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张掖县位于甘肃省西北部,河西走廊中段,祁连山北麓,地势由西南向东北缓倾。川区拔海高度为1412—1700米,是依靠祁连山融雪的灌溉农业区,主要气候特点是光能丰富日照长,热量不多温差大,降水稀少变率大,大陆性气候显著灾害多。近几年来玉米种植面积9—11万亩,占秋粮作物面积的62—66％,总产量占秋粮总产的70—72％。1971年单产只有351斤,1980年达892斤,产量很不稳定。因此,我们分析玉米生育期间对热最条件的
Zhangye County is located in the northwestern Gansu Province, the middle Hexi Corridor, the northern foot of the Qilian Mountains, the terrain from southwest to northeast gentle dumping. The elevation of Bahai District in Sichuan Province is 1412-1700 meters. It is an irrigated agricultural area relying on snowmelt in Qilian Mountains. The main climate features are long light-abundant sunshine, large amount of heat with little difference in temperature, large amount of precipitation and large variability, and significant continental disasters. In recent years, corn planting area of 9-11 million mu, accounting for 62-66% of autumn crop area, the total output of 70-72% of total autumn grain output. In 1971, the yield was only 351 kg, up to 892 kg in 1980, the output was very unstable. Therefore, we analyze the most favorable conditions for heat during maternal growth