| Value | Category | Cases | |
|---|---|---|---|
| 0 | None | 4975 | 
                                    
                                    88.4%
                                 | 
| 1 | Organic manure | 518 | 
                                    
                                    9.2%
                                 | 
| 2 | Inorganic manure | 133 | 
                                    
                                    2.4%
                                 | 
| Sysmiss | 6177 |