Importance of Organic Matter in Soil – How It Builds Garden Fertility and Structure
Soil organic matter is the fraction of soil made from decaying plant residues, stable humus, and microbial biomass. It drives fertility by improving structure, water storage, nutrient exchange, and root habitat. Productive garden soils often test between 3% and 6% organic matter by weight. Sandy beds perform well near 2-4%. Clay-based beds respond better near…