To clarify the optimal water management in large-scale fields under high temperatures at the ripening period, effective water managements during this period for improvement of yield, appearance quality and palatability were investigated. Compared with intermittent irrigation and flooded irrigation, the soil temperature with saturated irrigation remained low throughout the day, and the decrease rate of the bleeding rate of hills was the lowest. These results suggested that the saturated irrigation maintained root activity. For the three irrigation types, the number of spikelets per m² and 1000-grain weight were similar, however, saturated irrigation resulted in significantly higher rice yield due to improvement in the percentage of ripened grains. The saturated irrigation produced a high percentage of perfect rice grains and thicker brown rice grain, furthermore, the palatability of cooked rice was excellent because protein content and hardness/adhesion ratio were both low. Thus, under high-temperature ripening conditions, soil temperature was lowered and root activity was maintained when applying saturated irrigation after heading time. The results indicated that saturated irrigation is an effective countermeasure against high-temperature ripening damage.

为了明确成熟期高温下大田的最佳水分管理，研究了该时期有效的水分管理，以提高产量、外观质量和适口性。与间歇灌溉和漫灌相比，饱和灌溉的土壤温度全天保持较低，丘陵泌水率下降率最低。这些结果表明饱和灌溉保持了根系活动。对于三种灌溉类型，每米²的小穗数和千粒重相似，但饱和灌溉由于提高了成熟粒的百分比而显着提高了水稻产量。饱和灌溉产生了高比例的完美米粒和更厚的糙米粒，此外，由于蛋白质含量和硬度/粘附比都低，因此米饭的适口性非常好。因此，在高温催熟条件下，抽穗期后进行饱和灌溉时，土壤温度降低，根系活动得以保持。结果表明，饱和灌溉是对抗高温催熟危害的有效措施。