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氮在水体中以氮气、游离氨、离子铵、亚硝酸盐、硝酸盐和有机氮的形式存在。其中游离氨和离子铵被合称为氨氮。水体中只有以NH4+、NH2-和NO3-形式存在的氮才能被植物所利用。水体中其它形式的氮不能被浮游生物所利用,并且会对池鱼产生危害。一、水体氮的来源鱼池中施入大量畜禽
Nitrogen is present in the water as nitrogen, free ammonia, ionic ammonium, nitrites, nitrates and organic nitrogen. Among them, free ammonia and ionic ammonium are collectively referred to as ammonia nitrogen. Only nitrogen in the form of NH4 +, NH2- and NO3- can be used by plants. Other forms of nitrogen in the water can not be used by plankton and can be harmful to pond fish. First, the source of water Nitrogen fish pond into a large number of livestock and poultry