EFFECTS OF GROWING DEGREE-DAY ON PHENOLOGY OF O.MELANOTRICHA

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AZARNIVAND H.; TARKESH ESFAHANI M.; BASIRI M.; ZARE CHAHOUKI M.A.; SAEIDFAR M.

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Journal: Journal of Range and Watershed Managment Year:2012 | Volume:65 | Issue:1 Page(s): 1-10

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Title

EFFECTS OF GROWING DEGREE-DAY ON PHENOLOGY OF O.MELANOTRICHA

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Keywords

ONOBRYCHIS MELANOTRICHAQ2

GROWING DEGREE -DAYQ2

PHENOLOGICAL STAGESQ2

Abstract

In agriculture, accumulated growing degree - day is commonly used to predict crop development, classify species and hybrids as to maturity data and evaluate climate for crop suitability, but relationships between accumulated degree day and phonological development of range species have received less attention. This research tested the hypothesis that phenological development is related to accumulated degree- day and that these relationships are stable over environment. Therefore this study was conducted in two different field studies on O. melanotricha. One of the most important steps in the design of degree-day system is establishment of the base temperature. For this purpose, seed plants are grown in a controlled environment, at constant temperature (10, 15, 20, and 25’oC) and constant photoperiod, with development rate expressed as a function of temperature. The best fitting line of development rate versus temperature is extrapolated to zero growth. The point at which this line crosses the temperature axis defines the best temperature. Thresholds (base temperature) are different for each species. The linear regression analysis showed highly significant (p=0.01) between rate development and temperature for this species. Degree - day can be easily calculated by using the average daily temperature minus the base temperature. Degree day are totaled over a period of days to determine when a plant has reached a certain phonological stage. Based on the species and condition of this study, plant PHENOLOGICAL STAGES can be predicted from accumulated growing degree-day. Determining relationship between plant phonological development and growing degree-day is especially useful for grazing management.

Cites

INVESTIGATION OF HABITAT CHARACTERISTICS AND PHENOLOGY OF FIVE RANGE SPECIES IN HIGHLANDS OF KASHAN, IRAN

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APA: Copy

AZARNIVAND, H., TARKESH ESFAHANI, M., BASIRI, M., ZARE CHAHOUKI, M.A., & SAEIDFAR, M.. (2012). EFFECTS OF GROWING DEGREE-DAY ON PHENOLOGY OF O.MELANOTRICHA. JOURNAL OF RANGE AND WATERSHED MANAGEMENT (IRANIAN JOURNAL OF NATURAL RESOURCES), 65(1), 1-10. SID. https://sid.ir/paper/162500/en

Vancouver: Copy

AZARNIVAND H., TARKESH ESFAHANI M., BASIRI M., ZARE CHAHOUKI M.A., SAEIDFAR M.. EFFECTS OF GROWING DEGREE-DAY ON PHENOLOGY OF O.MELANOTRICHA. JOURNAL OF RANGE AND WATERSHED MANAGEMENT (IRANIAN JOURNAL OF NATURAL RESOURCES)[Internet]. 2012;65(1):1-10. Available from: https://sid.ir/paper/162500/en

IEEE: Copy

H. AZARNIVAND, M. TARKESH ESFAHANI, M. BASIRI, M.A. ZARE CHAHOUKI, and M. SAEIDFAR, “EFFECTS OF GROWING DEGREE-DAY ON PHENOLOGY OF O.MELANOTRICHA,” JOURNAL OF RANGE AND WATERSHED MANAGEMENT (IRANIAN JOURNAL OF NATURAL RESOURCES), vol. 65, no. 1, pp. 1–10, 2012, [Online]. Available: https://sid.ir/paper/162500/en

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