The curve follows the pistachio schedule in the Portuguese CAP technical guidance for a density of 286 trees/ha — the closest to the 6 × 6 m spacing adopted, which gives 278: from 400 to 1,500 kg/ha in years 6 to 9, and a mature level of 1,800 kg/ha. From year 11 output alternates around that level, even years heavy and odd years light, so that the average across the twenty full-production years remains exactly the 1,800 kg/ha of the reference. Alternate bearing redistributes the crop; it does not shrink it.