Chilling and heat requirements and relationship between them for major grape cultivars under protected culture
Chilling and heat requirements were studied in 22 grape cultivars under protected culture.Three different models ( ≤ 7.2 ℃ Model, 0～7.2 ℃ Model and Utah Model) for estimating chilling requirements and two different models (Growing Degree Hours Model and Effective Temperature Model) for estimating heat requirements were evaluated , and correlations between chilling requirements and heat requirements were established. Different chilling requirement and slight differences in heat requirements were observed in the studied cultivars. The cultivars examined showed a range of chilling requirements,between 573 h and 1 246 h( ≤7.2 ℃ Model)or between 573 h and 971 h(0～7.2 ℃ Model)or between 917 C·U and 1 090 C .U (Utah Model). The heat requirements ranged between 9 976 and 12 541 growing degree hours (GDH), or between 253 ℃ and 353 ℃ (Effective Temperature Model). The results indicate no correlation between chilling or heat requirement and ripening date , as well as a negative correlation between chilling requirements and heat requirements.
国家科技期刊平台
NSTL
万方数据
维普
