 | | Acknowledgements |
| | 1. Soil constraints on sustainable plant production in the tropics. |
| | 2. Impact of agricultural practices on soil pollution. |
| | 3. The use of organic biostimulants to help low input sustainable agriculture. |
| | 4. Nitrogen cycling in high-input versus reduced-input arable farming. |
| | 5. Green manure in rice farming. |
| | 6. Role of green manure in low-input farming in the humid tropics. |
| | 7. Green manuring with vetch on acid soil in the highland region of Rwanda. |
| | 8. Tropical lowland rice response to preceding crops, organic manures and nitrogen fertilizer. |
| | 9. Pearl millet and cowpea yields in sole and intercrop systems, and their after-effects on soil and crop productivity. |
| | 10. Influence of some characteristics of bean seed and seedlings on the tolerance to low phosphorus availability in the soil. (Infuencia de algunas caracteristicas de las semillas y plantulas de frijol Phaseolus vulgaris L. sobre la tolerancia a la baja disponibilidad de fósforo en el suelo ) |
| | 11. Evaluation of diverse effects of phosphate application on legumes of arid areas. |
| | 12. Effect of n and p fertilizers on sustainability of pigeonpea and sorghum systems in sole and intercropping. |
| | 13. Efficient fertilizer use in acid upland soils of the humid tropics. |
| | 14. Vesicular-arbuscular mycorrhiza management. |
| | 15. Impact of tropical va mycorrhizae on growth promotion of cajanus cajan as influenced by p sources and p levels. |
| | 16. Benefit and cost analysis and phosphorus efficiency of va mycorrhizal fungi colonizations with sorghum (sorghum bicolor) genotypes grown at varied phosphorus levels. |
