Search results for "vit.C"
showing 7 items of 297 documents
Energia pulita dagli scarti della produzione vitivinicola
2009
Regional Farmers’ Perception and Societal Issues in Vineyards Affected by High Erosion Rates
2021
We explore the current situation in a viticultural region in Eastern Spain from a holistic and multifaceted research approach, which allowed us to understand the biophysical conditions, economic cost, social impact, and perception of the farmers’ community to the use of catch crops. A survey of the perception of the farmers, and an assessment of the biophysical impact of catch crops (CC) and tillage (C = Control plot) on soil organic matter, bulk density, infiltration capacity (single ring infiltrometer), and runoff generation and soil erosion (rainfall simulation experiments) was carried out. Two representative fields as study sites were selected in Les Alcusses valley, within Els Alforins…
Du territoire géographique au territoire économique : la situation de la viticulture
2011
Through time and space, the construction of the wine territories reveals them as subjects of economic issues. The analysis of these economic issues mobilizes traditional concepts (theory of comparative advantages) and more moderns (new economic geography). Thus, we progress gradually from the geographical territory with numerous dimensions (subsoil, soil, vegetation…) to the concept of economic territory of which the use by the wine growing refers to the traditional factors of structuring and the use of space (ground, population, financing, nature, …). Considering the use of these various factors within a region, a country or / and between several countries requires: (1) to consider the int…
Endophytic Fungi in Asymptomatic Vitis vinifera L. and their Effects on Plasmopara viticola
2016
During a multi-year study on the life cycle of Plasmopara viticola to assess the typical epidemiology of downy mildew on grapevine (Vitis vinifera) in west Sicily (Italy), several leaves on which the downy mildew had collapsed were found and observed in a vineyard located in Marsala, in Trapani Province. An antagonistic fungus was isolated from these leaves and named A20; through its morphology, it was identified as a hyphomycete belonging to the genus Acremonium. The antagonism of A20 against the asexual and sexual spores of P. viticola, as well as endophytic nature of the genus Acremonium in V. vinifera were confirmed by further studies which have been carried out over the past decade. In…
"On-the-go" multispectral imaging system embedded on a track laying tractor to characterize the vine foliage
2015
Mutispectral imaging systems are widely used in remote sensing for Precision Viticulture. In this work, this technique was applied in the proximal sensing context to characterize vine foliage. A mobile terrestrial experimental system is presented, composed of a GPS receiver, a multi-spectral camera acquiring visible and near infrared images, and a Greenseeker RT-100 which measures the Normalized Difference Vegetative Index (NDVI). This optical system observes vine foliage in the trellis plan, in natural sunlight. The experimental field is planted with Chardonnay, Pinot Noir and Meunier cultivars in a latin squared pattern. In 2013, six datasets were acquired at various phenological stages.S…
Ārējo ekonomisko pārstāvniecību ietekme uz Latvijas eksportu
2016
Sadarbības attiecību dibināšana ārvalstīs, ko dēvē par internacionalizāciju, stiprina izaugsmi, uzlabo konkurētspēju un atbalsta ilgtspēju uzņēmumā. Tas ir liels un sarežģīts solis lielākai daļai mazu ražotāju. Lai palīdzētu uzņēmumiem pārvarēt grūtības, daudzās pasaules valstīs tiek izstrādātas atbalsta programmas. Latvijas Investīciju un attīstības aģentūras un tās ārvalstu pārstāvniecību darbības rezultāti nekad netika pētīti. Darba mērķis ir ar ekonometriskām metodēm novērtēt ārvalstu ekonomisko pārstāvniecību ietekmi uz Latvijas eksportu. Pētījumā iegūtie Latvijas eksportu ietekmējošo faktoru novērtējumu rezultāti nav stabili un ir interpretējami ar piesardzību. Modeļi, kuros tika novē…
Mohorovičiča virsmas modeļa izveide Latvijas teritorijai pēc gravitācijas lauka mērījumu datiem
2019
Maģistra darba “Mohorovičiča virsmas modeļa izveide Latvijas teritorijai pēc gravitācijas lauka mērījumu datiem” mērķis ir izveidot Zemes garozas biezuma modeli Latvijas teritorijai, izmantojot pieejamos gravitācijas lauka un seismisko profilu mērījumus. Pētījumā ar statistiskām metodēm veikta gravitācijas lauka mērījumu apvienošana vienā datu kopā. No gravitācijas datiem, Pārkera-Oldenburga inversijas algoritma un seismiskiem profila mērījumiem aprēķināts Mohrovičiča (Moho) virsmas modelis Latvijas teritorijai Izveidotais Zemes garozas biezuma modelis labi parāda galvenās biezuma izmaiņu tendences, bet nav pietiekoši precīzs, lai noteiktu mazas, neliela mēroga izmaiņas Moho virsmā. Modeļa …