Table of Contents
Papers
| The role of research when implementing European environmental legislation at the national level | |
| J. Bouma | 267-275 |
| 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 |
| Sweet potato yields and nutrient dynamics after short-term fallows in the humid lowlands of Papua New Guinea | |
| A.E. Hartemink | 297-319 |
| 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 |
| 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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