| soil erosion | 8.10 | Fertile land is running out due to soil erosion. | ||
| soil moisture | 5.99 | Try to keep soil moisture even. | ||
| soil sample | 5.20 | Take soil samples. | ||
| soil condition | 4.02 | The soil conditions are similar. | ||
| soil type | 1.65 | The plant thrives in a wide range of soil types. | ||
| soil bacterium | 1.51 | Normally the common soil bacterium divides by binary fission. | ||
| soil test | 1.51 | A soil test would be beneficial. | ||
| soil fertility | 1.32 | The first is to maintain soil fertility. | ||
| soil surface | 1.18 | Plant so the top of the rhizome is level with the soil surface. | ||
| soil temperature | 1.18 | Students plotted soil temperatures on a graph throughout the school year. | ||
| soil mix | 1.12 | Start your catnip seed in a moist, sterile soil mix. | ||
| soil level | 1.05 | Plant with the neck above the soil level. | ||
| soil structure | 1.05 | Tilth, soil structure, is important. | ||
| soil conservation | 0.72 | This last point is one which is developed here in relation to soil conservation. | ||
| soil line | 0.72 | I saw the wire, about six inches above the soil line. | ||
| soil nutrient | 0.72 | Mulch, as it breaks down, also helps replenish soil nutrients. | ||
| soil analysis | 0.66 | Soil analysis and improvement. | ||
| soil degradation | 0.66 | Fertile lands in the highlands suffer from severe soil degradation, erosion and extensive deforestation. | ||
| soil quality | 0.66 | All farm products and soil quality are closely monitored for metal concentration. | ||
| soil acidity | 0.59 | Soil acidity can alter flower color. |