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Uniform  Rhododendron  `Roseum Elegans' plants were potted into 3-gal plastic containers and place atop eight identical 1-m 3  soil-filled boxes (six per box). The bottomless boxes were recessed into a grassed field and filled with Woodbridge fine sandy loam. Soil samples were taken in 30-cm layers to 90 cm from each box and analyzed for NO 3 -N. Samples were taken at 14-day intervals from 9 June 1994 to 10 Nov. 1994. All plants received 40 g of Sierrablen 17N–6P–10K 8–9 month controlled-release fertilizer as a topdressing on 13 June 1994. Half of the boxes received a high irrigation rate of 5 gal/min for 4 min and half received a low rate of 5 gal/min for 1 min. Irrigation was provided every other day from above the plant canopy to simulate typical irrigation practices. For the low irrigation treatment, NO 3 -N levels reached 19.5 mg of NO 3 -N/kg of soil in the first 28 days of the study, while increases in the deeper layers lagged behind. For the high treatment, NO 3 -N levels followed a similar pattern, but only reached 8.9 mg of NO 3 -N/kg of soil in the same time period. These results suggest that the high irrigation volumes cause NO 3 -N to leach at a faster rate, posing a threat to water resources.

Nitrate-Nitrogen Concentrations in the Soil Profiles Beneath Containerized Rhododendron Provided High or Low Irrigation Volumes