Phosphorus in plants, HOW TO DO IT?@?!?!?

I have a plant that needs more phosphorus to produce its fruits, I don't have much money for fertilizer and like doing things myself, how can I get phosphorus into my plant? And how many grams are too much, the plant is smaller (not like corn big, like tomato-ish big). I planned on mashing up some Phosphorus rich foods and putting them in the soil, would that work?