Answer: When compost develops a bad smell it is usually because it has gotten out of balance, either because it is too wet and/or because there is too much nitrogen-rich or "green" material in the mix. The pile should be slightly damp like a wrung out sponge and there should be a mixture of fresh green material and drier brown material in it. The green would be fresh green grass clippings, for example. To stop the odor you will need to dry the pile out by adding more "brown" or high carbon material such as old fallen leaves, straw, wood shavings or whatever similar material is available. Mix this with the grass clippings and the odor should stop.
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