一、引言: 玉米是绥化市主要粮食作物,产量高低对粮食总产关系极大。近几年因为玉米品种熟期太早、不抗病产量一直上不去,出现了南种北移的局面,多数农户急需种吉字号品种。为了解决这一问题,必须配制吉字号玉米种。但是,无霜期短,用常规办法配制四 I. INTRODUCTION: Corn is the main food crop in Suihua City. The production level has a great relationship with the total grain output. In recent years, because of the maturity of maize varieties is too early, the yield of disease-resistant has been on the increase, there has been a southward shift of the situation, the majority of farmers urgently need varieties of varieties of Ji. In order to solve this problem, we must formulate Yoshida corn varieties. However, frost-free period is short, with the conventional approach to the preparation of four