1103 Paulsen (1103P)

Origin

This variety results from the cross of Vitis berlandieri cv. Rességuier number 2 and Vitis rupestris cv. Lot.

Breeder and year of release

Federico Paulsen, 1896.

Resistance to soil pests

1103 P is highly tolerant to root phylloxera. Its resistance to Meloidogyne incognita nematodes is moderate, and it is sensitive to Meloidogyne arenaria nematodes.

Adaptation to the environment

The 1103 P resists up to 30% “total” limestone, 17% “active” limestone, and a CPI (chlorosis power index) of 30. Its resistance to iron chlorosis is moderate. It adapts well to both drought conditions and wet soils. The 1103 P absorbs magnesium very well. Furthermore, it adapts well to acidic soils and has a fairly good tolerance to chlorides.

It is considered one of the most vigorous rootstocks in existence.

Interaction with the grape variety and production objectives

The 1103 Paulsen is a rootstock that confers high vigor to grafted varieties and promotes rapid vegetative development, especially during the first years of planting.

In general, it provides high yields, but in very fertile soils or with high water availability, it can cause excessive vigor, create imbalances between vegetative growth and production, and, under certain conditions, delay grape ripening. For this reason, it is important to adapt its management to the characteristics of the terrain and the production objectives.

This rootstock also shows a certain tendency to produce suckers from the
base.

Regarding compatibility with varieties, grafting with Syrah offers good
results. In contrast, some specific cases of affinity problems have been documented
with Tempranillo.