1983年以来,每年冬季都在雷州半岛进行大规模的杂交水稻制种,面积达3～4万亩。雷州半岛已发展成为一个重要的制种基地。由于冬季制种播期提早,经常出现低温阴雨天气,烂秧非常严重。1983年4万多亩制种田,父本死秧率几乎达100%,1984年1万多亩制种田,死秧率达30%以上;近两年,死秧 Since 1983, every winter, large-scale hybrid rice production has been conducted in Leizhou Peninsula, covering an area of ​​3 to 40,000 mu. Leizhou Peninsula has developed into an important seed production base. As the early sowing of winter seeding, low temperature rainy weather often occurs, rotten seedling is very serious. In 1983 more than 40,000 mu of farming, the death of the father rate of almost 100% seedlings, 1984 10,000 acres of farming, dead seedlings rate of 30% or more; the past two years, dead seedlings