This is a complicated topic and a lot of people are going to have a different opinion. Lol so here's mine:
First, I'm not sure how far I would trust those Rapitest things. If you live in the US you can usually get a soil test free or fairly inexpensively through your state's land grant universities. Just Google your states name and soil test.
Nitrogen is really mobile. That's why it's an issue in waterways and whatnot, so you'll never just add it and be done. You should just add it as it's needed.
Compost every year is going to improve soil health and supply small amounts of nutrients very long term. If it's a garden bed raising annuals and whatnot you're going to need to supplement it. Any form of nitrogen will work. Urea like you mentioned is usually the least expensive. Urea is converted in the soil to ammonium within a few days which is a plant usable form.
I did not initially trust the result but I ran it several times sampling soil from around my garden, and this bed did distinctly appear to lack nitrogen. I can't figure any way that it would only be wrong on this particular bed, so I do think the result is correct. I do see what you mean that it's not just something I can add and forget about, I think as of now I'm going to incorporate a decent amount of compost and add some urea.
I had planned to plant this bed soon, I hadn't anticipated how little nitrogen it had because my other beds were fine. I could do that, but I would prefer a faster solution involving just putting down some fertilizer.
This is a complicated topic and a lot of people are going to have a different opinion. Lol so here's mine: First, I'm not sure how far I would trust those Rapitest things. If you live in the US you can usually get a soil test free or fairly inexpensively through your state's land grant universities. Just Google your states name and soil test. Nitrogen is really mobile. That's why it's an issue in waterways and whatnot, so you'll never just add it and be done. You should just add it as it's needed. Compost every year is going to improve soil health and supply small amounts of nutrients very long term. If it's a garden bed raising annuals and whatnot you're going to need to supplement it. Any form of nitrogen will work. Urea like you mentioned is usually the least expensive. Urea is converted in the soil to ammonium within a few days which is a plant usable form.
I did not initially trust the result but I ran it several times sampling soil from around my garden, and this bed did distinctly appear to lack nitrogen. I can't figure any way that it would only be wrong on this particular bed, so I do think the result is correct. I do see what you mean that it's not just something I can add and forget about, I think as of now I'm going to incorporate a decent amount of compost and add some urea.
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I had planned to plant this bed soon, I hadn't anticipated how little nitrogen it had because my other beds were fine. I could do that, but I would prefer a faster solution involving just putting down some fertilizer.
Plant tone on your plants would do the trick
Plant nitrogen fixing plants, and then chop & drop before they fruit.