Originally Posted by White Gardens
If it's a synthetic source, then everyone wants to put a stop to it.
If you want results, just apply natural Urea, along with iron and call it a day.
Synthetic P source? All P fertilizers are made with phosphates mined from the ground. P ferts are the least "synthetic" of all the synthetic fertilizers.
BTW, urea is a synthetic fertilizer, made using the Haber-Bosch process.