3 ) a heterotrophic nitrifier , named strain hn , was isolated from the greenhouse soil . the cells of isolates were gram positive , rod or coccus
2.
Because there are a great quantity ' s heterotrophic bacteria in the breeding pool , which will have the repulsion action to the insufficient quantity ' s nitrifier and prevent the nitrification , the situation will bring the accumulating of nitrite which is the middle substance of nitrification in water , the long term accumulated nitrite can debase fish and shrimp ' s disease - resistant and decrease the growth and even die
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