The application of nutrients in variable-dosages based on vigor maps or soil or plant samples is recommended.

It is recommended that in established vineyards the maximum amount of nitrogen be set at 5 kg N (per ha and year) per ton of grapes harvested.

IP growers should be encouraged to reduce the amount of nitrogen whenever possible to minimize leaching (e.g. by visual or instrumental observation of the green coloration of the leaves: a dark green colour of the leaves suggests in most cases that the nitrogen fertilization can be reduced).

The total amount of available nitrogen in organic fertilisers should be accounted for a period of 3 years.

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