 |  | | |
 | grid sampling |
| |
|
|  |
  | East Zone India |
| |
   | Eastern Canada & Northeast U.S. |
|  |
  | Great Plains U.S. |
| |
|
|  |
  | North and West Zone India |
| |
|
|  |
  | Northcentral U.S. |
| |
|
|  |
  | Northeast India & Bangladesh |
| |
|
|  |
  | Northwest China |
| |
|
|  |
| PHILIPPINES-04 | Site-Specific Nutrient Management for Maize in The Philippines (Phil-Corn) |  |
 | VIETNAM-09 | Site-Specific Nutrient Management for Maize in Vietnam (Viet-Corn) |  |
| VIETNAM-10 | Nutrient imbalances in degraded soils of North Vietnam (Viet-DegSoil) |  |
|
|  |
  | Southeast U.S. |
| |
   | Southern India & Sri Lanka |
|  |
  | Southwest China |
| |
|
|  |
  | Western U.S. |
| |
|
|  |
 | irrigation |
| |
|
|  |
 | magnesium |
| |
|
|  |
 | manure management |
| |
  | maximum economic yield (MEY) |
|  |