Re:
[quote:163c82ab8f="smgwee"]Thanks again for your prompt reply. I am actually quite puzzled. The usage of KNO3 is usually targeted at the NO3 and it is recommended not to exceed 5ppm (Correct me if I am wrong). At this rate, the K is merely less than 4ppm as compared to the recommended concentration of K in a planted tank. (Usually 20ppm~30ppm)
[/quote:163c82ab8f]
Sia Meng, too much potassium can block uptake of magnesium and calcium. I used to dose K carelessly, thinking that it is one of those "won't cause trouble" ferts. Wrong.
One day, the new leaves of my Echinodorus oriental (which normally grows as hot pink) came out pale. I suspected Iron deficiency so I whack in the Fe. No use. Leaf turned paler as the days go by, and deformed. Aha, calcium deficiency. But how can? I have 5dGH in my water...
Stopped the K2SO4, and the hot pink returned to the new leaves. Too much K.
Warm regards,
Lawrence Lee
brothers, whatever is true, whatever is noble, whatever is right, whatever is pure, whatever is lovely, whatever is admirable--if anything is excellent or praiseworthy--think about such things.
Philippians 4:8
Bookmarks