| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | irrigation | China | Historically developed advanced irrigation techniques | 1 |
| 2 | irrigation in agriculture | China | Incorporates traditional methods such as terracing and rice paddy irrigation | 1 |
| 3 | irrigation system | China | Ancient irrigation techniques were developed to support rice cultivation in flooded fields. | 1 |
| 4 | irrigation systems | China | Often incorporate traditional water conservation methods and have been part of agricultural practices for centuries | 1 |