Investigating the cold requirement of barberry shrub in Iran

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Rezaei Hassan; Fallah Ghalhari Gholamabbas

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Journal Paper

Paper Information

Journal: Journal of Geography and Planning Year:2024 | Volume:28 | Issue:87 Page(s): 264-249

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Information Journal Paper

Title

Investigating the cold requirement of barberry shrub in Iran

Author(s)

Rezaei Hassan | Fallah Ghalhari Gholamabbas | Issue Writer Certificate

Keywords

phenology"

cooling needs"

cooling hours"

Utah unit

barberry"

Iran

Abstract

Understanding the climatic potentials of the regions is very important for the diversity and talent of agricultural products. Barberry, one of the products of Iran, suffers from climate change and anomalies. In the present study, the phonological stages of barberry tree without any basis of field observations in Ghaen synoptic meteorological station were determined. To measure the accumulation of cooling needs based on the cold clock model and the Utah unit, the statistics of 18 valid meteorological stations from 1987 to 2017 on an hourly and daily time scale were used. The results showed that barberry needs six phonological stages to complete the growth period from early April to late November. The highest temperature requirement occurs in the ripening stage until fruit development. The cooling requirement of barberry tree in different stations varies from 1050 to 1960 hours depending on climatic conditions. Field observations showed that seedless barberry does not take on a full and commercial color if it does not meet the need for sufficient cooling. The study area was zoned according to the models of the cold clock and the Utah unit, based on which Ghaen and Zahedan stations have the highest cooling needs. Based on the validation indices of different models estimating the need for cooling, the root mean square criterion was used and the results show that the cold hour (CH) model has a higher performance due to the fact that the root mean square (RMSE) is less than the other model.

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