do you know if watering down urine to get nitrogen wld have more harm then good becuase pee kills plants.
checkmark9 Reviewed by checkmark9 on . What's a subsitute for P? SInce human urine is a good source of N (nitrogen) and should be mixed 1 cup to a gallon of water. I was wondering, what is a good source of P (phosphorus) to feed the plant when in flowering stage? Something practical that I can find around the house? Thanks Rating: 5