zirkulierbar received special permission to use its fertilizer.the corn on the trial field is ready for harvesting -- earlier than expected, due to the drought. the soil mixed with the experimental fertilizer appears to have done a better job at supplying moisture to the corn than the untreated soil. zirkulierbar plans to focus next on using urine as a resource, which right now still has to be disposed of in the sewage system ariane: that would actually be the perfect combination, if we were able to bring all the nutrients we excrete together again in the form of agricultural fertilizer that's used to produce more food. this now has a good smell of soil. that means the composting has gone well. the material has turned back into soil. reporter: the team is working on improving and automating urine composting, in order to start processing larger amounts. ariane krause and florian augustin never lose sight of the big picture, to make their products so good and so clean that they'll be put to use on fields. and the festivals are providing more than en