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Showing 2 results for Miranzadeh

H. Miranzadeh, Y. Emam, H. Seyyed, S. Zare,
Volume 13, Issue 3 (Number 3 - 2011)
Abstract

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 2006-07 and 2007-08 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 2006-07, the highest biomass production (431.2 g m-2) and RUE (0.99 g MJ-1 m-2) were obtained from Nicknejad cultivar, CCC application, and using 80kgN.ha-1. During 2007-08, the highest biomass production (333.5 g m-2) and RUE (0.76 g MJ-1 m-2) were obtained from Azar-2 cultivar, CCC application, and 80 kg N ha-1. 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.
H. Miranzadeh, Y. Emam, P. Pilesjö, H. Seyyedi,
Volume 13, Issue 6 (Number 6 - 2011)
Abstract

It is suggested that cultivars of wheat (Triticum aestivum L.) with regulated growth and development would be able to produce higher yields under water-limited conditions, which is crucial in future food production. Water use efficiency (WUE) is worthy of exploration in this regard. In this study, the effects of nitrogen fertilizer levels (0, 40 and 80 kg Nha-1) and a plant growth retardant (Chlormequat Chloride = CCC) on WUE of four dryland wheat cultivars (Agosta, Nicknejad, Azar-2 and Fin-15) were examined in a field experiment during 2006-07 and 2007-08 growing seasons at College of Agriculture, Shiraz University, Iran. The results showed that there existed significant differences between cultivars for grain yield, biomass and WUE. In the first season, the highest grain yield and biomass production (192.4 and 431.2 gm-2, respectively) were obtained from Nicknejad cultivar, CCC application and using 80 kg Nha-1, and in the second season, from Azar-2 cultivar (121.5 and 333.5 gm-2, respectively). CCC and nitrogen had significant effects on photosynthesis rate and WUE in both seasons. Interaction of CCC and 80 kg Nha-1 on WUE were significant in both seasons (1.24 and 2.72 gm-2mm-1, respectively). It is suggested that interactive application of CCC and nitrogen fertilizer could have beneficial effects on wheat grain yield under similar agro-climatic conditions.

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