1.选择合适地块,安排好隔离区向日葵为异花作物,是典型的虫媒花,主要靠蜜蜂等昆虫传粉结实。因此向日葵制种要比风媒花和自花授粉作物杂交制种要求有更严格的隔离条件。一般制种田与周围向日葵生产田及房前屋后零星种植的向日葵最少要有3,000米隔离距离,才可能保证制种纯度。夏播制种时,温度高、降 1. Select the appropriate block, arranged isolation zone Sunflower is a cross-species crops, is a typical insect flower, mainly by honey and other pollinators strong. Therefore, the production of sunflower than the wind flower and self-pollination hybrid seed production requirements have more stringent isolation conditions. General farming and sunflower fields around the production plant and the back of the house before and after the planting of sunflowers at least 3,000 meters isolation distance, it is possible to ensure seed purity. Summer planting species, the temperature is high, down