为了开辟新的油料来源,我县从1976年起大面积引种油用向日葵,主要品种是罗马尼亚杂交种“跃进1号”。近两年来向日葵生产中一个突出问题是空壳现象比较严重,结实率低,1979年,由于向日葵空壳,一般减产30—40％,严重的达50—60％以上。 In order to open up a new source of oil, my county from 1976 introduced a large area of ​​oil sunflower, the main species is the Romanian hybrid “Yuejin 1”. In the past two years, a prominent problem in the production of sunflower is that the phenomenon of shell is serious and the rate of fruitfulness is low. In 1979, due to the empty shell of sunflower, the yield was generally reduced by 30-40% and seriously to 50-60%.