关键词: 水稻, 灌溉方式, 高温, 秧苗

Abstract:

In order to provide technical reference for reducing the injury of high temperature on late rice seedlings, four later season rice cultivars, Tianyouhuazhan, Wuyou 308, Yongyou 538 and Jia 58, were used to study the influence of high temperature on machine transplanting late rice under different irrigation methods. The results showed that, compared with silent water irrigation, cyclic flowing water irrigation significantly reduced high temperature injury. Under the condition of air temperature of 40℃, cyclic flowing water irrigation improved the seedling quality. Compared with the silent water irrigation, cyclic flowing water irrigation increased seedling dry weight and SPAD value by 28.33% and 3.73% respectively, meanwhile the ratio of yellow leaves declined by 41.66%. The main reason for reducing the high temperature injury of seedling was that cyclic flowing water irrigation treatment reduced soil temperatures and water temperatures, and the soil temperature was 1℃~2℃ lower than that of silent water irrigation, while the daytime water temperature was decreased by 10℃~11℃. The study shows that in late rice transplanting, cyclic flowing water irrigation could alleviated high temperature injury, and speed up the green returning and growth of rice.

Key words: rice, irrigation method, high temperature, seedling