1. Nitrogen loss from different tillage systems and the effect on cereal grain yield

   • P. E. Bacon
   • J. R. Freney

   OriginalPaper Pages: 59 - 66

2. Recovery of¹⁵N from ammonium nitrate and algal biomass-amended soil

   • K. R. Sistani
   • R. W. Taylor
   • K. R. Kelley

   OriginalPaper Pages: 67 - 73

3. Effect of rate and method of phosphate placement on productivity of durum wheat in mediterranean environments

   • A. E. Matar
   • S. C. Brown

   OriginalPaper Pages: 75 - 82

4. Effect of rate and method of phosphate placement on productivity of durum wheat in a Mediterranean climate

   • A. E. Matar
   • S. C. Brown

   OriginalPaper Pages: 83 - 88

5. The long-term residual value of rock phosphate and superphosphate fertilizers for various plant species under field conditions

   • M. D. A. Bolland
   • A. J. Weatherley
   • R. J. Gilkes

   OriginalPaper Pages: 89 - 100

6. Fluctuations in soil moisture, and plant uptake of surface applied phosphate

   • J. R. Simpson
   • A. Pinkerton

   OriginalPaper Pages: 101 - 108

7. Relative efficiency of ammonium polyphosphate and orthophosphates for wheat and their residual effects on succeeding cowpea fodder

   • M. V. Venugopalan
   • R. Prasad

   OriginalPaper Pages: 109 - 114

8. Solubility in system CO(NH₂)₂-NH₄NO₃-H₃PO₄-H₂O

   • Yong K. Kim
   • A. William Frazier
   • Cheryl L. Griffin

   OriginalPaper Pages: 115 - 121

9. Mercapto-pyridines and mercapto-pyrimidines as urease inhibitors

   • R. J. Radel
   • M. D. Crenshaw
   • H. M. Williams

   OriginalPaper Pages: 123 - 127