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玉米源于热带,要求较高的温度,但适应性强,在温带最热月平均气温高于20℃的地区能广泛种植,在中、低纬度可种到海拔2600—2800米的高地、高原。玉米喜高温,低于6℃不发芽,一般10℃左右发芽。低于15℃叶绿素不能进行正常的生理活动,低于16℃灌浆极慢,低于20℃光合成急降,物质运转迟缓。抽穗、开花要求24—26℃。玉米是属C_4作物,光饱和点高、补偿点低。单叶最大光合能力为60—80毫克/分米~2/小时,最强光照时群体也不显光饱和点,幼龄光合能力差。最适于光合成的温度为30℃—40℃。世界个别高产地块玉米最大的叶面积系数(LAI)可达8—10,
Corn originates in the tropics and requires a higher temperature, but its adaptability is strong. It can be widely planted in areas with the warmest average temperature in the temperate zone higher than 20 ℃, and can be planted in the heights of 2600-2800 m above sea level in the middle and low latitudes. . Hi like corn, less than 6 ℃ does not germinate, usually about 10 ℃ germination. Chlorophyll below 15 ℃ can not be normal physiological activities, less than 16 ℃ grouting very slow, less than 20 ℃ photosynthetic plummeting, slow-moving substances. Heading, flowering requires 24-26 ℃. Corn is a C_4 crop with high light saturation point and low compensation point. Leaf maximum photosynthetic capacity of 60-80 mg / dm ~ 2 / h, the strongest light when the population does not show light saturation point, poor young photosynthetic ability. Most suitable for light synthesis temperature of 30 ℃ -40 ℃. The world’s individual high yield plots corn maximum leaf area index (LAI) up to 8-10,