MARIA ERMELINDA A. DE FAMON Pengarang Micha S. Ratu Rihi, SP., M.Si Dosen Pembimbing 1 Dr. Ir. Suryawati, M.Si Dosen Pembimbing 2 Marsema M. Kaka Mone, SP., M.Sc Penguji 1 Naharuddin Sri, S. Pi., M.Si Penguji 2

The marketing costs and efficiency of onions in Kupang City are not yet known because of the differences chains and marketing functions. This study aims to: 1) identify marketing channels of onion 2) identify marketing functions of onion implemented by the institutionadministration; 3) calculate marketing margin of onion; and 4) determine the marketing efficiency of onion at the farmer level in the marketing channelof onion in Kupang City. Data was collected since 1 - 29 February 2020 through a survey method. The number of respondents are 63 people. The respondent determination of other marketing institutions is determined by the snowball sample method, namely by tracing information from retailers to farmers. The results show: there are three marketing channels of onion in Kupang City, namely: Channel I: Farmers → Retailers → Consumers; Channel II: Farmers → Brokers → Retailers → Consumers; Channel III: Farmers → Brokers → Collectors → Retailers → Consumers. The institution administration involved in the marketing functions consists of farmers, brokers, collectors, retailers and consumers. Marketing functions of onion in Kupang City are: the exchange function (selling) is conducted by all marketing institutions in all channels exceptconsumers. The exchange function (buying) is carried out byall marketing institutions in all channels exceptfarmers; physical function (transportation) is conducted by brokers on channels I and II, collectors on channel III, and retailers on all channelsexceptfarmersand consumers; physical function (weighing and sorting) is implemented by brokers on channels II and III; physical function (packaging) is conducted by all marketing institutions in all channels except farmers and consumers; and the facility function (weight loss/risk taking and financing/retribution) is conducted byall marketing institutions in all channels except farmers and consumers. Marketing margin of onion on channel I, II, and III respectively is Rp.10,981/kg; Rp.14,122/kg; and Rp.19,301/kg. The marketing of onion on channel I is efficient with the farmer's share of 51.39%, while on channels II and III are not efficient yet, with farmer's share of 45.12% and 37.56%. Key words: onion marketing, marketing margin, marketing efficiency