ISHS Acta Horticulturae 726: IV International Symposium on Pistachios and Almonds
A MODEL FOR ASSESSING THE CHILL UNITS RECEIVED IN KERMAN AND RAFSANJAN AREAS |
| Authors: | A. Javanshah, H. Alipour, F. Hadavi |
| Keywords: | chilling requirement, UTHA model, 0 to 7°C model, pistachio |
| Abstract:
In order to perform multivariate analysis and estimating the annual chilling requirement, aerology graphs were studied in a period of 7 years in two cities of Kerman province and chilling requirements were calculated in November, December, January, February and March from 1994 to 2000 by UTAH and 0 to 7°C models. The results of correlation analysis showed that the chilling requirement hours per year in 0 to 7°C model had a positive and significant correlation with the chilling requirement of December and March; the correlation coefficient (R) was 0.863 and 0.72 respectively. UTAH model had a positive and significant correlation with the chilling requirement of November and January with a correlation coefficient (R) of 0.739 and 0.763 respectively. The results of simple linear regression identified that the following equations exist among total annual chilling hours and chilling months of December and January: Y= 775.7+1.426 x1, R²= 0.81 Y= 583.6+1.54 x2, R²= 0.8 Y= total annual chilling hours x1= chilling hours in December calculated on 0 -7°C model in Kerman x2=chilling hours in December calculated on 0 -7°C model in Rafsanjan The results of multiple regression analysis showed that there were significant multiple regression equations between total annual chilling hours and monthly chilling hours in both models and areas. By using these equations for calculating chilling hours in some autumn and winter months of the year, the total annual accessible chilling hours can be forecasted. This is very useful to prevent lack of chilling by applying chemical treatments for the best flowering and fruit set. | |
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