杂交玉米是利用“杂种优势”来提高产量,我省已有比普通玉米能增产30％以上的例子。但是在河西地区特别是张掖地区增产情况怎样,为此我们进行了试验。一九七三年共试种了九个玉米品种(其中八个是杂交种,一个是当地农家种)共6.23亩。一般的做小区品种比较试验,对其中四个有成熟把握的杂交品种进行了较大面积的生产试验。试验结果七个品种完全成熟,二个品种基本成熟,总产量5893.5斤,平均亩产946斤, Hybrid corn is the use of “heterosis” to increase production, the province has more than 30% of ordinary corn can yield an example. However, Hexi area, especially in Zhangye Prefecture, how to increase production, for which we conducted a trial. In 1973, a total of 6.23 mu of nine maize varieties (eight of them hybrids and one from local farmers) were planted. The general comparison of plots to do varieties of cultivars, four of which have a mature grasp of large-scale hybrid production test. The test results of the seven varieties fully mature, two varieties of basic maturity, the total output of 5893.5 kg, an average yield of 946 pounds,