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Rotten dead matter in the soil is HUMUS
Rotten spots on home grown tomatoes can happen due to uneven watering. Another cause is soil that is not pH balanced.
It was a rotten way to end what had been a rotten day. The fruit was rotten. The word rotten can be used as an adjective or an adverb.
the adverb is rotten :D
Rotten is an adjective.