Dennerle Plant Care N is a nitrogen fertilizer for demanding plant aquariums with low or no fish stocking.Dennerle Plant Care N+ nitrogen fertilizer for heavily planted aquariums+ for the targeted supply of nitrogen (nitrate = NO3)+ for splendid plants and intensive bright colors+ high coverage due to concentrated active ingredients+ scientifically tested and optimizedDosage & Application Dennerle Plant Care N:Dosage as needed 1 ml per 100 l of aquarium water. This dosage increases the water values as follows:Nitrate NO3: 1 mg/l