a possibility or just an illusion. not for a laboratory in you. marcus bona searches for traces which the two types of farming leave an animal for the vegetables and grain one crucial difference is the use of fertilizer organic farming opts for organic plant remains in conventional farming the mineral fertilizer. mineral fertilizer consists of nitrogen which plants need but mineral fertilizer has a totally different isotopes signature from bio for analyzer for instance we can determine this with our measuring techniques and thus ascertain the origin of organic or conventional farming ultimately this bio product also goes into fodder so an egg from a hen that has been eco reared and given bio fodder must also reveal this nitrogen