1,721,008 research outputs found
Effetti di trattamenti fogliari con estratti dell'alga bruna Ascophyllum nodosum su viti soggette a limitazione idrica
No full textCanopy treatment impact of Ascophyllum nodosum extract on Sangiovese vines subjected to progressive water stress on gas-exchange parameters
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Evaluation of local minor cultivars and marginal areas to improve wines and increase the sustainability of the district ‘Colli Piacentini’
No full textIn several areas, global warming is endangering the sustainability of viticulture. Accelerated sugar accumulation and acidity loss are challenging growers and changing the styles of produced wines. The Italian wine district of ‘Colli Piacentini’ is dominated by local cultivars for the production of white sparkling wines, i.e. ‘Ortrugo’ and ‘Malvasia di Candia aromatica’. In 2017, two strategies were evaluated to counteract the effects of warming trends and, more specifically: i) the ripening dynamics of 20 minor yet autochthonous cultivars were compared with the patterns exhibited by ‘Ortrugo’, trying to understand if local biodiversity can be useful in a rapidly changing scenario; ii) basic chemistry of solutes accumulated in ‘Ortrugo’ and ‘Malvasia di Candia aromatica’ berries was characterized from veraison to harvest in five vineyards located between 165 and 380 m above the sea level (a.s.l.) trying to extrapolate the effect due to elevation. Among the minor cultivars, ‘Barbesino’, ‘Molinelli’ and ‘Bucalò’ were the most promising genotypes as ‘Barbesino’ maintained the highest levels of acidity throughout ripening (+2.8 g L-1 than ‘Ortrugo’ at harvest), whereas ‘Molinelli’ and ‘Bucalò’ had appreciable low ratios between sugars and acidity at harvest (-0.55 and -1.13 than ‘Ortrugo’, respectively). The ripening pattern of ‘Ortrugo’ and ‘Malvasia di Candia aromatica’ changed distinctively as a function of site elevation. At 380 m a.s.l. the evolution of ripening of both genotypes was substantially shifted by 7 and 10 days, respectively, in comparison with dynamics observed in vineyards located at 165 m a.s.l. Preliminary results point out that the reconsideration of local biodiversity and the colonization of formerly marginal hilly areas might be useful tools to maintain and/or increase the sustainability and the competitiveness of the wine district
Nocciolo, la micorizzazione combatte gli stress climatici
No full textEffetti della nuova micorriza arbuscolare Glomus iranicum su cv. Tonda Giffon
Post-budbreak pruning changes intra-spur phenology dynamics, vine productivity and berry ripening parameters in Vitis vinifera L. cv. ‘Pinot Noir’
No full textLate pruning is an emerging cultural technique aimed at deferring ripening kinetics and reducing the negative effects of warming trends on grape maturity. It relies on the inhibition of basal nodes and on the postponement of the progression of phenological stages. As a consequence, late pruning is capable of maintaining at harvest a moderate sugar concentration and an adequate acidity level in grapes. This work was intended to deepen the effects of late pruning, focusing on the intra-vine phenology variability and progression as well as on the interactions existing between the changes in vine balance and the ripening time shift. Two experiments were conducted over two consecutive years in different vineyards located in Abruzzo (central Italy), comparing late pruning (LP) applied when unpruned canes had shoots with two/three leaves already unfolded (phenological stage BBCH 12/13) with standard winter pruning executed at dormancy (WP). LP shifted phenology and led to a significant variability in the development stages detected on shoots arising from the different nodes of the spurs, whereas in WP vines shoots arising from count-nodes developed in synchrony. LP successfully delayed ripening, but the outputs of the two experiments were different: LP postponed sugars accumulation and the decrease of acidity in both experiments (-2° Brix and +2.5 g/L at harvest, as an average of the two experiments) though the yield was negatively affected only in the first experiment (-47% as compared to WP). Late spur-pruning confirmed its efficacy in spreading grapes maturity and maintaining higher acidity along with a reduced sugar concentration. The delaying effect seems to be quite independent from the seasonal vine balance given as leaf area-to-fruit ratio. The study provided further clarification of the physiological bases underlying vine response to delayed winter pruning and indicated robustness of its effects regardless environmental conditions and degree of vine balance
Contenimento della produttività e dell'alcolicità potenziale dei vini di sangiovese mediante posticipo della potatura invernale
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