Evaluation of horticultural information service in the horticultural area, among horticultural farmers using glass-houses. Characteristics of the business / modernization / succession by children / readership of professional magazines / activities in professional and occupational organizations / contacts with colleagues / need for more information / use of consultant services ( private, commercial versus state ) / general attitude to the information service assistants / how is information obtained about new methods in horticulture. Background variables: basic characteristics/ place of birth/ residence/ household characteristics/ occupation/employment/ education/ organizational membership