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CUMAP : A Chill Unit Calculator for Spatial Estimation of Dormancy Release Date in Complex Terrain  

Kim Kwang S. (아이오와주립대학교(미국) 식물병리학과)
Chung U ran (경희대학교 생태시스템공학과)
Yun Jin I. (경희대학교 생태시스템공학과)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.6, no.3, 2004 , pp. 177-182 More about this Journal
Abstract
A chill unit has been used to estimate chilling requirement for dormancy release and risk of freezing damage. A system that calculates chill units was developed to obtain site-specific estimates of dormancy release date for grapes and evaluated in Baekgu myun near Kimje City, Chunbuk, Korea from September 2002 to March 2003. The system utilized daily minimum and maximum temperature maps generated from spatial interpolation with temperature correction for topography. Hourly temperature was temporally interpolated from the daily data using a sine-exponential equation (Patron and Logan, 1981). Hourly chill units were determined from sigmoid, reverse sigmoid, and negatively increasing sigmoid functions based on temperature ranges and summed for 24 h. Cumulative daily chill units obtained from measurements did not increase until 20 October 2002, which was used as a start date for accumulation to estimate the dormancy release date. As a result, a map of dormancy release date in the study area was generated, assuming 800 chill units as a threshold for the chilling requirement. The chill unit accumulation system, implemented using Microsoft Visual Basic and C++ (Microsoft, Redmond, WA, USA), runs in the Windows environment with ArcView (ESRl Inc., Redlands, CA, USA).
Keywords
Chill Unit; Dormancy; Fruits; Trees; Spatial Analysis;
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  • Reference
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