 |  | | |
 | grid sampling |
| |
|
|  |
  | East Zone India |
| |
   | Eastern Canada & Northeast U.S. |
|  |
  | Great Plains U.S. |
| |
|
|  |
  | North and West Zone India |
| |
|
|  |
  | Northcentral U.S. |
| |
 | IA-13F | Effects of K Fertilization of Soybean Grain Yield and Disease Incidence |  |
| IL-19F | Nitrogen and Sulfur Fertilization of Wheat under Intensive Management |  |
 | IN-18F | Nutrient Management for High Yield Corn and Soybeans |  |
  | Northeast China |
| |
   | Northeast India & Bangladesh |
|  |
  | Northern Latin America |
| |
|
|  |
  | Southeast Asia |
| |
|
|  |
  | Southeast U.S. |
| |
   | Southern India & Sri Lanka |
|  |
  | Southwest China |
| |
|
|  |
  | Western U.S. |
| |
|
|  |
 | irrigation |
| |
|
|  |
 | magnesium |
| |
|
|  |
 | manure management |
| |
  | maximum economic yield (MEY) |
|  |