Soil quality is crucial for sustainable land management. Canadian studies have shown that losing soil organic matter and stability of soil aggregates are common in unsustainable land use. By focusing on the quality of soil organic matter, researchers have identified key fractions that impact soil functions like fertility and erosion. These fractions play a vital role in maintaining soil structure, water retention, and nutrient conservation. Inputs of organic matter and the process of soil aggregation are essential for keeping soil healthy and functioning properly.