| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | nitrogen | agricultural societies | Used as a fertilizer to improve soil quality and crop growth. | 1 |
| 2 | nitrogen | agricultural societies | Nitrogen is an essential element for soil fertility and is often replenished through crop rotation or nitrogen-fixing plants. | 1 |
| 3 | nitrogen | agricultural societies | Nitrogen is essential for soil fertility and is often added to agricultural fields as fertilizer. | 1 |
| 4 | nitrogen | agricultural societies | Nitrogen is an essential nutrient for crop growth and is often supplied through fertilizers in agricultural societies. | 1 |
| 5 | nitrogen | agricultural society | Important nutrient for plant growth and agricultural productivity | 1 |
| 6 | nitrogen dioxide | agricultural countries | Less concern for nitrogen dioxide as air pollutant compared to ammonia from fertilizers | 1 |