Reproductive growth of grapevines in response to nitrogen supply and rootstock
- Autores: M. Carmo Vasconcelos, Markus Keller, Markus Kummer
- Localización: Australian journal of grape and wine research, ISSN 1322-7130, Vol. 7, Nº 1, 2001, págs. 12-18
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
- Dialnet Métricas: 1 Cita
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Resumen
Nitrogen fertiliser was applied at two rates (0 or 100 kg N/ha) to field-grown Müller-Thurgau grapevines grafted onto six rootstocks (Kober 5BB, Teleki 5C, Teleki 8B, Selection Oppenheim 4, Couderc 3309, Ruggeri 140). Half the nitrogen was applied four weeks pre-flowering and half at the end of flowering. Nitrogen supply reduced symptoms of inflorescence necrosis and improved fruit set, but increased bunch-stem necrosis, Botrytis cinerea bunch rot and yield. This was associated with reduced grape sugar, higher acidity and lower pH. Rootstocks had no significant effect on inflorescence necrosis, bunch-stem necrosis and bunch rot, but vines grafted on C-3309 and Ru-140 had both lowest yields and highest fruit quality. Nitrogen ¥ rootstock interactions were rare and contributed little to total variance, suggesting that rootstock-induced differences in scion performance were, except for SO4, largely independent of soil nitrogen level.
