نتایج جستجو برای: growth degree days
تعداد نتایج: 1401734 فیلتر نتایج به سال:
In this research, temporal trends and change points in heating degree-days (HDD), cooling (CDD), their simultaneous combination (HDD + CDD) were analysed for a 60-year period (1960–2019) Iran. The results show that less than 20% of the study stations had significant (either upward or downward) HDD time series, while more 80% increasing CDD series. Abrupt changes series mostly occurred early 198...
The purpose of this study is predicting climate changes and investigating the effect of probable climate change on the growing degree-days in the northwest of Iran. For this purpose the climatic data of seven synoptic stations during a 25 years period (1985-2009) was collected including Oroomieh, Tabriz, Zanjan, Sanandaj, Ghazvin, Kermanshah, and Hamedan were used as the base period and thus te...
The aim of this study was to investigate the chill and heat requirements of flower buds of 8 foreign and domestic commercial cultivars and promising domestic almond genotypes during 2019 and 2020 as a factorial experiment based on a completely randomized design with 3 replications and two factors including five cultivar type (Tuono, Nanpariel, Mamaie, Shahroud 12, Rabi) and three genotypes (1-1...
The geographical distribution of growing degree-days (GDDs) within Iran was studied using GIS-based maps. GDDs were calculated using daily thermal parameters (daily maximum and minimum air temperature). Based on the purpose of the study and climatic conditions of Iran, the average value of 5?C was chosen for GDD calculation. The calculations were carried out using daily weather data of 113 mete...
Studying plant phenology is very important to regulate the rangeland utilization. Plant phenology can be determined by Growing Degree Days (GDDs). Since temperature varies yearly, the phenological stages may consequently differ yearly. Determining the base temperature is one of the key steps in the calculation of GDDs. The aim of this study was to calculate the required GDDs for each phenologic...
The effect of photoperiod and growing degree days (GDD) on dry matter and dry matter partitioning in Jerusalem artichoke was investigated during 2008-09 and 2009-10. Three Jerusalem artichoke genotypes (CN-52867, JA-89 and HEL-65) were planted in 15 day-intervals between with thirteen different dates (September 20 to March 20) atKhon Kaen University,Thailand. Jerusalem artichoke genotypes ...
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