Chilling Injury Risk of Early Rice in Centralized Seedling Mode in Jingzhou

doi:10.3969/j.issn.1000-6362.2017.04.005

Abstract

Abstract: According to investigations of early rice seedling modes in Jingzhou, chilling injury was usually occurred, and initiated by yield reduction. Based on the average daily temperature observations of 6 national meteorological stations, and development period observations between 1981 and 2014, the average effective accumulated temperature of each stage was counted under the traditional seedling mode(TS). Furthermore, two kinds of centralized greenhouse seedling modes, which were 10 days(CS-10) or 20 days(CS-20) earlier than TS, were set to analyze the change rules of chilling accumulative temperature(accumulated value of the difference between critical temperature of chilling injury and average daily temperature in each stage) and the chilling injury characteristics of weibull probability density distribution. The results indicated that, compared with TS mode, advanced with seedling date, the beginning date of transplanting-tillering stage, panicle differentiation, flowering, grain filling and maturation stage were respectively 14d, 10d, 8d, 11d and 7d earlier in CS-10 mode, and 24d, 15d, 11d, 17d, 10d earlier in CS-20 mode. In addition, in the early stage(transplanting-tillering stage and panicle differentiation stage), the probability of mild chilling injury(0＜H≤10℃·d, chilling accumulated temperature) reduced, and increased in the later stage(flowering stage and grain filling stage). Nevertheless, moderate and above chilling injury(H＞10℃·d) was increased rapidly in the transplanting-tillering stage and panicle differentiation stage, which were separately reached 14.7%, 49.7% in the CS-10 mode, and 57.1%, 71.7% in the CS-20 mode. For reducing the risk of chilling injury, the suitable sowing date of centralized seedling mode in Jingzhou should be later than March 25th, which was 7 days earlier than TS mode.

Key words: Centralized seedling raising, Greenhouse, Double-season early rice, Chilling injury, Weibull distribution, Chilling accumulative temperature

LIU Kai-wen, WANG Hai-rong, ZHU Jian-qiang, SU Rong-rui, GAO Hua-dong. Chilling Injury Risk of Early Rice in Centralized Seedling Mode in Jingzhou[J]. Chinese Journal of Agrometeorology, 2017, 38(04): 240-247.

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