积温是发展农业生产的一个重要基本条件。对于某一个地区来讲,它基本上是一个“常数”。因此说,积温的高低可以左右粮食的产量。我县常年有效积温在2800℃左右,近几年我们进行南种北移引进推广了玉米新品种。科学的利用了积温,不仅使高产晚熟的玉 Accumulated temperature is an important basic condition for the development of agricultural production. For a particular area, it is basically a “constant.” Therefore, the level of accumulated temperature can affect the output of grain. The effective annual accumulated temperature in our county is about 2800 ℃. In recent years, we have introduced the south species to promote the new varieties of corn in the north. Scientific use of accumulated temperature, not only to make late-maturing jade