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Effetto della temperatura sulla conservazione della valerianella da IV gamma
No full textThe quality of minimally processed leafy vegetables is defined by the visual appearance and internal phytonutrient contents. The visual appearance depends on the chlorophyll content and other leaf pigments, while the phytonutrients include anthocyans, polyphenols and carotenoids. During the distribution chain the correct storage temperature can preserve for relatively long time the internal and external quality of minimally processed leafy vegetables. The aim of this work was to investigate the effect of two storage temperatures (4 and 10°C) on the quality of lamb’s lettuce (Valerianella olitoria L. Valerianella locusta ). Plants of the cv ‘Trofy’ were grown in floating system with the following nutrient solution concentration (expressed in mM): 13 N-NO3; 1.5 P; 3.5 Ca; 1.7 Mg; 9.5 Na; 8.0 Cl; 2.7 S; 0.04 Fe and micronutrients. The leaves were harvested at commercial maturity stage and minimally processed (washed, dried, graded). Then, they were packed in commercial plastic boxes and stored at 4 or 10°C. The effect of temperature was evaluated measuring the chlorophyll content and the variations of antioxidant compounds such as anthocyans, phenols and carotenoids. The anthocyans did not change in both storage temperatures, while the phenol content significantly decreased in leaves stored at 10°C after 8 days of storage. Total carotenoids, instead, decreased at both storage temperatures, but with different degradation rates
Effect of organic and mineral fertilisation on yield and quality of zucchini
No full textZucchini squash is classified as a high-fertilized vegetable, because of its ability to produce a lot of biomass. The aim of this work was to compare with control the following fertilization treatments, each with 250 kg N, 280 kg P2O5 and 250 kg K2O per hectare: organic fertiliser (pelletted farmyard manure) preplant; slow release fertiliser (15-9-15) integrated with superphosphate preplant; 2/3 organic fertiliser preplant and 1/3 mineral fertiliser (15-15-15) as 3 top dressings (starting from fruit setting); 2/3 slow release fertiliser preplant and 1/3 mineral fertiliser as above. Each treatment was combined with 3 levels of sodium silicate: 0, 6 and 12 L ha-1, applied 3 times as top dressing in combination with 10 kg humic acid ha-1. The experimental design was a randomized block, with 3 replications and plots of 16 m2. During the growing period from June to the end of July the following parameters were recorded: number, length, diameter, fresh and dry weight of fruits and number of male flowers. At the end of the trial the NPK content, the fresh and dry weight of plants and fruits were determined. Results showed that all treatments significantly increased size, weight and number of fruits, number of male flowers, weight of leaves and stems as compared to the control. The dry matter content of fruits, leaves and stems was not affected by treatments. Sodium silicate increased the fruit dry weight, but did not show any significant effect on the other parameters. The yield was significantly higher in the treatments with slow release fertiliser, organic+top dressing, slow release+top dressing than the organic manure and control
Effetto del thidiazuron e della benziladenina sulla qualità post-produzione della stella di Natale
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