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Phosphorus Deficiency in Plants

Notes on Phosphorus Deficiency in Plants:

Phosphorus is a macronutrient.

Reddish or purple leaves and joints. Leaf tips can have brown or black spots if they are older. There will also be reduced growth, fruit or seed production.
If pH is around 6.5, the phosphorus in the water will be available to the plants. Bone, Greensand, crickets.
Phosphorus is toxic to fish, so you should not add large quantities to an aquaponics system. PH affects how the plants can absorb phosphorus.
Beware of heavy metals being added to a closed loop system. Many of the commercial fertilizers might contain other chemicals that will ruin an aquaponics system.
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