1. Yield performance: Shangdao 909 maize varieties participated in the regional test of Huanghuaihai Summer Maize Group Consortium on 20 18-20 19, with an average yield of 656. 1 kg per mu for two years, which was 4.5% higher than that of the control Zheng Dan 958. The production test in 20 19 years showed that the average yield per mu was 667.0 kg, which was 1.4% higher than that of the control Zheng Dan 958.

2. Growth period: The maize variety Shangdao 909 is about 10 1 day, which is about 1.5 days earlier than the control Zheng Dan 958. The summer sowing time of this variety is usually from June 5 to 20.