Articles
WINTREE: A COMPUTER PROGRAM FOR CALCULATING CHILL AND ANTHESIS UNITS USED IN MODELLING FRUIT TREE PHENOLOGY
Article number
499_28
Pages
245 – 252
Language
Abstract
WinTree is a collection of program modules designed to allow easy use of the ‘Utah’ and similar dormancy models.
WinTree includes the following modules: database, data update (entry), data collection (text files), dormancy modelling, and a workbook (spreadsheet). The program, created with Delphi 1.0 (Borland International, Inc.), runs on Microsoft Windows 95 or Windows NT. WinTree uses the Borland Database Engine (BDE) to allow access to commercial database files (Paradox). Temperature data can be entered as daily maximum and minimum or hourly intervals.
WinTree uses hourly or estimated hourly temperatures in calculations.
Estimated hourly temperatures are generated using various sine-exponential or linear methods.
Commonly, chill units (CU) are accumulated until the estimated end of endodormancy.
Then, growing degree hours (GDH °C) are accumulated until the estimated time of bloom.
WinTree can also be used to calculate only CU or GDH. The temperature requirements for determining chill units can be user modified.
GDH are calculated using either linear or asymmetric-curvilinear (ASYMCUR) methods.
The minimum, optimum, and critical temperatures used to calculate GHD are easily modified.
Data output can be hourly, daily or seasonal.
Output can be sent to the workbook module for additional calculations and transfer to spreadsheet programs.
WinTree includes the following modules: database, data update (entry), data collection (text files), dormancy modelling, and a workbook (spreadsheet). The program, created with Delphi 1.0 (Borland International, Inc.), runs on Microsoft Windows 95 or Windows NT. WinTree uses the Borland Database Engine (BDE) to allow access to commercial database files (Paradox). Temperature data can be entered as daily maximum and minimum or hourly intervals.
WinTree uses hourly or estimated hourly temperatures in calculations.
Estimated hourly temperatures are generated using various sine-exponential or linear methods.
Commonly, chill units (CU) are accumulated until the estimated end of endodormancy.
Then, growing degree hours (GDH °C) are accumulated until the estimated time of bloom.
WinTree can also be used to calculate only CU or GDH. The temperature requirements for determining chill units can be user modified.
GDH are calculated using either linear or asymmetric-curvilinear (ASYMCUR) methods.
The minimum, optimum, and critical temperatures used to calculate GHD are easily modified.
Data output can be hourly, daily or seasonal.
Output can be sent to the workbook module for additional calculations and transfer to spreadsheet programs.
Publication
Authors
R. Rojas-Martinez, S.D. Seeley, J.L. Anderson, J.W. Frisby, J.I. del Real-Laborde
Keywords
dormancy, apple, peach, rest, chill units, anthesis units
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