I'm assuming you meant 11 ppm *nitrAte*
All these numbers look good. There is a slight variation depending on which calculator is used but all differences I found were extremely small and your results are consistent. Math looks good.
Note that the KH2PO4 also adds about 1.33 ppm K, probably increase that to 1.4 ppm or so because Chuck's calc outputs slightly higher readings than the one I happened to be using. Just mentioning this because you listed the K levels of KNO3 but not KH2PO4.
yeah, meant nitrate...thanks for pointing that out, corrected.
I was under the impression (likely the wrong one) that the K in KH2PO4 was chemically bound in a way inaccessable to plants. No reference where I got this info, just one of those tidbits you tend to remember. From this point on, I'm going to consider that as bad information, unless someone steps up and confirms it.
I downloaded Chuck's calc for this section and everything looks correct except for your K2SO4 readings. According to Chucks's calc adding 1.25 tsp K2SO4 to 250 ml H20 will yield 0.71 ppm K per ml.
2.11 tsp K2SO4 in 250ml H20 was needed to receive a reading of 1.2 ppm K per ml so you may want to double check that.
Thats the kind of feedback I wanted.
Thanks for double checking my double checking. Will adjust my mixture to 2 tsp. to get 1.13 ppm/ml.
Another consideration. You mentioned that this 5.5g tank is lit by 2 x 13w AH Bright Kits. You did not mentioned Deluxe. Without the AH reflectors I'm not sure this tank qualifies as high light. For example, I have 2 x 13w over a 2.5g tank that gets daily Excel for organic carbon supply and I dose this tank with a standard Ei schedule at 50% normal levels. You are talking about dosing a 5.5g with roughly the same amount of light using the same dosing schedule I use but you are going to be dosing twice the ppm levels. I'm not sure the light level you have requires full blast Ei dosing levels. Are you running Co2 or Excel or any form of Carbon enrichment?
I'm using AH reflectors, and the enclosure is completely lined with mylar. Lights sit about 2.5 inches above surface.
Using a hagen ladder with champange yeast for 3 bubbles/2 seconds ATM. Have an aluminum manifold with clippard valves being built and neoprene tubing on order. 87 pound tank in the garage already running one high light EI tank. (converted argon tank from a welding cart) Hopefully the industrial neoprene tubing will work for this 28' run.
Assuming you make the correction with the K2SO4 you will have successfully scaled down Ei for your tank volume but you can also scale Ei down to lighting intensity as well. Tom developed your original Ei target levels in a very high light tank with very fast growers and with high Co2 levels. If you aren't running Co2 and aren't running high light, you may be able to cut the ppm target levels in half since your plant uptake rates will be much lower.
Ei was designed with no limiting factors in mind, lower light and lack of co2 are limiting factors.
You can continue dosing like you are and watch what happens. If it causes you no problems then it isn't a problem. Ei was designed with a "controlled level of overdose" in mind anyway. Just wanted you to be aware you might be overdosing by twice the needed amount. You can try cutting your dosage down to 2.5ml daily if you're using a graduated dropper. If you are using a cap or whatever to dose you could always measure the volume of liquid you have remaining and then add that volume of water to it to do a 50% dilution and then just keeping the usual 5ml amounts.
Just suggestions. Like I said, if it works, it ain't broke. Just realize that if you start having problems your dosage levels might need to be considered in identifing the cause.
Thanks. You've pretty much confirmed my assumptions, and corrected some of my mistakes. To start I am going to consider this as a high light tank, and I need it to be a high light tank because of what I have growing in it. If need be I can hang a 70 watt MH over the bugger and run open top, and look into a chiller. I just really needed a baseline to get started with that is easy enough to adjust later.