The lack of oxygen in the bag (because of the waterlogging) caused the compost to go anaerobic. Anaerobic microorganisms produce by-products like ammonia or foul smelling hydrogen sulfide – sulfur can smell like rotten eggs. ... The compost will definitely help lighten your soil and add fertility.

Does bagged manure go bad?

A: Your bagged manure will be fine for many years. It'll slowly break down and possibly become less "potent." I'd just let it sit out in the air for a day or two before applying it in spring with plants around; otherwise, apply it at the end of any growing season.

How long does manure soil smell last?

"The smell usually goes away in a day or two. All it takes is a little bit of understanding from people who have moved next to a farm to be in the country."