在大田放养红萍,适宜的生长温度是15-30℃,以20-25℃生长最好,繁殖最快。在15℃以下,随着温度的下降,繁殖速度也下降,在5℃以下,红萍就基本停止生长。如果温度降至-3℃,在萍面上撒施草木灰,可以保持72小时不致冻死。根据这样的规律,在近几年来,我们在冬春期间,坚持放养红萍,除特殊的恶劣天气外,各生产队都能养好红萍,为农业提供了大量绿肥。主要放养技术是: 一、选择适宜的萍母田红萍适应性较广,对土壤条件要求不高,在酸碱度中性或微酸性的土壤也适宜生长。但作为萍母田则选肥力中等以上的沙壤土,水质较好,排灌方便的农田为宜。在冬季为了减少 Red-leafed stocking in the field, the appropriate growth temperature is 15-30 ℃, the best growth at 20-25 ℃, the fastest breeding. Below 15 ℃, with the decline of temperature, reproduction rate also dropped below 5 ℃, Hongping basically stopped growing. If the temperature drops to -3 ° C, apply ash on the surface of the flat and keep it for 72 hours without freezing. According to this law, in recent years, during the winter and spring, we insisted on stocking red weeds. Except for special bad weather, we were able to support Hongping with various production teams and provide a large amount of green manure for agriculture. The main stocking techniques are: First, the appropriate choice of Pingtang Tian Hong Ping wider adaptability, less demanding on the soil conditions, the pH of the soil is suitable for neutral or slightly acidic soil growth. However, as the Pingtung field is selected medium fertility and above sandy loam, water quality is better, irrigation and drainage of convenient farmland is appropriate. In winter in order to reduce