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Cation Ratio's - How Important is It?

Earlier I wrote that I felt major supplement ions of Ca, Mg, K
should be dosed relative to Na and that "I would try to keep
the ions of Na, Ca, Mg, and K in a proportion of 4:2:1:1". This
should have been 8:2:1:1.

Implicit here is not that the numbers be _exactly_ in proportion,
just that a strong deviation from this ration in the water column can
have the effect of adding to the osmotic pressure gradient within
the plant enough to slow _all_  ion flow, effectively creating a
deficiency even when enough nutrient exists in the water column.

Christopher Coleman
christopher.coleman at worldnet_att.net