ISHS Acta Horticulturae 512: XXV International Horticultural Congress, Part 2: Mineral Nutrition and Grape and Wine Quality
NITROGEN EFFECTS ON YIELD AND CANOPY OF 'WHITE MUSCAT' GRAPEVINE |
| Authors: | G. Gay Eynard, A. Morando, C. Lovisolo, M. Bovio |
| Keywords: | Botrytis cinerea, Vitis vinifera, Canopy, Grapevine, Breeding and Biology Research Center, CNR, grapevine, Net Photosynthesis, Nitrogen Fertilization, White Muscat |
| Abstract:
Nitrogen was spread as ammonium sulphate in a single application each spring for 3 years at 4 N rates: 0, 40, 80 and 160 kg/ha. Weed development increased since the first application but chopping of cover crop was effective. In treated plots, in June of the third year the botanical composition was shifted from clover to grasses. Botrytis damaged more severely grapes fertilised with 160 kg/ha than with 0 or 40 since the first year of fertilisation. Differences in grapevine yield and vigour appeared small and not significant for two first years. In the third year canopy differences were evident at the highest N rates making a continuous wall, more open at the top, with larger and greener leaves than at 0 and 40 kg/ha. Net photosynthesis was lower at the lowest N rates than at 80 and 160 kg/ha according to changes in substomatal C dioxide concentration, without significant changes in stomatal conductance. | |
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