NITROGEN FERTILIZATION ON SEEDLESS GRAPES AT THE SÃO FRANCISCO RIVER VALLEY

Aiming at determining the level of nitrogen applied through fertirrigation, appropriate for good grape plant development, better fruit quality and higher yield, an experiment was carried out in Petrolina-PE, located in the semi-arid region of the Brazilian Northeast.
In a randomized blocks experimental design with split-plots were studied five seedless table grape cultivars (‘Perlette’, ‘Thompson Seedless’, ‘Marroo Seedless’, ‘Catalunha’ and ‘Superior Seedless’) and four nitrogen levels (0, 75, 150 and 300 kg ha^-1 N). Application of fertilizers was done by microsprinkler.
Treatments were evaluated during two harvest seasons in 2001, one in the first and the other in the second semester.
The variety ‘Marroo Seedless’ presented the highest yield in both yield cycles. ‘Perlette’ and ‘Superior Seedless’ also had high production at the first and second cycle, respectively.
The N level of 75 kg ha^-1 promoted the highest yields for ‘Marroo Seedless’, ‘Perlette’ and ‘Superior Seedless’ being respectively 26.4, 12.5 and 10.6 t ha^-1. The number of bunches per plant showed a direct relationship with N levels applied and yield.
There was no significant effect of N levels on the other bunch characteristics evaluated.

III International Symposium on Tropical and Subtropical Fruits

D.J. Silva, P.C. de Souza Leão, E.E.G. da Silva

Vitis vinifera, nitrogen content, mineral nutrition, fertirrigation, fruit quality

https://doi.org/10.17660/ActaHortic.2010.864.24