Effects of High Temperature Hours and Thermal Accumulated Temperature on Seed Setting Rate of Super Hybrid Rice

doi:10.3969/j.issn.1000-6362.2016.04.010

Abstract

Abstract:

An experimental rice field for different stage sowing was conducted in 2012 and 2013 respectively, taking super hybrid rice Jinxin203 as material. Based on yields data and observed meteorological data, the effect of high temperature hours and day thermal accumulated temperature after heading stage on rice setting percentage and empty grain percentage was discussed. The results showed that the main reason to low setting percentage of rice was undergoing high temperature from milky stage to mature stage, but high temperature and empty grain percentage had not obvious correlation. There was negative correlation between setting percentage and high temperature hours, daily thermal accumulate temperature, and hours thermal accumulate temperature, but there was positive correlation between empty grain percentage and high temperature hours, daily thermal accumulate temperature, and hours thermal accumulate temperature. The three factors existed threshold values to rice setting percentage. The threshold values of high temperature hours from milky stage to mature stage were 44.4h, 32.6h, 22.6h, 15.0h and 6.0h, respectively. The threshold values of daily thermal accumulate temperature from heading to mature stage was 18.6℃·d, and 12.8℃·d from milky stage to mature stage. The threshold values of hours thermal accumulate temperature from heading to mature stage was 44.9℃·d, and 53.2℃·d from milky stage to mature stage. When temperature was lower than household value, the rice setting percentage decreased with high temperature accumulated. When high temperature reached the household value, the setting percentage had not changed further. The result indicated that high temperature from milky stage to mature stage was the key factor to lead the setting percentage decreasing.

Key words: Early super rice, Different sowing dates, High temperature factors, Day thermal accumulated temperature, Setting percentage, Empty grain percentage

YU Sha, LU Kui-dong, XIE Bai-cheng, HU Xue-yuan, HUANG Wan-hua. Effects of High Temperature Hours and Thermal Accumulated Temperature on Seed Setting Rate of Super Hybrid Rice[J]. Chinese Journal of Agrometeorology, 2016, 37(04): 454-463.

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