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青海省德令哈农场位于柴达木盆地东部,拔海二千八百公尺以上,生长期短,冰冻期长,每年三月下旬土壤始渐解冻,到九月中下旬,土壤又复冻结。这样短促的生长期,成为作物生长的限制因素。历年的播期试验都肯定了早播增产的效果,但每年因气候、机具、劳力的限制又不得不把播期推迟,所以如何提早播种时间就成为增产的关键。从
The Delingha Farm in Qinghai Province is located in the east of the Qaidam Basin and stretches more than 2,800 meters above sea level with a short growth period and a long freezing period. The soils begin to thaw gradually in late March each year. . Such a short period of growth has become a limiting factor for crop growth. The sowing date experiment all confirmed the effect of early sowing and yield increasing, but the sowing date had to be postponed due to the limitation of climate, machinery and labor every year. Therefore, how to sow the sowing time early became the key to increase yield. From