In high-sand rootzones, the higher the organic matter content the better.

In high-sand rootzones, the higher the organic matter content the better.

• A. True
• B. False
• C. Depends on rootzone
• D. Always better

Answer: (B)

In sand-based rootzones, drainage and air-space are vital. Organic matter can boost water retention and nutrient holding, but in a sandy mix those benefits come with a cost: adding too much organic matter fills pore spaces and reduces macroporosity, which slows drainage and keeps the surface wetter than is desirable. That wetter condition can stress roots, encourage thatch buildup as decomposition occurs, and complicate irrigation management. Because of this balance, there’s an optimum level of organic matter rather than a rule that more is always better. So the statement is false: higher organic matter content is not inherently better in high-sand rootzones.