Laboratory measurements and simulations of ammonia volatilization from urea applied to calcareous Chinese loess soils

@article{Roelcke1996LaboratoryMA,
  title={Laboratory measurements and simulations of ammonia volatilization from urea applied to calcareous Chinese loess soils},
  author={Marco Roelcke and Yingying Han and Shu Xiang Li and Joerg Richter},
  journal={Plant and Soil},
  year={1996},
  volume={181},
  pages={123-129}
}
Ammonia volatilization is the major pathway for mineral nitrogen loss in the calcareous soils of the Chinese loess plateau, with maximum losses reaching 50% of the fertilizer-N applied. A volatilization-diffusion experiment was carried out in the laboratory using a forced-draft system and soil columns of 15.5 cm depth. Urea was surface applied at rates of 210 kg N ha-1 to a soil with 10% CaCO3 and a pH of 7.7. The amount of ammonia volatilized as well as the concentration profiles of ammoniacal… CONTINUE READING

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