The use of different soil nitrogen sources by young Norway spruce plants

@article{George1999TheUO,
  title={The use of different soil nitrogen sources by young Norway spruce plants},
  author={Eckhard George and Carmel B. Stober and Bettina Seith},
  journal={Trees},
  year={1999},
  volume={13},
  pages={199-205}
}
 Three-year-old Norway spruce trees were planted into a low-nitrogen mineral forest soil and supplied either with two different levels of mineral nitrogen (NH4NO3) or with a slow-release form of organic nitrogen (keratin). Supply of mineral nitrogen increased the concentrations of ammonium and nitrate in the soil solution and in CaCl2-extracts of the rhizosphere and bulk soil. In the soil solution, in all treatments nitrate concentrations were higher than ammonium concentrations, while in the… CONTINUE READING

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