Document Type : Research Article
Authors
1 Professor Agro meteorology, Department of Water Engineering, Faculty of Agriculture, Ferdowsi University of Mashhad
2 Ferdowsi University of Mashhad
3 Faculty of Agriculture, Ferdowsi University of Mashhad
Abstract
Abstract
Weather and climate are the most important parameters which affect on growth and development of plants and are the non-control and effective factors in agriculture. Threshold tolerance of plants is limited to these climatic parameters and fluctuation of these parameters has significant effect on agricultural products directly and indirectly. During the year, different climatic hazards damaged Khorasan Razavi province especially on agriculture field. Heat stress is one of the hazards that effects on plants. In this paper, heat stress is studied and mapped in Khorasan Razavi province. For this reason and according to plant thermal requirements, 30, 35 and 40 ºC thresholds determined for maximum and 20 ºC for minimum temperatures. Then by using meteorological data in a 13 years period, number of days with temperature more than these thresholds determined. After statistical test in Jmp software for determining sample size of data, suitable equations extracted for mapping by using Digital Elevation Model. Results show that heat stress appears more in south and west of Khorasan Razavi province and in this region Sabzevar and Sarakhs are damaged more than other places.
Key words: Heat stress, Khorasan Razavi, Mapping
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