Lanthanum for phosphate contol

[Muggle]

Does anyone know if lanthanum chloride, when applied to remove (flocculate) phosphate from irrigation water can be broken/utlized by plants? Have used product to reduce/prevent algae blooms in lakes and ponds, but can't seem to find any literature that states grass/plants can utilize the lanthanum phospahte once applied to the ground.

Thanx,

Dave Orlebeke
Aquatic Technologies