关键词: 早稻, 春季低温冷害, 评估模型

Abstract:

In order to provide an objective and quantitative reference for early rice yield prediction，based on the meteorological observation data of Quzhou in April 2015 and 2016, the comprehensive evaluation index was calculated according to the model of low temperature damage in early rice seedling stage, and applied in actual production. The results showed that the evaluation model was objective, effective and feasible, which was suitable for popularization and application in production. Through comprehensive evaluation model calculation, the comprehensive evaluation index of chilling injury of early spring rice in Quzhou in 2015 was 0.3, and the cold disaster intensity of early spring in spring was slight. The comprehensive evaluation index of chilling injury of early spring rice in Quzhou in 2016 was -1.5, and early spring chilling injury did not occur. Although in early April 2015 the city continued rainy weather and 2 consecutive rainy days occurred in April 2016, but the overall temperature was higher, and there was no death seedling and rotten seedling in two years. The quantitative evaluation of early rice seedling from chilling injury would help us to deal with the threat of serious chilling injury in spring, and is of great significance to guarantee the safety of grain production.

Key words: early rice, spring chilling injury, evaluation model