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Articles by Afshin Soltani
Total Records ( 2 ) for Afshin Soltani
  Abolfazl Faraji , Nasser Latifi , Afshin Soltani and Amir Hossain Shirani Rad
  An experiment was conducted in Gonbad, Iran between 2005 and 2007 to study the variation in flower and pod number under high temperature stress and supplemental irrigation. The experiment was a randomized complete block design arranged in split plot. Two cultivars of spring type canola (Hyola401 and RGS003) as subplots and 5 sowing dates as main plots were used. The number of flowers on the main racemes that produced pods was 57 and 49% for Hyola401 and RGS003, respectively. Seed yield was positively related to pods per plant in the two cultivars with 38 and 64% of the variation for Hyola 401 and 71 and 84% of that for RGS003 under irrigation and rainfed conditions, respectively. The relationship between the number of flowers and pods in the main racemes was positively strong with 88 and 72% of the variation for Hyola401 and 88 and 78% of that for RGS003 under irrigated and rainfed conditions, respectively. High temperature; particularly in the late sowing dates accelerated the rate of plant development and reduced the length of the flowering period and also the number of flowers and pods. With a delay in sowing date; flowers and pods per main raceme decreased from 53 to 12 flowers and 34 to 2 pods over two years. Obtained results showed that a great proportion of the variations in flower and pod formation were related to environmental stress during the flowering. Quantitative relationships between flower and pod number with seed yield, crop phenology and temperature pattern during the critical period of flowering could be useful for crop modeling.
  Elias Soltani and Afshin Soltani
  The objective of this study was to evaluate the trends in historical temperature and precipitation measurements of Khorasan, Northeast of Iran. The selected sites included Bojnord (37°28` N, 57°19` E and 1091 m asl), Mashhad (36°16` N, 59°38` E and 999.2 m asl) and Birjand (32°52` N, 59°12` E and 1491 m asl). Linear regression analyses were used to determine the trends (slopes) in environmental variables, including monthly and yearly values of precipitation and maximum and minimum temperatures, over the years. While a clear detection of a warming trend as a consequence of greenhouse effect was difficult, the following results were obtained. Minimum temperature (0.29°C/decade) at Bojnord and both minimum (0.45°C/decade) and maximum (0.24°C/decade) temperatures at Mashhad indicated significant positive trend. The positive trend for minimum temperature at Bojnord and Mashhad could be ascribed to greenhouse effect. In Mashhad, vast urbanization and industrialization during the past decades was considered as another reason for positive trend in minimum as well as maximum temperature. At Birjand, however, the opposite was observed and negative trends were detected for both minimum (-0.23°C/decade) and maximum (-0.26°C/decade) temperatures probably as a result of aerosols production due to prolonged natural drought in the adjacent province, Sistan and Baluchestan, during the past decades. There was not a considerable trend in precipitation in monthly or yearly scales.
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