Productivity and Radiation Use Efficiency of Four Dryland Wheat Cultivars under Different Levels of Nitrogen and Chlormequat Chloride
محل انتشار: مجله علوم و فناوری کشاورزی، دوره: 13، شماره: 3
سال انتشار: 1390
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 30
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شناسه ملی سند علمی:
JR_JASTMO-13-3_004
تاریخ نمایه سازی: 1 آذر 1402
چکیده مقاله:
The impact of climate change in the next few decades will increase risks of wheat
production under dryland conditions. Therefore, it is important to find cultivars that are
tolerant to these conditions and can provide reasonable yield under future climates.
Radiation use efficiency (RUE) is the key factor determining the crop yield and is related
to crop biomass and leaf area index (LAI). To obtain a high yield from a given cultivar
under dryland conditions, it is necessary to achieve optimum RUE. In this study, the
effects of different levels of nitrogen fertilizer (N) and plant growth retardant
(chlormequat chloride= CCC) on LAI, dry matter accumulation, biomass yield, and RUE
of four dryland wheat cultivars were examined. The field experiment was carried out
during ۲۰۰۶-۰۷ and ۲۰۰۷-۰۸ growing seasons at the experimental agriculture research
station of Shiraz University, Iran. The results suggested that different cultivars varied
significantly in LAI, biomass and RUE under similar conditions and demonstrated the
dependency of RUE on LAI and biomass yield. During ۲۰۰۶-۰۷, the highest biomass
production (۴۳۱.۲ g m-۲) and RUE (۰.۹۹ g MJ-۱ m-۲) were obtained from Nicknejad
cultivar, CCC application, and using ۸۰kgN.ha-۱. During ۲۰۰۷-۰۸, the highest biomass
production (۳۳۳.۵ g m-۲) and RUE (۰.۷۶ g MJ-۱ m-۲) were obtained from Azar-۲ cultivar,
CCC application, and ۸۰ kg N ha-۱. Based on the results of this study, application of N and
selecting cultivars resistant to late season drought stress could be considered for
improving RUE in dryland farming.
کلیدواژه ها:
نویسندگان
H. Miranzadeh
Department of Crop Production and Plant Breeding, College of Agriculture, Shiraz University, P. O Box: ۷۱۴۴۱-۶۵۱۸۶, Shiraz, Islamic Republic of Iran.
Y. Emam
Productivity and Radiation Use Efficiency of Four Dryland Wheat Cultivars under Different Levels of Nitrogen and Chlormequat Chloride
H. Seyyed
School of Geography, University of Southampton, Southampton, SO۱۷ ۱BJ, UK.
S. Zare
Department of Water Engineering, College of Agriculture, Shiraz University, Shiraz, Islamic Republic of Iran.