Vol 50, No 3/4 (2003)

Papers

• The role of research when implementing European environmental legislation at the national level

  J. Bouma

  267-275

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• Explaining yield gaps on farmer-identified degraded and non-degraded soils in a Sahelian irrigated rice scheme

  P.J.A. Van Asten, M.C.S. Wopereis, S. Haefele, M. Ould Isselmou, M.J. Kropff

  277-296

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• Sweet potato yields and nutrient dynamics after short-term fallows in the humid lowlands of Papua New Guinea

  A.E. Hartemink

  297-319

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• A comparison of the isotope-dilution and the difference method for estimating fertilizer nitrogen recovery fractions in crops. I. Plant uptake and loss of nitrogen

  K. Harmsen

  321-347

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• A comparison of the isotope-dilution and the difference method for estimating fertilizer nitrogen recovery fractions in crops. II. Mineralization and immobilization of nitrogen

  K. Harmsen

  349-381

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