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Greenhouse cultural methods must minimize runoff to keep pace with environmental regulation aimed a protecting water resources. Two experiments were designed to investigate the effect of N fertilization rate on New Guin impatiens (Impatiens ×hawkeri) and peace lily (Spathiphyllum Schott) in an ebb-and-flow subirrigation system. Maximum growth response for impatiens was centered around 8 m M N levels as measured by root and shoot fresh and dry weigh height, leaf number, leaf area, and chlorophyll concentration. For peace lily, growth peaked at about 10 m M N. Growing medium was divided into three equal layers: top, middle, and bottom. Root distribution favored the middle and bottom layers, and the relative distribution of roots was consistent as N level increased. EC remained low in middle and botto layers at N concentrations below 10 mM, but increased significantly for all layers at levels above 10 m M. The EC for the top layer was 2 to 5 times higher than in the middle or bottom layers at all N levels. Increased nitrate concentratio paralleled increased EC, while pH decreased as N concentration increased for impatiens and peace lily. c. lless nc., ix 059 r pH ted ater n a 609

Nitrogen Nutrition of New Guinea Impatiens `Barbados' and Spathiphyllum `Petite' in a Subirrigation System