STUDY THE TREND OF EARLY AND LATE FROST OCCURRENCES, LENGTH OF FROST-FREE PERIOD AND NUMBER OF FROST DAY TO REDUCE OF AGRICULTURAL DAMAGES IN SEVERAL CLIMATIC REGIONS OF IRAN

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VARSHAVIAN V.; GHAHREMAN N.; KHALILI N.; HAJJAM S.

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Journal: AGRICULTURAL RESEARCH Year:2008 | Volume:7 | Issue:4 (B) Page(s): 39-48

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Title

STUDY THE TREND OF EARLY AND LATE FROST OCCURRENCES, LENGTH OF FROST-FREE PERIOD AND NUMBER OF FROST DAY TO REDUCE OF AGRICULTURAL DAMAGES IN SEVERAL CLIMATIC REGIONS OF IRAN

Author(s)

VARSHAVIAN V. | GHAHREMAN N. | KHALILI N. | HAJJAM S. | Issue Writer Certificate

Keywords

LATE SPRING FROSTQ3

EARLY AUTUMN FROSTQ3

NUMBER OF FROST DAYQ3

FROST FREE PERIODQ3

AGROMETEOROLOGYQ3

Abstract

Occurrence of the early frost in autumn and the late frost in spring cause damage to crops in different climatic regions of Iran each year. Information about the probable dates of frost occurrence, helps farmers to avoid or reduce the damages caused by frost. In this study, high quality historical daily minimum temperature data in a 44 years period (1961-2004) from six synoptic stations, Tabriz, Tehran, Zahedan, Shiraz, Kermanshah, and Mashhad were used to derive agrometeorological indices i.e. date of last spring frost, SF (day), first autumn frost, AF (day), length of frost-free period, LFF (day), and NUMBER OF FROST DAY (1951-2005). These stations represent different climates of Iran based on Koppen climatic classification. First, time series (dates of frost, frost-free period and NUMBER OF FROST DAY) were checked for normality with the Kolmogorov-Smirnov test. Time trends for all variables were analyzed using parametric and nonparametric techniques. Zahedan (Steppe climate) didn' t show significant trend. Tehran (As the other example of steppe climate) showed significant positive trend in length of frost-free period and date of first autumn frost and a significant negative trend in date of last spring frost and NUMBER OF FROST DAY. Among representatives of temperate humid climate, Tabriz showed significant negative trend just in the NUMBER OF FROST DAY. Analyzing Mashhad and Kermanshah showed a similar significant positive trend in both length of frost-free period and date of first autumn frost and a significant negative trend in NUMBER OF FROST DAY. Also Shiraz, similar Tehran, showed significant trend in all studied time series. Generally, except Tabriz and Zahedan, length of period that plant can develop without the risk of frost has increased. Also, except Zahedan, NUMBER OF FROST DAY in other stations has decreased significantly.

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APA: Copy

VARSHAVIAN, V., GHAHREMAN, N., KHALILI, N., & HAJJAM, S.. (2008). STUDY THE TREND OF EARLY AND LATE FROST OCCURRENCES, LENGTH OF FROST-FREE PERIOD AND NUMBER OF FROST DAY TO REDUCE OF AGRICULTURAL DAMAGES IN SEVERAL CLIMATIC REGIONS OF IRAN. AGRICULTURAL RESEARCH, 7(4 (B)), 39-48. SID. https://sid.ir/paper/84779/en

Vancouver: Copy

VARSHAVIAN V., GHAHREMAN N., KHALILI N., HAJJAM S.. STUDY THE TREND OF EARLY AND LATE FROST OCCURRENCES, LENGTH OF FROST-FREE PERIOD AND NUMBER OF FROST DAY TO REDUCE OF AGRICULTURAL DAMAGES IN SEVERAL CLIMATIC REGIONS OF IRAN. AGRICULTURAL RESEARCH[Internet]. 2008;7(4 (B)):39-48. Available from: https://sid.ir/paper/84779/en

IEEE: Copy

V. VARSHAVIAN, N. GHAHREMAN, N. KHALILI, and S. HAJJAM, “STUDY THE TREND OF EARLY AND LATE FROST OCCURRENCES, LENGTH OF FROST-FREE PERIOD AND NUMBER OF FROST DAY TO REDUCE OF AGRICULTURAL DAMAGES IN SEVERAL CLIMATIC REGIONS OF IRAN,” AGRICULTURAL RESEARCH, vol. 7, no. 4 (B), pp. 39–48, 2008, [Online]. Available: https://sid.ir/paper/84779/en

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