1. The influence of soil properties on the effectiveness of phenylphosphorodiamidate (PPD) in reducing ammonia volatilization from surface applied urea

   • Catherine J. Watson

   OriginalPaper Pages: 1 - 10

2. Effectiveness of the urease inhibitor NBPT (N-(n-butyl) thiophosphoric triamide) for improving the efficiency of urea for ryegrass production

   • Catherine J. Watson
   • R. J. Stevens
   • R. J Laughlin

   OriginalPaper Pages: 11 - 15

3. The maximum yield potential of subterranean clover swards achieved from superphosphate applications is influenced by the maturity and the plant density of the swards

   • M. D. A. Bolland

   OriginalPaper Pages: 17 - 31

4. Cultivation reduces fertilizer residual effectiveness and affects soil testing for available phosphorus

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

   OriginalPaper Pages: 33 - 46

5. Effects of mineral nitrogen andBradyrhizobium inoculation on growth and iron nutrition of groundnut

   • K. L. Sahrawat
   • V. Anjaiah
   • P. T. C. Nambiar

   OriginalPaper Pages: 47 - 52

6. Evaluation of problematic indigenous phosphate deposits for phosphoric acid manufacture

   • M. Anwar-ul-Haq
   • Ishtiaq Ahmad
   • Khalid Mahmood

   OriginalPaper Pages: 53 - 56

7. Free water in phosphogypsum

   • D. W. Averitt
   • J. E. Gliksman

   OriginalPaper Pages: 57 - 62

8. Optimising P₂O₅ availability for fertilizer use, by direct treatment of apatite with hydrochloric or nitric acids

   • K. Tennakone
   • U. S. Ketipearachchi
   • U. Weragama

   OriginalPaper Pages: 63 - 66