1,720,993 research outputs found
Effetti della forma d'allevamento e dell'altitudine sulla crescita delle bacche del vitigno "Garganega" nella zona del Soave
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Evaluation of actual evapotranspiration of a Quercus ilex L. stand by the Bowen Ratio - Energy Budget method
No full textActual evapotranspiration from a closed-canopy Quercus ilex L. stand has been estimated by applying the Bowen Ratio-Energy Budget method. Daily water loss was 3.5 mm day–1, with a peak rate near 0.6 mm hour–1. The phenomenon of thermal inversion, quite common in mediterranean climates, seemed to play a significant role in reducing evapotranspiration, by promoting dew formation and delaying the establishment of fluxes of latent and sensible heat away from the canopy. Dew, which may form over many hours in the night, appears to be a major sink of available energy in the early morning and may represent a useful water source for stressed foliage. The alternating processes of condensation and evaporation may have a beneficial effect on the closed stand micro-environment
Espressione della stilbene sintetasi e contenuto di resveratrolo in uve della Valpolicella
No full textEspressione della stilbene sintetasi e contenuto di resveratrolo in uve della Valpolicell
Regolazione della compattezza del grappolo in Vitis vinifera L.
Full text linkGrappoli molto compatti comportano vari inconvenienti che in alcuni vitigni, Ie cui uve sono destinate all' appassimento, diventano molto rilevanti. Trattamenti chimici con acido gibberellico ed urea si ritengono efficaci per risolvere tale problema. Tali sostanze sono state provate sui vitigni Corvinone, Corvina e Rondinella in tre epoche (3-4, 6-8 e 10-12 foglie espanse) e a diverse concentrazioni (10, 20, 30 ppm) per GA e durante la fioritura con urea (0,75% e 1,5 %). I risultati sono apparsi dipendere dal vitigno: efficaci in Corvinone e inefficaci nei due altri vitigni
Rootstock effects on growth, dry weight partitioning and mineral nutrient concentration of grapevine
No full textStudies on water relations of grapevine (Vitis vinifera). Effects of sinks on leaf water potential and transpiration in non limiting conditions
No full textThe presence of sinks, both vegetative and reproductive, modifies the water relations of grapevines. The sinks enhance dehydration, induce a stable water potential at midday, and a slower rehydration. Transpiration rate is very little affected, but because of different leaf area water loss by transpiration is strongly dependent on the type and activity of sinks
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