I'm currently dosing my tank the EI way with KN03, KH2P04 and Traces. I cannot find K2S04 around here. So I was wondering if the K would be sufficient from both those chemicals.

Any ideas on where to get K2S04?

YT have K2SO4 in his shop the last time I went there.

Cruise, i got replied you in other forum. Ya...forgotten yt hv that. Saw the whole bucket full with small cans of K2SO4. But do remember the N and K do work together with P...

BTW. A side question, where can you get KH2PO4?

I got KH2P04 from a forum member on this board, Alex_T, for RM8 for a 100g tub. Check the Classifieds. I'm sure he's still got some.

According to Barr's EI method, K from KNO3 is sufficient for most setups.
Adding extra K won't do any harm. But if you are dosing KNO3 (EI method), K level should be good. Thus extra K is not needed.

cjloong: KH2PO4 is still available. Just drop me a line.

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WTS: Chemical Fert KNO3, KH2PO4

According to Diana's method. NPK do work together to get better result. That's why most of the fertilizer contained NPK. instead of just K, just P or just N only.

These are called macro nutrient... so the plants need all three of them...

I am using the nutrafin, it is actually called NPK ... so all three is there and nothing else...



Stanley

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http://plantedtank.blogspot.com

Exactly. N,P,K are the basic macro nutrient that are need by plant to grow.
By limiting either one element, the nutrient uptake will be inbalance. Thus it is important to introduce all three macro to the tank.

If you are dosing KNO3 and KH2PO4, meaning you are already dosing NPK.
N (from KNO3), P (from KH2PO4), K (from KNO3 and KH2PO4).

Now, I believe Cruise Control question is, whether the K level is sufficient from these elements. Do we need to add another source for K.

Yes, you can add. Won't be any harm if you overdose K. But unless you notice any sign of K deficiency (holes in leaves, etc..), one really seldom need to add EXTRA K.

In special cases, where the gH is too low (gH<3), one can add K from another source (K2SO4, etc)

I haven't done any experiment on these findings. I read from people who had done it, and have great results. Diana Walstad and Tom Barr's method a bit different. One is lowtech setup (Walstad), and one is hightech setup (Barr), however the fundamentals are the same. Without any of the NPK + Traces, plants will surely suffer.

But the real question is, at what concentration level of these elements, are consider "optimum" for plant growth and at the same time avoid algea?

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WTS: Chemical Fert KNO3, KH2PO4

Yeah, I don't seem to have any K deficiencies at the moment but just wanted to make sure I had all bases covered. Thanks!

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Cheers,
Nathan