Wow, that is really interesting about the ph. Great research!. My ph probably drifts from 6.2 - 6.5 on average and I always thought that was fine but perhaps that's the source of my nutrient deficiency. I just dropped the ph down to 5.7 and will aggressively monitor it. From looking at that chart it does appear that phosphorous is not well absorbed at a ph of say 6.3 and there is a big difference between 6.3 and 5.7. I might even try 5.5 but for now I will start at 5.7.
The nutrients I am using are a 7-11-27 and I add calcium nitrate at about half the rate of the hydroponic nutrient. So if I add say 5ml of the hydroponic nutrient I will add 2.5 ml of the calcium nitrate. The hydroponics guy at the store said "that should be about right" but I guess it depends on what you are growing. Calcium doesnt appear to be my issue at the moment.
Contentration of hydroponic nutrients:
Total Nitrogen (N) - 7%
Available Phosphoric Acid - 11%
Soluble Potash - 27%
Magnesium - 3.75%
Sulphur - 4.8%
Iron - 0.1%
Manganese - 0.085%
Zinc - 0.03%
Boron - 0.0273%
Copper - 0.0041%
Molybdenum - 0.009%
Chelated metal complex of diethylene triamine pentaacetate DTPA minimum content - 0.7%
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