夏玉米在目前栽培条件下，高肥水地已达到每667平方米40O～500千克高产水平。但我们近几年的生产实践证明高水肥地采用配套的栽培措施可继续提高产量，达到600千克以上的水平。其栽培措施为：一、选用优良杂交玉米种子要达到600千克以上的产量水平，首先应选用竖叶型玉米杂交种 Summer maize under the current cultivation conditions, high fertilizer and water has reached 40O ~ 500 kg per 667 square meters high yield level. However, in recent years, our production practices have proved that the high-water and fertile cultivation practices can continue to increase production to over 600 kilograms. The cultivation measures are: First, the selection of fine hybrid corn seeds to achieve more than 600 kg level of production, the first choice should be vertical leaf corn hybrids