Quote:
Originally Posted by Ah_ZhaN
Hi Tom, I caculate fert dosage by the mean of fertilator.
http://www.aquaticplantcentral.com/f...fertilator.php
The teaspoon used is a 5ml spoon, those meant for medicine consumption.
However, I had difficulty achieving 20ppm NO3, 2 ppm PO4 and 20ppm K per dosage.
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My tank volume is 25.5 litres(6.375gallon) and lighting is 3.6WPG(US)
My calculated results from fertilator are :
A) 1/8 tsp KNO3 and 1/32 tsp KH2PO4
NO3 = 15.63ppm
PO4 = 4.79ppm (too high?)
K = 11.83ppm
B) 1/4 tsp KNO3 and 1/64 tsp KH2PO4
NO3 = 31.27ppm
PO4 = 2.39ppm
K = 20.7ppm
Should I adopt the dosage from A) or from B) ?? If not, how much tsp of KNO3 and KH2PO4 should I dose to achieve the best results for EI.
Thanks you very much, Tom.
Regards,
zhan |
Hi,
I'm not sure where you get these figures, are they from the same calculator?
Seems odd, but when you get down to smaller units of measure, eg 1/32nd of teaspoon, a lot of error can be introduced.
But if you look at the ranges the dosing produces, 15-30 for NO3, 2-4 for PO4, K+ 10-20ppm, not bad, it's a range, not an absolute measure, none of our test kits generally can achieve that much precision anyway.
If you also add the GH booster suggestions in this, then you will have a higher range of K+, about another 10-20ppm.
I'd general say dose 10 ppm of NO3 and about 1-1.5 ppm of PO4 per dose.
5mls or so of TMG etc.
3-4x a week if very high light, high light 2-3x a week, low light 2x week.
Same amount , just less frequent.
Regards,
Tom Barr