 |
| |||
| contour ditch irrigation; contour-furrow method; cross-contour-furrow irrigation | |||
| contour-grade ditches irrigation | |||
| irrigation par rigoles suivant les courbes de niveau: 8 phrases in 2 subjects |
| Agriculture | 6 |
| Water resources | 2 |
|
| |||
| contour ditch irrigation; contour-furrow method; cross-contour-furrow irrigation | |||
| contour-grade ditches irrigation | |||
| irrigation par rigoles suivant les courbes de niveau: 8 phrases in 2 subjects |
| Agriculture | 6 |
| Water resources | 2 |