, day length, and their combination were used. For variation in temperature and day length, this cultivar was planted on multiple dates and years. Stepwise regression was used to determine the best equation for the relationship between development rate and these variables. As the season progressed and the weather became warmer, the rate of different development stages increased, and as a result, the length of their development stages decreased. The standard deviation of the equation for the stages of planting to emergence, emergence to heading, flowering, and ripening were 1.2, 1.7, 3.6, and 4.5 days, respectively, which in turn shows the adequacy of the rate equation. Determination of coefficients for the stages of planting to emergence, emergence to heading, flowering, and ripening were 75.69, 85.88, 95.37 and 99.55 respectively. According to the different nature of development stages and the effect of temperature and day length on these stages, it was indicated that their contribution to determine the length of development stages was varied.
 
Keywords
Day Length
Development Stages
Safflower
Rate Equations
Temperature

Subjects

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