1,721,053 research outputs found
Presentazione su "Nuove varietà di nocciolo per una moderna corilicoltura"
No full textDa anni stiamo sviluppando un programma di miglioramento genetico per incrocio che ha portato alla costituzione di sei nuove varietà particolarmente apprezzate perché di gran pregio: Tonda francescana, Volumnia 1, Volumnia 2, Volumnia 3, Volumnia 4 e Tonda etrusca. Abbiamo, così, cercato di soddisfare le esigenze dell’industria dolciaria e degli agricoltori creando varietà adatte a produrre in maniera costante, elevata e di qualità. Siamo impegnati anche nell’ottimizzazione dei processi e delle tecniche di propagazione per talea e innesto. Queste sono tutte premesse essenziali alla crescita del settore””
Relationships between Flower Density and Shoot Length in Hazelnut (Corylus avellana L.)
No full textHigh flower density is a prerequisite to obtain high yield. Considering that flower induction occurs simultaneously with shoot growth, shoot length could influence shoot flower abundance. Previous studies reported that nuts were borne in the apical part of the canopy on long shoots. But no data has been reported about possible relationship between flower density and shoot length. The aim of the present work was to assess whether flower density is related to shoot length in Corylus avellana L. Shoot morphological characteristics, flower number and flower sex was studied in two of the main cultivars of C. avellana. Female flowers were generally borne in apical long shoots. Shoot length was negatively correlated with flower density even though different behavior was observed between cultivars. Maximum estimated probabilities of shoot flowering varied between cultivars. These results suggest that flower density can be influenced by shoot length. Genotype can also affect such relationship. Flower density appeared to decrease in longest shoots in hazelnut. The effect of genotype on flower density may explain variation of productivity between cultivars
La potatura di allevamento e di produzione dell'olivo in Seminario "Minicurso sobre oliveira"
No full textseminario sulla potatura dell'oliv
Evaluation of canopy elasticity, light penetration and reciprocal shading for optimal canopy management in high density hedgerow olive orchards
No full textCanopy management is one of the most important factors influencing yield and economic life of high density hedgerow olive orchards. Currently, the canopy volume is set mainly on the basis of size of over-head harvesting machines; this is a limit for natural growth of trees which have to be pruned hard once the allotted canopy size is reached. Thus, in these sorts of orchards, growers have to find the optimal canopy management in order to control canopy growth and keep the canopy productive (high-yield efficiency). Three main factors have to be considered in canopy management: adaptation of canopy to over-head harvesting machines, light penetration and reciprocal shading. Over-head harvesting machines require elastic canopy in the part exceeding the projection of conveyor frames. Pruning operations have to be set in order to eliminate branches which are not elastic enough to bend down. Elasticity requirements were calculated in 'Arbequina' and 'Maurino' and branch sizes in relation to their branching position are discussed. Light penetration influences the light environment experienced by each shoot. Light environment influences flowering potential of bearing shoots. Effects of selective pruning and topping on light penetration in the canopy of 'Arbequina' and 'Maurino' are compared. Canopy size effect on shading of nearby row was then studied and compared between rows pruned by topping cuts and selective side pruning. In conclusion, tree canopy size can be increased but pruning should keep canopy elastic and enough porous in order to allow light penetration and flowering in the whole canopy volume. Increasing canopy size does not increase significantly reciprocal shading between rows but at the same time it may allow to keep fruit yield steady once tree canopy fills the allotted spac
Relationship among shoot productivity, light penetration in the canopy and tree light interception in super – high intensive orchards.
No full textPollenizer and Cultivar Influence Seed Number and Fruit Characteristics in Olea europaea L.
Full text linkThe effect of several pollination combinations of the olive cultivars Ascolana Tenera, Carolea, Leccino, and Picholine on seed quality and seed number and drupe and seed features were evaluated in 2007 and in 2008 in central Italy. The well-known pattern in olive fruit was confirmed by the high percentage of drupes (71.8%, on average) containing one seed with a closed endocarp, as the dispersal unit, optimizing the plant's investment in seedling survival. Based on the results of the x2 test of independence, there was a significant maternal and paternal effect on the number of normal seeds per drupe in some years and combinations. Particularly, in 2007, Picholine and Leccino cultivars (as mother) had drupes with two normal seeds (23.7% and 3.1%, respectively, with respect to 10.8% observed in a normal seed pattern), confirming that double-seeding in olive could be cultivar-dependent. Also the specific crosspollination between 'Carolea', as a pollenizer, and 'Ascolana Tenera' gave rise to a higher proportion of double-seeded drupes in 2007 (39% with respect to 14.3% expected to be in this category). In 2008, although 'Ascolana Tenera' produced more drupes with undeveloped seeds (31.9% with respect to 19.7% expected to be in that category), 'Leccino' and 'Carolea' had drupes with a lower number of undeveloped seed (14.2% and 11.5%, respectively). 'Maurino' and 'Ascolana Tenera' pollen produced significant effects on 'Leccino' drupes by increasing the number of drupes with undeveloped seeds in both experimental years. Double-seeded drupes outweighed those with only one normal seed in 'Leccino' and 'Picholine'. Instead, drupes with undeveloped seeds affected fruit weight, being generally lighter than those with normal seeds. Although the Leccino cultivar, combined with 'Maurino' and 'Ascolana Tenera', greatly increased the proportion of drupes without normal seed, such condition did not affect their final weight, which was not different from those with one normal seed, suggesting that this variety caused late seed death.Fil: Farinelli, Daniela. Università di Perugia; ItaliaFil: Pierantozzi, Pierluigi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; ArgentinaFil: Palese, Assunta Maria. Universita` Degli Studi Della Basilicata; Itali
Le varietà per il progresso della coltura del nocciolo
No full textNei diversi Paesi produttori di nocciole sono usate varietà selezionate in passato e rispondenti all'esigenze delle zone di coltivazione. Oggi l'industria dolciaria, che utilizza gran parte del prodotto, ha esigenze che sono di riferimento per migliorare la produzione con varietà più rispondenti. Per questo il miglioramento genetico si avvale del confronto varietale, utilizzando il patrimonio genetico mondiale, della selezione clonale e dell'incrocio. Fino ad ora non sono emerse grandi novità da sconvolgere l'assetto varietale esistente, anche per il sopraggiungere di preoccupanti malattie, ma molte nuove proposte sono in fase di elaborazione finale, soprattutto in quei Paesi dove sono in corso programmi consistenti. Le varietà possono migliorare la qualità e l'entità delle produzioni delle zone di coltivazione del nocciolo
Coltivazione intensiva e meccanizzazione della raccolta per una maggiore competitività produttiva.
No full textVarietà vegetale di Corylus avellana L. (Nocciolo) dal nome TONDA FRANCESCANA
No full textLa varietà è stata costituita a seguito di un programma di miglioramento genetico, per incrocio (Tonda di Giffoni x Tonda Gentile Romana) e successiva selezione dei semenzali, svolto presso le strutture del Dipartimento di Scienze Agrarie e Ambientali dell’Università degli Studi di Perugia
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