玉米品种区域试验是品种选育和推广的桥梁 ,也是种子企业引进推广新品种 ,抢占种子市场 ,提高生产经营效益的重要依据。由于玉米区域试验是在生产环境的田间进行 ,受自然、人为、种子本身质量和地下害虫等因素的影响 ,试验条件不易控制。试验播种后出苗或定苗时 ,常会在一些个 Regional testing of maize varieties is a bridge for breed breeding and promotion. It is also an important basis for seed enterprises to introduce and popularize new breeds, seize the seed market, and improve the efficiency of production and management. As the regional test of corn is conducted in the field of production environment, the test conditions are not easy to control due to the factors of nature, man-made, the quality of the seed itself and the underground pests. After the test of seedling emergence or Dingmiao, often in a few