1. Response to nitrogen application and interval between harvests in five grasses — 2. Leaf development

   • D. Wilman
   • A. A. Mohamed

   OriginalPaper Pages: 3 - 20

2. Nitrogen fertilizer recommendations for arable crops as based on soil analysis

   • J. Ris
   • K. W. Smilde
   • G. Wijnen

   OriginalPaper Pages: 21 - 32

3. Fertilizer use and food production: World scene

   • D. J. Greenwood

   OriginalPaper Pages: 33 - 51

4. Environmental factors affecting nitrogen efficiency in flooded tropical rice

   • A. M. Fagi
   • S. K. De Datta

   OriginalPaper Pages: 53 - 67