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 | grid sampling |
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| East Zone India |
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| Eastern Canada & Northeast U.S. |
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| Great Plains U.S. |
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| North and West Zone India |
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| Northcentral U.S. |
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| Northeast India & Bangladesh |
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| COSTA RICA-07 | Evaluation of optimum potassium: calcium: magnesium ratio in banana yields | |
| COSTA RICA-08 | Evaluation of the nutrition dynamics and response of the new potato cultivars grown in volcanic soils in Costa Rica | |
| ECUADOR-05 | Banana yield response to high plant density and fertilizer rates | |
| MEXICO-43 | Impacto del manejo de la fertilidad del suelo en el rendimiento de maíz de grano de dos ciclos en el mediano plazo en el Sureste Mexicano. | |
| MEXICO-47 | Site-specific diagnosis of fertility and productivity of Queretaro Valley soils using global positioning (GPS) and geographic information (GIS) systems | |
| PERU-03 | Effect of Plant Density and Balanced Fertilzation on Corn Grain Yield | |
| VENEZUELA-05 | Study of Fertilizer-Plant Density Interaction on High Yield Corn | |
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| Southeast Asia |
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| Southeast U.S. |
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| Southern India & Sri Lanka |
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| Southwest China |
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| Western U.S. |
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| irrigation |
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