"Wellman" wrote in message
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"Marcus Fox" wrote in
message ...

"Wellman" wrote in message
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What are the 3 numbers on some plant fertilizer bottles? The Plant
Gro
one
I have says 0.15 - 0 - 0.

Martin


The numbers mean N-P-K (nitrogen, phosphorus, potassium).

In this case you have 0.15% nitrogen (as water soluble organic nitrogen
as
a
chelated agent), no phosphorus and no potassium. You will also have some
chelated iron, and small amounts of chelated and soluble manganese,
chelated
and soluble zinc, and trace amounts of boron, chelated copper and
chelated
molybdate.

Marcus

What roles do the nitrogen, phosphorus, and potassium play?

Plant nutrients. They are required for plant growth. However, excessive
phosphorus will cause an algal bloom in your tank.

Marcus