EFFECT OF FERTILIZING ON GRAPEVINE FRUIT MATURITY IN NORTHERN CONDITIONS

E. Vool, R. Rätsep, K. Karp
The aim of the present experiment was to evaluate the influence of foliar treatments (PK fertilizer and glycinebetaine) on interspecific hybrid grape cultivars ‘Hasanski Sladki’ (HS) and ‘Rondo’ (R) maturity parameters in northern conditions. The plantation was established in 2007 and, in 2009, the experiment with foliar treatments: PK fertilizer, glycinebetaine, and glycinebetaine plus PK fertilizer was carried out.
The grape soluble solids content ranged from 13.7 to 21.5°Brix, foliar treatment had no influence and results variation was caused by cultivar properties. All foliar treatments increased soluble solids and titratable acids ration on R. The berries pH was lower on HS in all fertilizing treatments. Maturity index (soluble solids × pH2) depended barely on cultivar and ranged from 116 to 135 in R and from 203 to 209 in HS. Total anthocyanins content was higher in R fruits and the content increased with PK-fertilizing. The study showed that foliar treatment had no influence on grape maturity and the latter was more affected by cultivar properties. Based on the study, cultivar HS is more suitable for wine production in northern conditions, whereas, R needs to be further investigated.
Vool, E., Rätsep, R. and Karp, K. 2014. EFFECT OF FERTILIZING ON GRAPEVINE FRUIT MATURITY IN NORTHERN CONDITIONS. Acta Hort. (ISHS) 1017:231-236
https://doi.org/10.17660/ActaHortic.2014.1017.29
soluble solids, titratable acids, sugars and acids ration, pH, anthocyanins
English

Acta Horticulturae