Home soil test kits are crap. The reason that the Nitrogen reading is low is
because Nitrogen dosent occur naturally in the soil like Phosporus and
Potassium. It is water soluble, so any Nitrogen you put into the soil is
easily washed away with when it rains or when you water. To put it simply, the
easiest way to "increase nitrogen quickly" is to fertilize the plants.

toad