Effetti dell'acido gibberellico su alcune modificazioni istologiche dell'epicarpo dei frutti di « Washington navel», « Tarocco», e Clementine « Comune »

Some experiences on « Tarocco» and « Washington Navel » sweet oranges and clementine mandarin concerning the effects of gibberellic acid on fruit rind senescence are here reported. The following treatments were compared: I - one treatment at start of fruit colouring; 2 - one treatment about 40 days later; 3 - one treatment about 80 days later; 4 - two treatment; at start of fruit colouring and 40 days later; 5 - two treatments: at start of fruit colouring and 80 days later; 6 - control. All the treatments were made with 1O p.p.m. of gibberellic acido Rind samples were made from fruits collected at two different period of harvest season: as untreated fruits were ripen and two months later. Histological observations were made on cell size of flavedo and middle albedo and intercellular spaces percentage of inner albedo were evaluted. Results showed no effect of gibberellic acid on clementine mandarin, probably because of typical rind structure of this species, in wich no compact tissues can be observed once during first ripening phases. In «Tarocco» and « Washington Navel» on the contrary, gibberellic acid proved to be effective in reducing rind senescence; infact rind tissues of treated fruits appeared more compact, with smaller celles, and minor intercellular spaces in inner albedo, also in fruits collected two months later. More effective treatments resulted those made at the start of fruit colouring

Forty-four years of land use changes in a Sardinian cork oak agro-silvopastoral system: a qualitative analysis

The island of Sardinia is the biggest producer of natural cork in Italy. In this study, cork oak cover change is investigated in a typical agro-silvopastoral system where the main activities are cereal fodder and wheat cultivation, sheep rearing and cork exploitation. The research method is based on the comparison of two land use maps produced by photo-interpretation of digitised aerial photographs taken in 1954 and 1998, combined with interviews with local farmers, field surveys, and data collected from literature, administrative documentation and decadal censuses (at council level). The results show that the cork oak woodland surface decreased (-29%). It was substituted by other forest, ploughed land, and mixed grassland and shrubland. Apart from the transformation of the cork oak woodland to other forest, other changes have happened probably because of an increase in agricultural and pastoral activities as described by the documental material available for the same area

L'Agricoltura

L'attività agricola ha rivestito da sempre una grande importanza nell'economia della provincia di Sassari. Anche il settore industriale e commerciale è rimasto a lungo legato - soprattutto prima della nascita del polo industriale di Porto Torres - al comparto agricolo, di cui ha trasformato e distribuito i prodotti non finalizzati all'autoconsumo familiare: tra questi hanno assunto un ruolo di rilievo il formaggio, il grano, il carciofo, l'olio, il vino, il sughero e la frutticoltura, che sono esaminati in questo capitolo

Dinamiche e realtà dello sviluppo agrario nel territorio di Alghero

L'analisi di quest'ultimo trentennio sottolinea il cospicuo apporto dato dal comparto agricolo alla complessiva economia del comune, e sottolinea come un equilibrato sviluppo socio-economico non possa prescindere dall'agricoltura. Viene esaminata la peculiarità del territorio algherese, dove il settore agricolo si è evoluto con una dinamica piuttosto differente da quella provinciale per la presenza di un'agricoltura intensiva, caratterizzata dal prevalere delle coltivazioni e del bovino da latte sul tradizionale allevamento ovino

Dall'esperienza corsa utili suggerimenti per la diffusione dell'avocado (<i>P. americana</i> mill.) in Sardegna

Avocado's diffusion in Southern Sardinia can profit of scientific data from near Corsica island obtained by the «San Giuliano, Station de Recherques Agronomiques I.N.R.A.» during a period of twenty years. The research suggests Mexican cultivars («Zutano»), Mexican x Guatemaltec hybrids («Bacon», «Fuca», «Fuerte », «Nowles» and «Regina») and Guatemaltec («Hass» and «Nabal») cultivars. The last two in warmest microclimates. Moreover there are fiorai biology and technical informations. This study confirms real possibilities to spread avocado's cultivation in Southern Sardinia with water resources

Comune di Bonnanaro: interessante cultivar sarda di ciliegio

Among population of sweet cherry trees grown in North-Western Sardinia, the cv &lt;&lt;Comune di Bonnanaro&gt;&gt;, so called because it is spread in the most importance area of cherry cultivation, has a particular importance. This rustic variety is characterized by medium vigorous trees, the blossoming occurs in the third decade of March and the commercia harvest-time at the end of May. The fruit is small, tender and deep red and with colourless juice at the ripeness. Its acidulous taste is very pleasant. Sapidity of the drupe and hardness of the trees, however, join up with small size and low flesh/stone ratio of fruits

