Chilling and heat requirements of pear varieties in Shanghai area
Different models were used to estimate the chilling and heat requirements,taking 4 pear varieties in Shanghai as materials.The results showed that the chilling requirements of pear varieties were 191-518 h under the ≤7.2 ℃ model,171-394 h for the 0-7.2 ℃ model,138-192 C·U for the Utah model(except'Cuiguan').Chilling requirement of'Cuiguan'was the lowest,followed by'Hujingli 18'and'Hujingli 67',which the highest was'Zaosheng xinshui'.Heat requirements of the 4 pear cultivars were from 10 456 to 10 781 GDH·℃ under the growing degree-hour model,heat requirement of'Zaosheng xinshui'was the lowest,the second was'Cuiguan',and the highest was'Hujingli 18'and'Hujingli 67'.Heat requirement of the 4 pear varieties ranged from 187 to 240 D·℃ under the effective temperature model,'Cuiguan'had the lowest heat requirement,and there was little difference among the other varieties.The estimation of chilling requirements for pear varieties suitable for Shanghai was recommended to use the 0-7.2 ℃ model as a priority.The Utah model was recommended for pear varieties with the high chilling requirement.The growing degree-hour model was better suited for the estimation of heat requirements of pear varieties than the effective temperature model.
国家科技期刊平台
NSTL
万方数据
