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郑单八号,是我省农科院新培育的玉米杂交种。1985—1986年河南省和北方几省(河北、山东、河南、陕西等省)夏玉米区试,均居参试品种之首位。比郑单二号增产29.8～36.4％,比鲁原单八号增产15.1％。该品种株型紧凑,叶片上冲,茎杆坚韧,抗病抗倒,结实性好,出籽率高,适应性强,生育期90天左右。为探讨郑单八号的增产途径,1985—1986年,我们对该品种进行了密度试验,对其群体进行统计分析,并提出增产措施。试验设在本所试验场,土质壤土,地力中等,前作小麦单产300公斤以上。1986年进行大面积同步示范推广,取得了明显的经济效益。一、试验结果及分析
Zheng No. 8, is a new hybrid corn cultivated by our province Academy of Agricultural Sciences. 1985-1986 Henan Province and the northern provinces (Hebei, Shandong, Henan, Shaanxi and other provinces) summer corn area test, ranking the first test varieties. A 29.8 ~ 36.4% increase over Zheng Dan’s No. 2 and an increase of 15.1% over No. 8 of Luyuan. The plant type compact, leaves on the red, stem tough, resistant to lodging, good seed, high seed yield, adaptability, the growth period of about 90 days. In order to explore the way to increase yield of Zheng No. 8, from 1985 to 1986, we conducted density tests on this variety, conducted statistical analysis of its population, and proposed measures to increase production. The test is located in our test site, soil loam, middle ground, before the yield of more than 300 kilograms of wheat. In 1986 a large area synchronous demonstration and promotion, and achieved significant economic benefits. First, the test results and analysis