THIS STUDY WAS CONDUCTED TO DETERMINE THE EXTENT TO WHICH WORKERS WITH THE JOB TITLES OF GENERAL DIRECTORS, SALESMEN, SUPERVISORS, AND FIELD WORKERS IN LICENSED NURSERIES NEEDED AGRICULTURALLY ORIENTED KNOWLEDGE OF THE SAME KIND AND LEVEL AS WORKERS IN COMPARABLE JOB TITLES IN ORNAMENTAL HORTICULTURE BUSINESSES. DATA WERE COLLECTED BY PERSONAL INTERVIEWS FROM 160 EMPLOYEES OF 20 LICENSED NURSERIES AND 20 LICENSED ORNAMENTAL HORTICULTURE BUSINESSES SUFFICIENTLY LARGE TO EMPLOY ALL FOUR TYPES OF PERSONS IN A FOUR-COUNTY AREA OF NORTHEAST ILLINOIS. IT WAS CONCLUDED THAT SOME BASIC COURSES AND SOME SPECIALIZED COURSES ARE NEEDED FOR THE FOUR TYPES OF JOBS IN BOTH BUSINESSES. BASIC HORTICULTURE 1 AND 2, AGRICULTURAL CHEMICALS 1, AND SOILS 1 WERE RECOMMENDED FOR ALL WORKERS. FOR GENERAL DIRECTORS, SALESMEN, AND SUPERVISORS, HORTICULTURE 3, AGRICULTURAL CHEMICALS 2, FLORICULTURE 1, AND SOILS 2 WERE RECOMMENDED. FOR GENERAL DIRECTORS AND SALESMEN, HORTICULTURE 4, FLORICULTURE 2, AND SOILS 3 WOULD BE ADDED. COURSES IN HORTICULTURE, SOILS, AND FLORICULTURE AT DIFFERENT LEVELS OF SPECIALIZATION WERE RECOMMENDED FOR WORKERS ACCORDING TO POSITION AND FIELD. A BIBLIOGRAPHY, AN EXAMPLE FROM THE QUESTIONNAIRE, AND DATA ARE INCLUDED. THIS IS AN ABRIDGED VERSION OF AN ED.D. THESIS SUBMITTED TO THE UNIVERSITY OF ILLINOIS. THE COMPLETE STUDY IS AVAILABLE AS 65-7090 FOR $3.40 ON MICROFILM AND FOR $11.95 AS XEROXED COPY FROM UNIVERSITY MICROFILMS, INC., 300 NORTH ZEEB ROAD, ANN ARBOR, MICHIGAN 48106. (JM)