Hello kr3t3n,
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Since different plants have different ph and nutrient needs, how would they grow with one source (the pond would have some mid-point ph level around 6 and nutrient for the plants)?
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The same way they would trying to grow various kinds of vegetables using one reservoir and nutrient solution. Some plants will do better than others, and some will suffer more than others.
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Some plants require higher levels of certain nutrients, is it possible to plan how much the plant is going to "eat"? In terms of nutrient and overall water?
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Water consumption will be predictable. Nutrient uptake can be as well. However I don't think your referring to nutrient uptake, but rather nutrient manufacturing/concentrations.
Aquaponics is a living ecosystem that is constantly converting organic mater into the raw chemical elements the plants can absorb. Predicting the concentrations of each of the 13 necessary nutrients at any given time may be possible to some extent. But not an easy task and taking a lot of experience. Hear's a forum about aquaponics "
Backyard Aquaponics" as well as a list of other resources on aquaponics I listed here
A few sources of info on Aquaponics