Soil water balance: what the root reaches

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The standard

The measured water availability describes how much water the soil holds and how fast it releases it, instead of looking only at rainfall. What matters is what the root reaches, not what falls.

Criteria

Storage capacity and release count, not only the rain
Soil type and root depth set the access
The supply is viewed across the season
Extremes are buffered, not only recorded

Distinction

Water balance ≠ rainfall: rainfall falls on the surface, the water balance decides what of it stays for the vine. The measured water availability separates the supply from the actual provision.