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Look for phytotoxicity, particularly a problem with poultry manure, which is high in salts. Germinating cucumbers are very sensitive to salts, so a good way to check for phytotoxicity is to use some of the compost in a germinating media for cucumbers.
Evaluate the maturity of the compost. A carbon to nitrogen ratio of 10 to 15 indicates a stable compost. If concerned about maturity of compost, put it on early, at least two weeks in advance.
Evaluate for the presence of pathogens. To kill most pathogens, peak heating of 140 degrees to 160 degrees for a minimum of seven to ten days is needed.
Evaluate the nutrient content. Compost is a dilute source of fertilizer. The maturity of the compost will affect the amount and rate of nitrogen release. Uncomposted manure will release 50% of its nitrogen within the first year. Mature compose on the other hand will release about 10%.
Evaluate the heavy metal content. This can be high in sewage sludge.
Check for the presence of inert materials, such as wood chips, which are not a problem in themselves. But in a fine seed bed for small seeds, their larger size could cause a problem.
