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Impatiens were grown in media containing either hydrated or carbonate dolomitic lime and subirrigated for 17 weeks with four irrigation water qualities (IWQ) and three water-soluble fertilizers (WSF). The WSF concentration was 14N–0.6P–5K mol·m –3  but contained either 50%, 25 %, or 3 % NH 4 -N. After 8 weeks, rootmedium pH ranged from 4.5 to 8.0. In general, the higher the percent NH 4 -N content of the WSF, the lower the root-medium pH, although there were significant interactions between IWQ and lime type with WSF on root-medium pH. With the same WSF, the concentration of NH 4 -N measured in the root media depended on root-medium pH. For example, with WSF containing 50% NH 4 -N, root-medium pH with the various IWQ ranged from 4.5 to 6.0, and media NH 4 -N ranged from 5.0 to 0.1 mol N/m 3 . Tissue N concentrations were higher with the higher NH 4 : NO 4  ratio WSF at all four sampling dates. The effect of IWQ on tissue N resulted from the root-medium pH effects produced by the various IWQ/WSF combinations. Shoot fresh and dry weights were unaffected by the NH 4 : NO 3  ratios in the WSF.

Effect of Water-soluble Fertilizer Nitrogen Form on Root-medium pH, NH4-N, and Impatiens Tissue Nitrogen