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The influence of nitrification on the medium solution and growth of holly ilex azalea rhododendron and juniper juniperus in a pine bark medium



The influence of nitrification on the medium solution and growth of holly ilex azalea rhododendron and juniper juniperus in a pine bark medium



Journal of the American Society for Horticultural Science 111(5): 708-712



Three genera of woody plants were container-grown in a pine bark medium. Pine bark was amended or unamended with nitrapyrin (NI) and fertilized with an NH4-N fertilizer. Medium solution NH4-N concentrations of bark without NI decreased rapidly for the first 3 to 5 weeks with a concomitant increase in NO3-N concentrations. Medium solution of pH at 0 NI decreased 0.8 unit during periods of rapid NO3-N accumulation. The low medium solution pH of the 0 NI treatment resulted in solution Ca, Mg, and Mn concentrations that were several times greater than at 83 .mu.g of NI. Correspondingly, tissue concentrations of these ions were generally greater at the 0 NI treatment than at the 82 .mu.g NI treatment. In general, there were no differences in shoot dry weight in response to NI treatment. Results indicate that nitrification is important in the nutrition of container-grown plants.

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Accession: 006698960

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