Compost is done. Now what?
As I've mentioned in the past my compost bin is quite effective at breaking down everything we throw into it and so my wife and I don't bother maintaining an ideal ratio of browns to greens. We've been composting in it and container gardening behind our apartment for just over three years. The first summer we didn't use the compost. The second year we just used compost straight out of the bin (worked quite well actually) and last year we sifted out the compost to get a finer soil that we added to an organic potting mix. Because my wife has been unsatisfied with the way our tomatoes have turned out last August I tried something new. I sifted out 18 gallons of finished compost, put it in a Rubbermaid plastic tub, and let it sit on the back porch undisturbed until yesterday. I figured this way we could let any stray bits of stuff finish decomposing before it came in contact with our plants. Yesterday I used a commercial soil test kit (LusterLeaf Rapitest kit) to check the pH and the NPK levels of this finished compost. According to the parts per million equivalency sheet our compost has 5 to 10 ppm phosphorous, about 400 pm potassium, and 640 ppm nitrogen. The nitrogen test was so magenta that we had to dilute it, seven parts water to one part testing solution, just to get to a color that appeared on the provided chart. So it appears that we've made an organic nitrogen fertilizer. My question is - what can I do with it? We don't use enough soil in our containers to use up all 18 gallons of this stuff at a 1 to 7 ratio. Does anyone have recommendations on nitrogen-loving plants that I can grow in containers on a concrete patio?