1. Estimation of the contribution of biological N₂ fixation to twoPhaseolus vulgaris genotypes using simulation of plant nitrogen uptake from¹⁵N-labelled soil

   • Robert M. Boddey
   • Sabine H. Müller
   • Bruno J. R Alves

   OriginalPaper Pages: 169 - 185

2. Mussoorrie rock phosphate-pyrite mixture as phosphate fertilizer

   • S. N. Sharma
   • R. Prasad

   OriginalPaper Pages: 187 - 191

3. The effect of ionic strength on soil P reactions is negligible

   • P. R. Ernani

   OriginalPaper Pages: 193 - 197

4. European soils overfertilized with phosphorus: Part 1. Basic properties

   • E. Barberis
   • F. Ajmone Marsan
   • J. Torrent

   OriginalPaper Pages: 199 - 207

5. Effect of climate on the recovery in crop and soil of¹⁵N-labelled fertilizer applied to wheat

   • C. J. Pilbeam

   OriginalPaper Pages: 209 - 215

6. A modified urea based NP fertilizer: urea-TSP-MAP combinations

   • M. X. Fan
   • A. F. MacKenzie
   • H. D. Blenkhorn

   OriginalPaper Pages: 217 - 220

7. Estimating nutrient surplus and nutrient use efficiency from farm characteristics

   • J. W. A. Langeveld
   • G. B. Overbosch

   OriginalPaper Pages: 221 - 233