What soil moisture level supports healthy root growth without promoting disease?

• A. Very dry soil
• B. Moisture near field capacity
• C. Constant saturation
• D. Prolonged drought stress

Answer: (B)

Healthy root growth happens when there’s enough water for roots to take up without filling all the pore spaces. Moisture near field capacity provides that balance: there’s adequate water for uptake, but enough air in the soil for root respiration. When the soil is very dry, roots can’t access enough water, and growth slows. If the soil stays constantly saturated, oxygen is limited in the root zone, creating anaerobic conditions that promote root diseases. Prolonged drought stress also weakens roots and reduces vigor. So, moisture near field capacity offers the best environment for strong root growth and lower disease risk.