 |  | | |
 | recommendations |
| |
   | Eastern Canada & Northeast U.S. |
|  |
  | FAR-NA |
| |
|
|  |
  | North and West Zone India |
| |
|
|  |
  | Northcentral U.S. |
| |
|
|  |
  | Northern Latin America |
| |
|
|  |
  | South Zone India |
| |
 | SZ INDIA-39 | Characterization of phosphorus in selected soil series of Karnataka and response of rice to applied phosphorus |  |
  | Southeast Asia |
| |
|
|  |
  | Southeast U.S. |
| |
   | Southern India & Sri Lanka |
|  |
  | Southern Latin America |
| |
|
|  |
  | Western Canada |
| |
|
|  |
  | Western U.S. |
| |
|
|  |
 | sandy soils |
| |
|
|  |
 | soil acidity and liming |
| |
|
|  |
 | soil testing |
| |
|
|  |
 | sorghum |
| |
|
|  |