抓好种源加强亲本管理不断提高玉米杂交种质量吕清明陈佳敏内蒙古赤峰市种子公司赤峰种子联营公司是以赤峰市种子公司为主体公司，联合八个旗、县、区公司组成的，以“四统一”（即亲本统一，计划统一，价格统一，销售统一）和“七二一”比例合理分配利润为联营基础而组成... Do a good job of provenance to strengthen the parental management continue to improve the quality of hybrid corn Lu Qingming Chen Jiamin Inner Mongolia Chifeng Seed Company Chifeng Seed Associates Chifeng Seed Company is the main company, a joint eight flags, counties and districts of the company, the “four Unified ”(that is, the unity of the parent, the unification of the plan, the unification of the prices, the unification of sales), and the“ 7-21 ”ratio of reasonable distribution of profits for the foundation of the joint ...