徐淮地区夏玉米种植面积约占玉米面积的80％。常年因夏季雨水集中;地下水位增高而导致涝渍害,对产量影响很大。为此,我们在玉米涝渍危害的地区,进行了夏玉米涝渍形成条件,危害症状、危害时期及其生理反应的研究,并从耕作、栽培、选用品种等方面探讨了综合防御措施。 (一)夏玉米涝渍危害的主要时期 徐淮地处瞬温带,受季风影响很大,常年降雨以7月中下旬为高峰期。由于地势低平,大约有四分之三水分是经过土壤——植物系统贮存,成为地下水。仅有四分之一水分以径流形式入海。据张集水文站1974～ Xuhuai summer corn acreage accounts for about 80% of the area. Perennial rain due to summer concentration; increased water table caused by waterlogging, a great impact on the yield. For this reason, we studied the formation conditions of summer corn waterlogging, the symptoms of harm, the period of harm and their physiological responses in areas harmed by corn waterlogging, and discussed the integrated defensive measures from aspects of farming, cultivation and selection of cultivars. (A) the main period of summer corn waterlogging hazards Xuhuai is located in the instantaneous temperate zone, monsoon affected greatly, perennial rainfall in late July as the peak. Due to the low level, about three-fourths of the moisture is stored in the soil-plant system and becomes groundwater. Only a quarter of the water enters the sea as run-off. According to Zhang Ji hydrological station 1974 ~