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Hey guys I have a quick question about flourish nitrogen. When I am doing nitrogen tests should I be testing for K2O which is what I believe it provides (under the guaranteed analysis on the website) or should I be testing for KNO3 which is what I see everyone else testing for. I'm pretty sure the answer is K2O but I would just like to make sure. Thank you
 

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From Wikipedia:

"The chemical formula K2O is used in the N-P-K (nitrogen-phosphorus-potassium) numbers on the labels of fertilizers. Although K2O is the correct formula for potassium oxide, potassium oxide is not used as a fertilizer in these products. Normally, potassium chloride, potassium sulfate, or potassium carbonate is used as a fertilizer source for potassium. The percentage of K2O given on the label only represents the amount of potassium in the fertilizer if it was in the form of potassium oxide. Potassium oxide is about 83% potassium by weight, but potassium chloride, for instance, is only 52% potassium by weight. Potassium chloride provides less potassium than an equal amount of potassium oxide. Thus, if a fertilizer is 30% potassium chloride by weight, its standard potassium rating, based on potassium oxide, would be only 19%."

Long story short, test for nitrates. Potassium test will also help you determine if you have sufficient potassium.
 

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Flourish Nitrogen: http://www.seachem.com/Products/product_pages/FlourishNitrogen.html

F. Nitrogen contains nitrate and ammonium for nitrate sources. Their website says to double your nitrate reading for a good approximation of the total nitrogen.

"Flourish Nitrogen™ is a concentrated (15,000 mg/L) blend of nitrogen sources. It provides nitrogen in both the nitrate form and the plant-preferred ammonium form. ... Because one-half of the nitrogen in Flourish Nitrogen™ is from nitrate you can get a reasonable estimate of nitrogen levels by doubling a nitrate reading, ..."
 
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