向日葵是典型的异花授粉作物,异交率很高,稍不注意就可能造成种子混杂,影响籽实品质。种子部门要采取有效防杂保纯措施,不断提高种子质量,才能保证向日葵的正常发展,特别是对油用向日葵尤为重要,否则将会降低含油率,增加皮壳率,失去油葵的经济价 Sunflower is a typical cross-pollination crop, a high rate of out-crossing, a little carelessness may cause the seeds mixed, affecting the quality of the seeds. In order to ensure the normal development of sunflower, the seed department should take effective measures to prevent and protect impurities and improve the quality of the sunflower seeds. In particular, it is especially important for oil sunflower. Otherwise, the oil content will be lowered, the husking rate will be increased, and the economic cost of oil sunflower will be lost