Why do I need to up my nitrates?
Here’s a question for all you plant guru’s?
Ok in terms of N as NO3-, I add 7 ppm per week as a dose and take out 20% of my water.
So after one week (assuming no plant uptake) I have:
(0 + 7 )* .8 = 5.6 ppm
After two weeks I have:
(5.6 + 7)*.8 = 10.08 ppm
After three weeks I have:
(10.08 + 7) * .8 = 13.66 ppm
After a while my tank will reach equilibrium at 28 ppm:
(28 + 7) * .8 = 28 ppm
In actual fact after doing this for a long time in a very heavily planted tank, my tank water reaches equilibrium at about 18 ppm. (I am using a calibrated test that has a precision of better than +/- 1 ppm). This means that my plants are only taking out about 2.5 ppm of nitrate nitrogen per week:
(18 + 7-2.5)*.8 = 18 ppm
OK now my plants are growing gagonza fast almost doubling in a week! Why do I want to up my NO3-?
If you play with chemicals you should know some chemisty.