1,721,094 research outputs found
Water relations and root growth of peach trees growing on rootstocks with differing growth potentials
No full textInfluence of flower bud phenology on dry matter partitioning to fruits in peach trees
No full textLa presentazione orale ha trattato gli effetti dell'asincronia della fioritura sulla ripartizione del carbonio tra i frutti di pesc
Differentes estrategias de riego en viña
No full textLa presentazione orale ha trattato gli effetti del deficit irriguo applicato in tre fasi fenologiche sulle caratteristiche quanti-qualitative della produzione dei vitigni Tempranillo, Cabernet Sauvignon e Tempranill
Differences in seasonal sensitivity to water stress between grapevine cultivars
No full textLa presentazione orale ha analizzato le differenze tra tre vitigni (Tempranillo, Cabernet Sauvignon e Chardonnay) nella risposta allo stress idrico applicato in diversi fasi fenologiche
Effect of post-harvest regulated deficit irrigation or partial rootzone drying on return bloom and flower-bud phenology of peach trees grafted on two rootstocks
No full textInfluenza di 5 portinnesti sul contenuto in sostanze ad attività antiossidante in 2 cultivar di pesco
No full textTree vigor, fruit yield and quality of nectarine trees grown under red photoselective anti-hail net in Southern Italy
No full textTree vigor, fruit yield and quality of nectarine trees grown under red photoselective anti-hail nets in Southern Italy
No full textIn Italy, hailstorms represent a major threat for fruit tree cultivation. Therefore many peach growers have protected their orchards with anti-hail nets. Many studies have demonstrated that photoselective shade nets can induce interesting photomorphogenic effects on several cultivated species. The aim of the present research was to study the effect of red photoselective anti-hail nets on nectarine tree vigor, fruit yield, and fruit quality. The study was carried out in a private orchard located in Eboli (Southern Italy) on mature nectarine trees 'Laura' grafted on GF677. On February 2008, five rows of trees were covered with a red photoselective anti-hail net (30% shade factor), whereas another five rows were covered with a white, transparent anti-hail net (10% shade factor) that is the most common type of anti-hail net used in the area. During the experiment a number of parameters related to tree vigor, fruit yield and quality were measured. Trees under the red net had higher light interception than trees under the white net and this suggests that the red net induced an increase in tree vigor, as previously reported for other species. Net color did not significantly affect the number of fruit per tree and fruit yield. Similarly, there were no significant differences in fruit size distribution or fresh fruit weight between trees under the two types of nets. Both cover and ground color of fruit skin was slightly, but significantly, less under red nets. On the other hand, fruit of trees under the red net tended to have significantly higher flesh firmness, lower soluble solids content and lower percent dry matter than fruit of trees under the white net. These effects may be related to a slight delay in fruit maturation induced by the red net or to a negative effect of this net on sugar accumulation in the fruit (potentially because of the higher shade factor of the red net compared to the white net)
Harvest index for mechanically handled peach fruits in post-harvest
No full textThe aim of this study was to define harvest indexes, based on peach skin ground color, suitable to allow mechanical grading and reach at the same time high fruit quality. Two cultivars, Springbelle and Douceur, were included in this research. In the first year of the study, harvest was performed in three pickings, fruit samples were graded with a mechanical sizer, and divided into seven categories based on their ground skin color, measured with a colorimeter. On the same fruit, soluble solids content, titratable acidity, and flesh firmness were measured. Moreover, the evaluation of damage eventually caused by grading and organoleptic tests were performed. These data were used to define harvest indexes based on the a* coordinate of skin ground color. The harvest indexes obtained during the first year were used as harvest index in the second year of the trial to test their suitability. The results showed that the method can be used successfully depending on the cultivar. Indeed, the model seems to work better on Springbelle, whereas skin ground color did not correlate with the qualitative characteristics and the ripening level of Douceur
Influence of branch autonomy on fruit growth and quality in nectarine trees
No full textDifferent studies have reported that peach tree branches are characterized by partial autonomy for carbon budget. Most of the studies have focused their attention on fruit growth, whereas no information is available about the effect of branch autonomy on fruit composition. The aim of this experiment was to study how branch autonomy affects fruit size and quality in nectarine trees. The trial was conducted in 2008, in Eboli (Italy), on ‘Rose Diamond’ nectarine trees grafted on GF677. The experiment compared four thinning treatments: a control treatment (C) including trees that were commercially fruit-thinned; a flower-bud thinning treatment (BT) applied homogeneously in all the canopy; a bud-thinning treatment where all the flower-buds of the top half of the canopy were removed, whereas in the bottom canopy layer thinning was applied at fruit stage as in the C treatment (Top-BT); the fourth treatment was similar to Top-BT, with the differences that the bottom layer was completely flower-bud thinned and the top commercially fruit thinned (Bottom-BT). Crop load in each canopy layer was very
similar between treatments. BT treatment induced significant increments in fruit fresh weight at harvest in both canopy layers and in soluble solids content (SSC) only in the bottom layer compared to the C. Interestingly, fruit size (in both canopy layers) and SSC (only in the bottom canopy layer) was higher in Bottom-BT and Top-BT trees compared to BT trees. The a* coordinate of the fruit skin cover color decreased slightly in thinned trees compared to control. Skin ground color and flesh firmness were very similar in Bottom-BT, Top-BT, and C trees. These results suggest that branch autonomy is only partial and carbon can move along relatively short pathways from canopy layers where demand for carbon is lower to layers where the demand is higher. These effects depended on the measured parameters and the canopy layer
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