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Explanation: I think it is a play of words here as "verregnen" can also mean "to spoil by raining". As Cilian has indicated the yeast industry waste causes disturbing to the agricultural process.(Raining in the sense of being exposed to yeast industry waste not rain.) Without any context it is hard to say, but I would add an extra explanation: The yeast industry waste causes disturbance to the agricultural process by ..... (and then adding information taken from the context)