Comprehensive evaluation and screening of different pollination combinations of chestnut based on different evaluation methods

In order to improve the yield of chestnut in Qianxi County of Hebei Province and select the optimum pollination combinations, eight excellent chestnut varieties were selected as paternal pollinators, two main varieties in Qianxi County as maternal parent. Direct sorting method and subordinate function method were employed to evaluate different pollination combinations based on the investigation of yield and fruit quality. The results indicated that only Yanshanzaofeng' Qianxi15'and Yanshanzaofeng' Dabanhong'ranked higher than that of control among pollination combinations with Yashanzaofeng'as female parent using direct sorting method. Five pollination combinations ranked higher than that of control among pollination combinations with Dabanhong'as female parent. The five pollination combinations were Dabanhong ' Qianxi14 ', Dabanhong ' Zunyu ', Dabanhong ' Qianxi15 ', Dabanhong'Yanlong'and Dabanhong'Yanshanzaofeng', respectively. Using subordinate function method, Yanshanzaofeng ' Qianxi15 ', Yanshanzaofeng ' Dabanhong 'and Yanshanzaofeng'Zunyu'all ranked higher than that of control among pollination combinations with Yashanzaofeng'as female parent. The ranking of pollination combinations with Dabanhong'as female parent was similar to that of using direct sorting method. Through comprehensive analysis, we can conclude that Qianxi15'and Dabanhong', are the best pollination varieties for Yanshanzaofeng'. Qianxi14', Zunyu'and Qianxi15'are the optimum pollination varieties for Dabanhong'.