caa a22 4500 445800747 CHVBK 20180317145140.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s00704-011-0404-1 doi (NATIONALLICENCE)springer-10.1007/s00704-011-0404-1 Variability of growing season indices in northeast of Iran [Elektronische Daten] [M. Bannayan, A. Lakzian, N. Gorbanzadeh, A. Roshani] Accurate use of precipitation can be considered as one of the best options to decrease the amount of underground water extraction for agriculture in arid and semi-arid areas such as northeast of Iran. For this reason, characteristics of the growing season such as onset, cessation, and length of the growing period should be analyzed. In this paper, we have calculated growing season characteristics of five locations in northeast of Iran using 45years historical daily weather data and employed four approaches with different calculation methods. As temperature is one of the limiting factors in irrigation-based agriculture, the first approach has been based on this factor. The three remaining approaches were based on joint rainfall and temperature approach, rainfall, evapotranspiration, and temperature approach, and the final approach was based on availability of adequate water in 0.25m of soil profile. The calculated onset dates using second and third approaches have been based on soil water balance model and relative evapotranspiration rate, and both were evaluated also to find whether the onset is a false start occurrence or not. The results showed that, when temperature was the only limiting factor, Bojnourd station with 197days showed the longest growing season, however, when precipitation was used along with temperature, longest growing season (124days) was obtained for Sabzevar station. The third approach which benefits from a water balance model and is similar to rainfed conditions showed the longest growing season with 147days for Mashhad station. When adequate soil water approach was used, Bojnourd station with 255days showed the longest growing season. Evaluation of false start of the growing season indicated the lowest probability of false start occurrence for Mashhad compared with other locations. Springer-Verlag, 2011 Bannayan M. Faculty of Agriculture, Ferdowsi University of Mashhad, P.O. Box91775-1163, Mashhad, Iran aut Lakzian A. Faculty of Agriculture, Ferdowsi University of Mashhad, P.O. Box91775-1163, Mashhad, Iran aut Gorbanzadeh N. Faculty of Agriculture, Ferdowsi University of Mashhad, P.O. Box91775-1163, Mashhad, Iran aut Roshani A. Faculty of Agriculture, Ferdowsi University of Mashhad, P.O. Box91775-1163, Mashhad, Iran aut Theoretical and Applied Climatology Springer Vienna 105/3-4(2011-10-01), 485-494 0177-798X 105:3-4<485 2011 105 704 https://doi.org/10.1007/s00704-011-0404-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00704-011-0404-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bannayan M. Faculty of Agriculture, Ferdowsi University of Mashhad, P.O. Box91775-1163, Mashhad, Iran aut NATIONALLICENCE 700 1- Lakzian A. Faculty of Agriculture, Ferdowsi University of Mashhad, P.O. Box91775-1163, Mashhad, Iran aut NATIONALLICENCE 700 1- Gorbanzadeh N. Faculty of Agriculture, Ferdowsi University of Mashhad, P.O. Box91775-1163, Mashhad, Iran aut NATIONALLICENCE 700 1- Roshani A. Faculty of Agriculture, Ferdowsi University of Mashhad, P.O. Box91775-1163, Mashhad, Iran aut NATIONALLICENCE 773 0- Theoretical and Applied Climatology Springer Vienna 105/3-4(2011-10-01), 485-494 0177-798X 105:3-4<485 2011 105 704 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer