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Influence of foliar application of phenylalanine and urea at two doses to vineyards on grape volatile composition and amino acids content
Get PDFThe aim was to study the effect of phenylalanine (Phe) and urea (Ur) foliar applications to vines at two dosages on grape volatile and amino acid content. Results showed that the foliar application of both dosages of phenylalanine and the highest dose of Ur favored the synthesis of the aromatic positive compounds, decreasing the presence of C6 compounds in the grapes. Total amino acid content was not modified by the treatments. The treatment that most affected the concentration of amino acids was the lowest dose of Ur, increasing the content of seven amino acids. Phe applications increased the concentration of this amino acid. Therefore, foliar treatments with Phe and Ur were a suitable tool to improve grape volatile composition without affecting grape total nitrogen content
Evaluation of photosensitive films for light measurements in the fruiting zone of grapevine canopies
Get PDFThe potential influence of fruit exposure and canopy manipulations on grape berry composition is well recognized. However, a simple and low cost method for quantifying the amount of light reaching the fruiting zone is lacking. The objective of the present study was to test the application of a commercial system of photosensitive azo-dye coated plastic films for characterizing light conditions within grapevine canopies. The fading rates of three films of differing light sensitivity were initially monitored in a fully exposed position, and these all showed a linear or near linear relationship with radiation measured by an adjacent global solar radiation sensor. When mounted in the fruiting zone of a vertically trained cool climate \u27Riesling\u27 vineyard for two periods following early and late leaf removal treatments, the films were able to quantify the change in light exposure within the fruiting zone. Total radiation values calculated using an on-site calibration or manufacturer´s equation were comparable. While some consideration is needed with regard to the choice of film sensitivity and positioning within the canopy, these initial evaluations suggest these light sensitive films can provide a simple and accurate method for characterizing light conditions and quantifying cumulative radiation within the fruiting zone
Gehalte an Tanshinonen und Phenolsäuren in den Wurzeldrogen des Chinesischen Salbeis (Salvia miltiorrhiza Bunge)
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Network of reference farms for plant protection Bi-Annual Report 2015 and 2016 - Analysis of Results of 2007 to 2016
Get PDFSchlussbericht zum Vorhaben Monitoring zum Vorkommen bodenbürtiger Viren in Weizen, Triticale und Roggen in den wichtigsten Getreideanbaugebieten Deutschlands
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