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The objective of this study has been to determine vitamin C content in tubers of edible potato following an application of systemic insecticides to control the Colorado potato beetle. A field experiment was conducted on soil of a good rye complex in 2004-06. The experiment was designed as randomized sub-blocks with three replications. Experimental factors included three cultivars of potato Wiking, Mors, Żagiel - and six Colorado potato beetle control treatments using the following insecticides: Actara 25 WG (thiametoksam) at the rate of 0.08 kg/ha, Regent 200 SC (fipronil) at the rate of 0.1 dmVha, Calypso 480 SC (thiacloprid) at three rates (0.05, 0.075, 0.1 dm³/ha), and a control treatment without chcmical protection. The content of vitamin C was dependant on cultivar, insecticide treatment, and environmental conditions with each year. The insecticides applied significantly increased vitamin C content (amounted to 1.7 mg/kg) compared with the tubers harvested from the control treatment where no chemical protection was applied. Tubers of Mors cultivar had the highest vitamin C content, and Wiking cultivar lowest.
The aim of research was to define the influence treatment methods involving application of growth biostimulators and herbicide on the total yield of edible potato. The field research was conducted in 2015-2017 in the area of eastern Poland, in Lublin Voivodship. The experiments were performed in three replications using the randomized split-block method. Examined factors were: The examined factors included: I. factor – three early cultivars of edible potato (Owacja, Bellarosa, Vineta), II. factor – treatment methods involving application of growth biostimulators and herbicide: GreenOK-Universal Pro and Asahi SL as well as their combination with the Avatar 293 ZC herbicide. The highest total yield of tubers was obtained from object 4., where prior to sprouting, mechanical treatment was used, and after the final shaping of ridges and just before sprouting the Avatar 293 ZC herbicide was applied at a dose of 1.5 dm3 ha–1, and then after sprouting the GreenOK Universal-PRO was applied three times at doses: 0.10 dm3 ha–1 – full moon-end of seeding + 0.15 dm3 ha–1 – covering inter-rows + 0.15 dm3 ha–1 – formation of flower buds (an average of 41.8 t ha–1) and from the object 5., on which mechanical treatment was used to the seeding, and after the ultimate formation of furrows before seeding of potato plants, Avatar herbicide 293 was applied in a dose of 1.5 dm3 ha–1 (total yield amounted to, on average, 40.6 t ha–1). Potato cultivars cultivated in the experiment and meteorological conditions during the conducted tests also had a significant impact on the size of the total yield. Owacja noted the highest yields (an average of 41.4 t ha–1). The largest total yield was collected in 2016 (an average of 42.8 t ha–1). A significant influence of the experiment factors on the structure of large tuber yields was also found.
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Mechanizmy ksztaltowania cen ziemniakow jadalnych

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The effect of nitrogen fertilisation and microbial preparations on the content of dry matter, starch, total protein and nitrates (V), raw potato tuber flesh tendency to darkening and the size of edible potato tuber storage losses was assessed in field experiments. The experimental factors were nitrogen fertilisation levels: 0, 60, 120 and 180 kg N ha–1 and preparations: BactoFil B 10, Effective Microorganisms EM and UGmax soil fertiliser. The level of nitrogen fertilisation and application of microbial preparations had a significant effect on shaping the chemical composition and storage durability of potato tubers, however no influence of these factors was noted for the intensity of raw tuber flesh darkening. Increase in nitrogen fertilisation level was accompanied by a decrease in the content of dry matter and starch, whereas total protein and nitrate contents were increasing. Moreover, nitrogen fertilisation caused a significant increase in natural depletion in tubers during a 6-month storage period. The influence of microbial preparations on the tuber chemical composition was different than nitrogen fertilisation effect. Application of BactoFil B 10 preparation favoured accumulation of dry matter and starch in tubers, application of Effective Microorganisms EM preparation contributed to an increase in starch and nitrate content, whereas after using UGmax soil fertiliser a significantly lower total protein content was registered than in the case of the control.
W pracy przedstawiono wyniki wieloletnich oznaczeń zawartości azotanów i•sumy glikoalkaloidów w dojrzałych bulwach jadalnych odmian ziemniaka.
The aim of this research work was the observation of changes in the qualitative and quantitative parameters of five cultivars of edible potatoes: Agria, Impala, Picasso, Raja, Santé. Samples were stored under regulated conditions in the storage room of the farm Agropartner Plavecké Podhradie, in the branch of Sološnica, Slovakia. Samples were taken three times during the tuber storage. The following parameters were investigated during three years observations: content of dry matter, starch content, total sugars, reducing sugars, nitrates and the content of vitamin C. Considering the dry matter content as the basic stabilizing component, the cv. Santé is the most appropriate for storage. Starch level was the highest in cvs Raja and lowest in Impala. Taking sugar levels into consideration we recommend cv. Agria as the most appropriate and the most stable for storage. This cultivar is the most suitable for technological processing and manufacture of French fries and chips as well. Regarding the nitrate cumulation, all cultivars may be considered to be safe, the determined levels of nitrates were low. The values of vitamin C were lower as compared to the potential levels of this component in edible potatoes. The highest level was in the cv. Agria. This parameter also showed the least fluctuations.
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