This paper represents analysis of the impact of initial purity of naturalized alfalfa seed on the resulting amount of processed seed in the process of processing. In the processing of was determined amount of processed seed and waste. When processing alfalfa seed is very important that the difference between the amount of pure seed that laboratory assessment and the actual amount obtained seed at the facility for processing is lower. One of the big problems in the processing alfalfa seed is that it is being worked out seeds with a certain percentage of weeds which are difficult to separate during processing, especially quarantine weed dodder and curly dock. By law the processed alfalfa seed is not allowed to attend any grain dodder. Were processed three parties of natural alfalfa seed variety purity. Also, after each stage of treatment, were determined losses seed.U radu je obavljena analiza uticaja početne čistoće naturalnog semena lucerke na dobijenu količinu dorađenog semena pri procesu dorade. U procesu dorade semena određivana je količina dorađenog semena i otpada. Pri doradi semena lucerke veoma je važno da razlika između količine čistog semena koja se laboratorijski proceni i stvarne količine dobijenog semena u pogonu za doradu bude što manja. Jedan od velikih problema pri doradi semena lucerke je taj da se dorađuje seme sa određenim procentom korova koji se veoma teško odvajaju pri doradi, naročito karantinski korovi kao što su vilina kosica i štavelj. Po zakonu u dorađenom semenu lucerke nije dozvoljeno prisustvo ni jednog zrna viline kosice. Dorađivane su tri partija naturalnog semena lucerke različite čistoće. Posle svake etape procesa dorade određivani su gubici semena
