Here's something I just posted for someone else about release rates for compost and manure (releasing nutrients in to soil):
Nutrient Release Rates from Compost and Manure
Gardeners need to understand that the nutrient release from compost and manure is slow, taking years. Adding compost or manure to improve soil tilth is not the same as fertilizing.
The typical nitrogen release rates from manure is only 30 to 50% the first year (fresh manure), 15 to 25% the second year, 7 to 12% the third year, 3 to 6% the fourth year, and so on. With compost and composted manure, the release rate is even slower, 5 to 25% the first year, 3 to 12% the second year and 1 to 6% the third year.
Since the nitrogen percentage of compost and manure products is typically only 2 to 4%, the amount of actual nitrogen release to support crop growth is very small.
##For soil with 4 to 5% organic matter, the mineralization (release) of nitrogen from soil organic matter will likely be sufficient for crop growth.
##For soils with 2 to 3% organic matter, the mineralization of nitrogen from soil organic matter will not likely be sufficient for heavy feeding vegetable crops. Supplement with 0.1 pound nitrogen fertilizer per 100 square feet.
##For the typical garden soil with 1% organic matter or less, the mineralization of nitrogen for soil organic matter will be minimal. Add 0.2 pounds of nitrogen fertilizer per 100 square feet.
https://www.ext.colostate.edu/mg/Gardennotes/711.html
Over time (years) as you keep adding compost and organic material to your soil, you will have lovely soft black enriched soil with lots of earthworms, that things will grow beautifully in. In the meantime while you keep adding more organics every couple months to work towards that long term goal, you need to be supporting the plants you have with some kind of quick release nutrients.