Friendlyguy
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It depends on the type of P....i have heard phosphite is best P204 is next P205 needs to be broken down...outdoors i wouldnt think it matters get phosphoderma enzymes fungi keep up with it and you should be fine no need for mammoth P. Hydro, coco, or soiless i would add mam P. But i use soil and amendments along with my mycos and compost teas....i just gotta get my overwatering hand if the gd watering can...lmfao
Or you can just go buy a bottle of Mammoth P.
Phosphates are not easily available to the plants by their sticky nature. Hence why most bloom formulas have massive amounts of P.