However, depending on the context, it could also be translated as:
* Soil aeration: This is a more technical term used in agriculture and gardening.
* Soil cultivation: This refers to the process of preparing the soil for planting, which includes loosening it.
* Soil amendment: This refers to improving the soil's structure and fertility, which can include loosening it.
So, the best English translation would depend on the specific context in which "pambuhaghag ng lupa" is used.