杂交中稻是四川省泸县的主要一季作物。在杂交中稻正处于抽穗到扬花的关键时期，常遇涝灾，淹没时间长的田块往往造成绝收。为使中稻在灾年夺得好收成，一般在水稻抽穗至扬花期被洪水淹没２０ｈ以内时，不必改种其他作物，因为水稻被水全淹没２０ｈ以内仍有６０％的收成；... Hybrid mid-season rice is the main seasonal crop in Lu County, Sichuan Province. Medium hybrid rice is heading for a critical period of flowering, often floods, flooded fields often result in a long harvest. In order to achieve a good harvest of middle rice in the disaster year, it is generally not necessary to re-plant other crops within 20 hours after the heading date of flowering is up to the flowering period of flood paddy because 60% of the harvest is still within 20 hours.