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**To**:**Aquatic Plants Digest <Aquatic-Plants at actwin_com>****Subject**:**Re: Confusion/questions on dosing Seachem Nitrogen...****From**:**Chuck H <grendel at usit_net>**- Date: Thu, 30 Jan 2003 17:21:51 -0500

Jeff wrote of Seachem's Flourish Nitrogen: >Directions state: > >"DIRECTIONS: BEGINNER: Use 0.5–1 mL (dispenser enclosed) for each 80 L (20 >gallons*) twice a week. EXPERT: The beginner dose raises nitrogen by the >same degree that 0.45–0.90 mg/L nitrate would. This dose is sufficient to >provide approximately 4 g of growth (dry) or about 20 g (hydrated) over a 1 >month period (assuming all other necessary nutrients are provided). For >increased growth use proportionately more. To target a specific nitrogen >increase, dose according to the following formula: 0.25vn=m, where v= volume >of tank in gallons*, n=desired nitrogen increase (for a desired nitrate >increase use a factor of 0.05 instead of 0.25 in the formula) and m=volume >of product to use in mL. For example to raise 20 gallons* by 0.20 mg/L >nitrogen you would use: 0.25*20*0.20=1 mL. (For 2 & 4 L containers, 1 capful >is 10 mL)." > >Now, onto my problem and where the confusion arises... > >I want to keep approximately 5ppm of N available for plant intake. > >According to my estimates, should I use the beginner dosage in my 50G (55G - >estimated gravel volume) tank, I would add about 2.5ml twice per week. Or as >I read it the beginner dose yields almost 1ppm of available N (added twice >per week) - hardly anywhere near a sustained level of 5ppm. > >Drawing a straight line from here (the beginner dose) to get a 5ppm N would >mean I would add 5x this amount, or 12.5 ml (assuming of course that N >depletes over the week or at water changing time) twice per week, or 25 ml >per week. > >IF I follow the "Expert" directions, to reach a 5ppm of available N, I would >use the formula: >0.25vn=m - For my tank and 5ppm desired N this reads > >0.25 x 50 x 5 = 62.5 ml initial dose.... Wow, am I glad I bought the 2L >bottle!!! > >And 12.5ml (or 25ml using the 2x dose per week) is quite a ways from >62.5ml... Does anyone have any practical experience dosing this stuff >(assuming a medium-heavily planted tank...). You're on the right track, but remember that you're after the equivalent of 5ppm NITRATE. The "expert" formula yields the dosage required to achieve a specific level of NITROGEN, not nitrate. So, you should use a factor of 0.05 instead of 0.25 in the formula to determine nitrate (0.05vn = m). During the beta test, I simply divided the result of 0.25vn=m by 4.4 to get nitrate equivalency. This method yields a slightly higher number than the formula 0.05vn=m does, but either way should work fine. -- Chuck Huffine Knoxville, Tennessee

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