Aqua Man
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Nope your pretty right and each source of nutrients are different so different forms of calcium have different % of available Ca. Then the rest will need to be broken down into an available form. This is partly why microbes are beneficial in all grows, synthetic and organic and why things like humic and fulvic acid also. Then the PH also has an affect on availability by changing the forms... CEC, temp... the list goes on when it comes to availability not just microbes.I know in the US our labeling is different. So anything in the label is whats available right away for the plant the rest comes frome the breakdown from the microbes.
The npk on the labels in the us is what is available right away
The npk for international labeling is different most have laws that the total amount in mix is displayed o the label....with that said you can look at US labels and that will tell you what is available right away to the plants. Proportionately the microbes might be only breaking down 30% at most....thats how i understand it. Am i missing something aquaman?