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 | Queretaro |
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| Shaanxi |
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| Shanxi |
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| Sumatra |
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| TN |
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| WI |
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| | ARGENTINA-09 | Phosphorus and Potassium Fertilization Management in the Western Pampas | |
| | ARGENTINA-10 | Balanced Crop Fertilization under No-tillage Systems in Argentina | |
| | CHILE-01 | Site-specific nutrient management in southern Chile | |
| | GUATEMALA-05 | Phosphorus fertilization and soil phosphorus calibration studies in sugarcane soils of Guatemala | |
| | URUGUAY-01 | Survey of soil fertility and nutritional status of alfalfa of Uruguay | |
| | VIETNAM-08 | Balanced Fertilization for Better Crops in South Vietnam (BalcropS) | |
| 1999 |
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| 1997 |
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| 1995 |
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| 1993 |
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| 1991 |
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| 1989 |
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