1. The effect of controlled-release fertilizer ‘Osmocote’ on growth, yield and composition of onion plants

   • E. B. Amans
   • J. H. G. Slangen

   OriginalPaper Pages: 79 - 84

2. Ammonia volatilization from urea and ammoniacal fertilizers surface applied to winter wheat and grassland

   • S. G. Sommer
   • C. Jensen

   OriginalPaper Pages: 85 - 92

3. Crop nitrogen utilization and soil nitrate loss in a lettuce field

   • L. E. Jackson
   • L. J. Stivers
   • K. K. Tanji

   OriginalPaper Pages: 93 - 105

4. Response of ensete (Ensete ventricosum W.) to mineral fertilizers in southwest Ethiopia

   • Y. Uloro
   • K. Mengel

   OriginalPaper Pages: 107 - 113

5. Comparison of the P_i, Colwell, Bray 1, calcium acetate lactate (CAL) and Truog soil phosphorus test for predicting growth of oats, barley, triticale and clover in the field in lateritic soils fertilised with superphosphate and rock phosphate

   • Vijay Kumar
   • M. D. A. Bolland
   • R. J. Gilkes

   OriginalPaper Pages: 115 - 124

6. A comparison of five soil phosphorus tests for five crop species for soil previously fertilized with superphosphate and rock phosphate

   • M. D. A. Bolland
   • Vijay Kumar
   • R. J. Gilkes

   OriginalPaper Pages: 125 - 132

7. Identification of residual P compounds in fertilized soils using density fractionation, X-ray diffraction, scanning and transmission electron microscopy

   • Vijay Kumar
   • R. J. Gilkes
   • M. D. A. Bolland

   OriginalPaper Pages: 133 - 149

8. Chemical characterization and agronomic effectiveness of phosphorus applied as a polyphosphate-chitosan complex

   • E. Frossard
   • P. Tekely
   • J. L. Morel

   OriginalPaper Pages: 151 - 158

9. Nitrogen application and underground water contamination in some agricultural soils of South Western Nigeria

   • M. T. Adetunji

   OriginalPaper Pages: 159 - 163