1. Evaluation of a sampler for assessing ammonia losses from fertilized fields

   • R. R. Sherlock
   • J. R. Freney
   • K. C. Cameron

   OriginalPaper Pages: 61 - 66

2. Response of three sorghum varieties to N supply and plant density in a tropical environment

   • V. B. Ogunlela
   • P. N. Okoh

   OriginalPaper Pages: 67 - 74

3. Reactive rock phosphate fertilizers and soil testing for phosphorus: The effect of particle size of the rock phosphate

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

   OriginalPaper Pages: 75 - 93

4. Effect of algicides on urea fertilizer efficiency in transplanted rice

   • W. A. Muirhead
   • S. K. De Datta
   • R. M. Gusto

   OriginalPaper Pages: 95 - 107

5. Comparison of white clover and ammonium nitrate as nitrogen sources for tall fescue

   • C. E. Watson Jr.
   • V. H. Watson

   OriginalPaper Pages: 109 - 111

6. Risk and nitrogen use on rainfed rice: Bicol, Philippines

   • Joyotee Smith
   • Gloria Umali
   • A. M. Mandac

   OriginalPaper Pages: 113 - 123