COMPARISON OF WINTER WHEAT GDD VALUES CALCULATED USING DAILY AND HOURLY TEMPERATURE DATA IN TWO CLIMATIC REGIONS OF IRAN

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HELALI J.; GHAHREMAN N.; KHALILI A.

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Journal: Applied Agricultural Research Year:2016 | Volume:29 | Issue:110 Page(s): 8-18

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Title

COMPARISON OF WINTER WHEAT GDD VALUES CALCULATED USING DAILY AND HOURLY TEMPERATURE DATA IN TWO CLIMATIC REGIONS OF IRAN

Author(s)

HELALI J. | GHAHREMAN N. | KHALILI A. | Issue Writer Certificate

Keywords

GROWING DEGREE DAYSQ3

GROWING DEGREE HOURSQ1

WHEATQ3

PARS ABADQ2

DARABQ1

Abstract

Temperature is one the most important meteorological variables affecting plant growth and development.that influence on alive.In this study the heat requirement of winter whaet in to climatic region of Iran namely PARS ABAD and DARAB were estimated using 3 hourly tempeareure data and hourly data generating models.The results revealed that climate type, merthod of GDD calculation and temperature thresholds are have significant effect in GDD calculation.In the regions with maximum temperature above the fixed thereshold, maxmum-minimum method was superior to mean temperature method.The results showed that models using daily data are almost coincide, but a significant difference were observed between hourly and daily models.In warm climate, the calibrated values of maximum temperature was slightly above the given threshold but in cold the climate the difference between calibrated and fixed thereshold was lower.In general, the results of study showed that in early, phenological stages, mean temperature mehod is preferable for GDD calculation, in the other two stages (mid and late) due to.

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APA: Copy

HELALI, J., GHAHREMAN, N., & KHALILI, A.. (2016). COMPARISON OF WINTER WHEAT GDD VALUES CALCULATED USING DAILY AND HOURLY TEMPERATURE DATA IN TWO CLIMATIC REGIONS OF IRAN. APPLIED FIELD CROPS RESEARCH (PAJOUHESH & SAZANDEGI), 29(110), 8-18. SID. https://sid.ir/paper/214898/en

Vancouver: Copy

HELALI J., GHAHREMAN N., KHALILI A.. COMPARISON OF WINTER WHEAT GDD VALUES CALCULATED USING DAILY AND HOURLY TEMPERATURE DATA IN TWO CLIMATIC REGIONS OF IRAN. APPLIED FIELD CROPS RESEARCH (PAJOUHESH & SAZANDEGI)[Internet]. 2016;29(110):8-18. Available from: https://sid.ir/paper/214898/en

IEEE: Copy

J. HELALI, N. GHAHREMAN, and A. KHALILI, “COMPARISON OF WINTER WHEAT GDD VALUES CALCULATED USING DAILY AND HOURLY TEMPERATURE DATA IN TWO CLIMATIC REGIONS OF IRAN,” APPLIED FIELD CROPS RESEARCH (PAJOUHESH & SAZANDEGI), vol. 29, no. 110, pp. 8–18, 2016, [Online]. Available: https://sid.ir/paper/214898/en

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