Determination of Frozen Injury Grade Index for Young Fruit of Loquat

doi:10.3969/j.issn.1000-6362.2016.01.012

Abstract

Abstract:

Based on the data of low temperature box experiment and climatic gradient observation at hillside land in last 5 years, and historical disaster data of the main production provinces, the frozen injury grade index for young fruit of loquat was studied by using methods of induction analysis and contrast verification. The results showed that the frozen injury grade index for young fruit of loquat could be represented by the daily extreme minimum temperature (Tmin) and the continuous days of low temperature (DD). All of the frozen injury grade index was as follows: the mild frozen injury -2.5℃＜Tmin≤-1.0℃ and DD≤3d, the moderate frozen injury -3.5℃＜Tmin≤-2.5℃ and DD≤3d or -2.5℃＜Tmin≤-1.0℃ and DD＞3d, the severe frozen injury -4.5℃＜Tmin≤-3.5℃ and DD≤3d or -3.5℃＜Tmin≤-2.5℃ and DD＞3d, the serious frozen injury was Tmin≤-4.5℃ and DD≤3d or Tmin≤-3.5℃ and DD＞3d. Compared to historic disaster data, the accuracy of the frozen injury grade index was 61% in Putian region Fujian province, and 87.5% in Huangyan and Linhai region Zhejiang province, which indicated that the frozen injury grade index for young fruit of loquat could be used for frozen disaster prediction.

Key words: Young fruit of loquat, Frozen injury, Grade index

CHEN Hui, YANG Kai, LIN Jing, WANG Jia-yi, CHEN Tao, MA Zhi-guo, LI Li-chun, PENG Ji-da. Determination of Frozen Injury Grade Index for Young Fruit of Loquat[J]. Chinese Journal of Agrometeorology, 2016, 37(01): 91-97.

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