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Glossary:Available water capacity

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Also known as - Available moisture capacity

The capacity of soils to hold water available for use by most plants. It is commonly defined as the difference between the amount of soil-pore water at field moisture capacity and the amount at wilting point. It is commonly ex pressed as inches of water per inch of soil. The capacity (in inches) in a 60-inch profile or to a limiting layer is expressed as:

  • Very low - 0 to 3 inches
  • Low - 3 to 6 inches
  • Moderate - 6 to 9 inches
  • High - 9 to 12 inches
  • Very high - more than 12 inches