绿萍大面积推广在于抓好保萍越冬。以往各地都采用露天覆盖薄膜的办法进行越冬,不但比较麻烦,而且成本也高。富阳县场口公社场口大队农科队,于1974年开始,试验用塑料薄膜袋藏绿萍越冬,经过几年实践,试验基本成功。这项方法简单易行,省工、省肥、成本低,管理简便。具体方法如下: 一、适时采种:绿萍应适时采种,采种过早,由于气温较高,容易引起烂种;采种过迟,萍体受到冻害,不利越冬。最好应在当年12月下旬,选择生长厚实、颜色为红色、老健、无病虫害的绿萍作为萍种。二、越冬方法:先将捞集的萍种,用清水洗去污泥,除掉杂物, Luping large area promotion is to do a good job in the winter. In the past, all over the world adopt the method of open-air cover film for winter, which is not only troublesome but also costly. Fuyang County market port communes market port brigade Agricultural team, started in 1974, experiment with plastic film bagged green wintering, after several years of practice, the test was basically successful. This method is simple, labor-saving, fertilizer, low cost, easy management. The specific methods are as follows: First, the timely seed: green shrimp should be timely mining, early mining, due to higher temperatures, likely to cause bad seeds; seedling too late, Ping body suffered frost damage, adverse winter. The best should be in late December of that year, choose to grow thick, color is red, old health, no pests and diseases of the green as the Ping species. Second, the winter approach: first set of species of Ping, washed with water to remove sludge, remove debris,