in-situ density

例句：

1. 1.The soil's in-situdensity affects the plant growth rate.
   土壤的原始密度影响植物的生长速度。
2. 2. The studyfound that the in-situ densityof the soil had a significant impact onthe plant growth.
   研究发现，土壤的原始密度对植物生长有显著影响。
3. 3. Thein-situ density of the soilis an important factor in determining its fertility.
   土壤的原始密度是决定其肥力的重要因素。