ESTIMATION OF CARDINAL TEMPERATURES AND THERMAL TIME REQUIREMENT FOR CYPERUS DIFFORMIS SEED GERMINATION

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DERAKHSHAN ABOLFAZL; GHEREKHLOO JAVID; PARAVAR EFAT

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Journal: IRANIAN JOURNAL OF WEED SCIENCE Year:2013 | Volume:9 | Issue:1 Page(s): 27-38

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Title

ESTIMATION OF CARDINAL TEMPERATURES AND THERMAL TIME REQUIREMENT FOR CYPERUS DIFFORMIS SEED GERMINATION

Author(s)

DERAKHSHAN ABOLFAZL | GHEREKHLOO JAVID | PARAVAR EFAT | Issue Writer Certificate

Keywords

BASE TEMPERATUREQ2

CEILING RESPONSEQ2

MODELINGQ2

OPTIMUM TEMPERATUREQ2

TEMPERATURE RESPONSEQ2

Abstract

The aim of this study was to quantify the response of germination rate to temperature and to find cardinal temperatures and thermal time required for different germination percentiles in Cyperus difformis. We compared 4 non-linear regression models [dent-like, segmented and beta (4 and 5 parameter)] to describe the germination ratetemperature relationships of C. difformis over seven constant temperatures (ranging from 15 to 45oC, with 5oC intervals). Different statistical indices [Root Mean of Squares of Error (RMSE), Akaike Information Criterion (AICc)] were used to compare models performances. The dent-like model was found to be the best model to predict germination rate (RMSE=0.0009, AICc=-380.8). The base, the lower optimum, the upper optimum and the maximum temperatures for the germination of C. difformis were estimated to be 14.73, 34.34, 38.54 and 45.01oC, respectively. The thermal time required to reach 50 and 95% germination was 43.50 and 65.01 degree-days, respectively. The cardinal temperatures depended on the model used for their estimation. Overall, the dent-like model was better suited than the other models to estimate the cardinal temperatures for the germination of C. difformis.

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APA: Copy

DERAKHSHAN, ABOLFAZL, GHEREKHLOO, JAVID, & PARAVAR, EFAT. (2013). ESTIMATION OF CARDINAL TEMPERATURES AND THERMAL TIME REQUIREMENT FOR CYPERUS DIFFORMIS SEED GERMINATION. IRANIAN JOURNAL OF WEED SCIENCE, 9(1), 27-38. SID. https://sid.ir/paper/185260/en

Vancouver: Copy

DERAKHSHAN ABOLFAZL, GHEREKHLOO JAVID, PARAVAR EFAT. ESTIMATION OF CARDINAL TEMPERATURES AND THERMAL TIME REQUIREMENT FOR CYPERUS DIFFORMIS SEED GERMINATION. IRANIAN JOURNAL OF WEED SCIENCE[Internet]. 2013;9(1):27-38. Available from: https://sid.ir/paper/185260/en

IEEE: Copy

ABOLFAZL DERAKHSHAN, JAVID GHEREKHLOO, and EFAT PARAVAR, “ESTIMATION OF CARDINAL TEMPERATURES AND THERMAL TIME REQUIREMENT FOR CYPERUS DIFFORMIS SEED GERMINATION,” IRANIAN JOURNAL OF WEED SCIENCE, vol. 9, no. 1, pp. 27–38, 2013, [Online]. Available: https://sid.ir/paper/185260/en

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