Research on precision agriculture (PA) has been conducted in Korea for about 10 years since 1999. Most of the research was focused on rice paddy fields that were flooded, flat, and small sized (e.g., 30 m x 100 m). Accomplishment during the period includes investigation on spatial variability in soil, crop growth, and yield properties, application of imported sensors and variable rate applicators, and development of Korean version of these sensors and variable rate applicators. PA technologies have been applied to single fields and effects on fertilizer reduction and yield increase were evaluated. Considering size of Korean rice fields, cost, and practicability, application and evaluation of PA concept for big-sized field or multiple fields would be necessary to promote adoption of PA by farmers. This paper reports results of PA adoption by a rice farming group in Pyeongtaek city, Korea. The site was about 50 ha, composed of 97 fields owned by 10 farmers. Main operation on this rice field complex was field-by-field nutrient management by fertilizer recommendation based on soil sampling and analysis before transplanting, and close-range reflectance of rice canopy during growing season. Variability of soil properties, rice growth, and yield and quality was investigated, and effects of nutrient management on rice yield and quality were evaluated. These results would provide guide to a better application and extension of PA technology to Korean rice fields.