水草是鱼苗培育的天敌。特别是(鱼贵)鱼草、丝草、苦草,它们拔肥强,生长迅速,繁殖快。如果不及时除掉,将严重影响当年鱼种生产。想要人工除掉它们,既费时又费工,常常是除掉前面的又长出了后面的,施肥投饵也往往是肥了水草、瘦了鱼苗。近年来我采用碳铵除水草,收到了良好的效果。它的特点是:除草速度快,培水效果好省工又省时,一举多得。其方法是:先将池水升高到刚好淹没水草为止。选择在睛天的中午按每亩1m水深用碳铵 40—50kg满池泼洒。连续几个睛天后,碳铵通过分解,水质迅速变黑或变绿。当水中的透明度在20～30cm左右时,阳光照不到水草,使水草得不到光合作用而慢慢腐烂。这样,既除掉了水草,又培肥了水 Waterfowl is the foe breeding natural enemies. Especially (fish expensive) fish grass, silk grass, bitter grass, they pull strong, rapid growth, rapid propagation. If not removed in time, it will seriously affect the production of fish species. You want to remove them manually, both time-consuming and laborious, often get rid of the front grow out behind, fertilizing feeding is often fat plants, lost fry. In recent years, I use ammonium bicarbonate in addition to water, received good results. It is characterized by: weeding speed, water-saving effect of labor-saving and time-saving, in one fell swoop. The method is: first raise the water to just submerged plants. Choose at noon on the day by the depth of 1m per acre with ammonium bicarbonate 40-50kg full pool splashing. After several consecutive days, the ammonium bicarbonate is decomposed and the water rapidly turns black or green. When the transparency of the water in the 20 ~ 30cm or so, the sun shines on aquatic plants, so that plants do not photosynthesis and slowly decay. In this way, not only aquatic plants are removed, but fertilized water is also used