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`Barbados' New Guinea impatiens were grown in 500 cm 3  pots under drip irrigation and fertilized with solutions containing either 6, 12 or 18 mM N at two leaching fractions (0 and 30-50%). Soil moisture within the pots was characterized and controlled using electronic microtensiometers. The 0% leachate plants were automatically irrigated to container capacity when the soil tension in the pot reached 4.5 kPa, while the 30-50% leachate plants were irrigated for five minutes at a time whenever the soil tension was at or slightly greater than 4.5 kPa. After 6 weeks, there was only a slight effect of fertilizer concentration on height, width, or leaf number of the plants. Plants grown under 0% leachate did not differ significantly in overall growth and performance than those that were leached at every irrigation. Electrical conductivity of the potting media was highest in the 0% leachate treatments (highest readings in upper one-third of the pot) and increased as fertilizer concentration increased. After 6 weeks of production, total volume of irrigation solution leached per pot range6 from 2.2 to 3.6 liters for plants grown under the 30-50% leachate treatment.

502 PB 216 GROWTH OF NEW GUINEA IMPATIENS AT THREE FERTILIZER CONCENTRATIONS AND TWO IRRIGATION REGIMES USING SOLID-STATE MICROTENSIOMETERS