Nitrogen leaching in ecological agriculture : proceedings of an International Workshop, Royal Veterinary and Agricultural University, Copenhagen, Denmark /

Eitemau Tebyg

• Major biological issues resulting from anthropogenic disturbance of the nitrogen cycle : proceedings of the Third New Phytologist Symposium, University of Lancaster, Lancaster UK, September 1997 /
• Symposium on Nitrogen : held at Cunningham Laboratory, Brisbane, February, 1960.
  Cyhoeddwyd: (1960)
• Effects of agricultural production on nitrates in food and water with particular reference to isotope studies : proceedings and report of a panel of experts /
  Cyhoeddwyd: (1974)
• The soil nitrogen index and its calibration with crop performance to improve fertilizer efficiency on arable soils /
  gan: Robinson, J. B. D.
  Cyhoeddwyd: (1975)
• Simulation of nitrogen behaviour in soils /
  gan: Beek, J.
  Cyhoeddwyd: (1973)