In a container, some people don't use compost at all. I use about 10-15% and the rest potting mix and other light stuff.
In a garden bed, I think the general rule is 1-2 inches of compost a year. If it's a new 4' x 8' bed then 2 bags of compost. A new 4' x 16' bed 4 bags of compost.
Also some crops prefer richer soil than others. Melons like really rich soil. Maybe as much as 50% compost.
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