Effetti della somministrazlone di un prodotto a base di amminoacidi su alcune cultivar di vite

L'articolo presenta la ricerca, con conseguenti conclusioni, effettuate su cultivar di vite del patrimonio varietale sardo. Da tale studio si fa rilevare come la somministrazione di alcuni idonei amminoacidi pare costituire una promettente tecnica d'intervento per la vite

Analisi multitemporale del consumo degli oliveti periurbani nel nordovest della Sardegna: il caso di studio della città di Sassari

In Sardinia the presence of olive stands plays an important role in economic business and landscape planning. In particularly, since the 16th century, the Miocene calcareous plateau of North- West is covered by an olive stand system mainly for olive oil production. These olive groves actually are composed by a local variety (Bosana) of which the oil is rich in antioxidant and flavour compounds and for this reason appreciated by the consumer. In the same region is located the city of Sassari, the second biggest city of Sardinia, which territory contains 50% of the whole olive stands of North Sardinia, most of them are concentrated in a “ring” around the city. The survey was conducted with historical and spatial explicit data of land-use and land-use change from the half of 19th century to the present (2007), to test the hypothesis that during the 20th century the area of olive stands decreased against urban expansion. In fact, changes in land-use (in particular those regarding agriculture lands) are a widespread phenomenon in Mediterranean regions and particularly intensive along urban borders. Historical land use data were derived from a variety of sources including cadastral data, maps and aerial photographs. A GIS was necessary to store, manipulate and analyse the digital information and to carry out land use change analysis. The historical analysis started by analysing the cadastral data of 1860, 1920 and 2007. The first one shows a higher density of olive groves in the ring around the city than the present. They were associated with vineyards, pasture and ploughed land. From 1860 to 1920 the olive stands increased due to destruction of the vineyards affected by Grape phylloxera. The information regarding the period between 1920 and 1977 and from 1977 to 2007 is given by aerial photographs that allow determine high resolution details in a spatial complex landscape. From 1960’s the city of Sassari had had the major expansion characterized also by an uncontrolled diffusive urbanization (sprawl) for the leak of a specific legislation. Between 1920 and 1977 the urban development caused the decline of the olive stands due cover density reduction or land use change, with the final result of disappearance of almost 100,000 olive trees in fifty years. The decline operates along the internal limit of the ring caused by urban expansion, and in several locations within the ring due the realization of small villages and the transformation of the olive grove in a garden. The former pattern is the principal factor of the olive landscape fragmentation. Despite the decline, in the external limit of the ring was verified the increase of olive groves but with lower magnitude than the decrease. Similar trends were evaluated for the period 1977-2007 using cadastral data, and digital land use maps. The main causes of olive stand decrease can be summarized in the request of lands for the realization of new industrial and 12 residential areas; in the people movement from the city to the rural area motivated by the better life condition; in the absence of a specific legislation for landscape protection and regulation. Finally the research gives some guideline for management and recovery of the olive groves in Sardinia which rule in Mediterranean ecosystems is recognized in a wide range of studies

Ricerche su alcuni sistemi di allevamento del vitigno "Vernaccia": nota 1.: osservazioni sulla colatura

A 3 year research has been conducted on grapevine « Vernaccia » variety to evaluate the influence of some training systems on the flower failure percentage. Four training systems were compared: spur pruning, horizontal cordon, bilatera1 Guyot, and Sylvoz. Observations were made each year on the flower number per inflorescence, and on the flower failure percentage. The resu1ts showed a great influence of the training system on the flower failure percentage, while the number of flowers per inflorescence was mainly related to the different seasons. The highest flower failure percentage was found in spur pruned trees, the lowest in Sylvoz trained trees, and the intermediate in horinzontal cordon and bilateral Guyot trained trees

Influenza dell'intervento irriguo sul ciclo produttivo dell' olivo: nota 3.: effetti del turno d'irrigazione sull'attività vegetativa e produttiva della cv «Ascolana tenera»

An irrigation trial was carried out during three years on «Ascolana tenera» olive tree variety. The following treatments were compared: A - irrigation at weekly intervals; B - irrigation at biweekly intervals; C - irrigation at triweekly intervals; D - irrigations at montly intervals; E - irrigation at intervals of five weeks. Observation on vegetative growth and on some aspects of floral biology were made. Fruit characteristics like volume, weight, thickness, lengh and width were also determined. Furthermore, mesocarp and stone thickness and the ratio mesocarpfstone were recorded. A distinct variability of the resu1ts regarding the growth and the productive behaviour of the trees was observed, though the different irrigation intervals did not always effect them. In the other hand, frequent irrigation intervals affected sto ne thickness and the ratio mesocarpfstone in a positive way