compactness of soil

例句：

1. 1.The soil is very compactness, making it difficult for plants to grow.
   土壤非常密实，使得植物难以生长。
2. 2.The engineer used a compactness to pack the soil before planting.
   工程师使用一种密实剂来在种植前填充土壤。
3. 3.The compactness of the soil affects the growth of plants.
   土壤的密实程度影响植物的生长。