Agrinomy
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Oxygen Demand vs Temperature

Chemistry & Root Zone

Core concept

Root respiration is temperature-dependent. As temperature rises, roots consume oxygen faster.

This means oxygen stress can occur even when air-filled porosity appears adequate.

Temperature effects

  • Respiration roughly doubles for every 10°C increase
  • Oxygen solubility in water decreases as temperature rises
  • Warm, wet root zones are the highest risk combination

Practical implications

  • Summer irrigation carries higher oxygen risk
  • Warm substrates require higher AFP
  • High EC compounds oxygen stress
  • Root pathogens thrive under low-oxygen, warm conditions

Agronomic note

Many “summer nutrient problems” are actually oxygen demand problems, not feed rate issues.

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