chuck' s fert calculator - The Planted Tank Forum
Old 04-04-2004, 02:30 PM Thread Starter
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how come when you set up everything for potassium nitrate, add dry, and 30 gallons of water. then you put .25 tsp it says it will add 5.38 approximately, but when you put .5 tsp it will add 16.... something ppm I forget.

shouldn't it just be double the .25tsp...

maybe this is something that I am overlooking... can someone clarify for me?
thanks
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Old 04-04-2004, 02:56 PM
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Try using gram instead of tsp. Chuck calc. always round up the numbers to the closest gram without decimal. If you check between 3 gram and 6 grams, the ppm is exactly doubled.
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Old 04-04-2004, 03:28 PM Thread Starter
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ahh
ok.. thanks ninoboy... much appreciated
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Old 04-04-2004, 03:54 PM
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What I do to get around this is put in 10 or 100 times the teaspoon amount then move the decimal over accordingly for the result. For example, instead of .25 tsp I enter 25 tsp and adjust the grams up or down one until it is the closest to actually 25 tsp. Then take the ppm result and move the decimal over 2 places to get the result of adding 0.25 tsp.

Tony
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Old 04-05-2004, 02:38 AM
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Quote:
Originally Posted by loachman
how come when you set up everything for potassium nitrate, add dry, and 30 gallons of water. then you put .25 tsp it says it will add 5.38 approximately, but when you put .5 tsp it will add 16.... something ppm I forget.

shouldn't it just be double the .25tsp...

maybe this is something that I am overlooking... can someone clarify for me?
thanks
How did you get all these numbers?

When you setup the calculator with potassium from KNO3:
0.25tsp = 4.75ppm K
0.5tsp = 9.51ppm K

When you setup the calculator with nitrate from KNO3:
0.25tsp = 7.53ppm NO3-
0.5tsp = 15.06ppm NO3-
(All used with 30 gallons and dry dose)

In each case, the ppms double just as they should when the dosage is doubled. You must have mistyped or not kept all the variables constant.
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Old 04-05-2004, 03:30 AM
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rolo on the chucks calculator i added .25 tsp of nitrate and it gives me 5.38 ppm for 30 gal and .50 gives me 16.13 ppm and for the k .25 says its 3.39 ppm .50 its 10.18 ppm why is your calculator different then the one i have ???? so witch one is right
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Old 04-05-2004, 03:50 AM
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Old 04-05-2004, 04:13 AM Thread Starter
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Old 04-05-2004, 04:16 AM Thread Starter
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ok nevermind guys, I went to the webiste and saw that there was an update...

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Old 04-05-2004, 04:55 AM
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Ditto that. I have the newest updated version: 1.0c, Mar 7, 2004. I guess this fixed the error you guys found.
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