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The objective of this study was to monitor and compare the concentrations and loads of nutrients originated from three different irrigation systems used in a woody ornamental nursery to produce containerized magnolias. The study also monitored the concentrations and loads of nutrients from the reservoir used at the farm for both rainwater harvesting and irrigation water supply system at the farm. Concentrations of nutrients (NH4, NOx, TKN, Total P, and Total N) in the water collected monthly from the irrigation systems (overhead sprinkler, microirrigation, and ebb and flow) and the concentration of nutrients in the overflow from the recirculation reservoir were monitored for 12 months (March 2003 to February 2004). Monthly and annual loads of nutrients were calculated from the concentrations of each nutrient multiplied by the amount of runoff from each system and from the reservoir. The variability of concentration of NH4, NOx, TKN, total P and total N in water was most dependent on the time of fertilizer applications. The highest level of concentration for all 5 nutrients analyzed occurred in August 2003 when there was the second fertilizer application during the study period. In general, the reservoir had the lowest concentrations and loads of nutrients during the study period compared to overhead sprinkler and microirrigation systems and the ebb and flow.