向日葵属菊科向日葵属,具有两性花的特点,是典型的异花授粉植物,自花受粉结实率很低,主要传份途径是昆虫。世界上向日葵杂种优势的利用比玉米晚,对种子田的隔离距离各国有不同规定,也有一些研究,在我国尚缺乏这方面的实践。繁、制种隔离距离是防止生物混杂保证种子质量的一个重要环节。为探讨这方面的问题,我们于1983～1984年安排了隔离距离的试验。但这项试验是一个复因子试验,受隔离距离、风速、地形、污染 Sunflower is a asteraceae Sunflower genus, with the characteristics of bisexual flowers, is a typical cross-pollinated plants, self-pollinated seed setting rate is very low, the main route is through insects. The utilization of heterosis in the world sunflower later than corn, the isolation of seed fields in different countries have different regulations, there are some studies, in our country is still lack of practice. Fan, seed production isolation distance is to prevent biological hybrid seed quality to ensure an important part. In order to explore this issue, we conducted a test of isolation distance in 1983-1984. But this test is a complex factor test, subject to isolation distance, wind speed, topography, pollution