WHEN AND WHY USE LUMA™-PHOS? LUMA™ PHOS is used during periods of cooler weather, because phosphorous decreases as temperatures decrease. LUMA™ PHOS is used after overseeding, laying new sod, because it will promote early season growth and rooting which helps during that critical transition period of dormancy break. LUMA™ PHOS is used on high pH soils above 7.2, uptake is restricted. It will also improve the density of the turf, which will help in the recovery from wear stress and greens up discolored foliage. LUMA™ PHOS micronutrients are chelated for efficient uptake and are highly soluble for immediate availability to the plant.