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The aim of this study was to assess the effect of irrigation on the content and yield of starch in several potato cultivars grown in different regions of Poland. Field experiments were conducted over the period 2009-2011 in Experimental Stations belonging to the Research Centre for Cultivar Testing in Słupia Wielka. Three factors were analysed: cultivation technology: (a) with irrigation and (b) without irrigation – as the control treatment; potato cultivars (Bellarosa, Cyprian, Owacja and Vineta) and three locations (Masłowice, Szczecin Dąbie, Węgrzce). The study was conducted with the randomized split-plot design with three replications. Permanent fertilization applied in the experiment amounted to: 100 kg N, 43.6 kg P and 124.5 kg K·haˉ¹. Cultivation and plant protection measures were performed in accordance with the principles of good agricultural practice. Irrigation was used when moisture content in the soil layer (0-30 cm) fell below 70% of the field water capacity. Tuber harvest was performed during their full physiological maturity. Tuber yield and the content and yield of starch were determined during harvest. Obtained results were subjected to analysis of variance (ANOVA). Significant effect of the studied factors on starch content and yield was proved. For starch yield, interaction between experimental location and cultivars, technology and irrigation and location, and the years of study and cultivars also appeared to be significant.
The influence of herbicides on protein and starch content in barley grain was examined.
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.
We examined whether peroxidase activity in cutting bases and leaves and starch content in cutting bases can be used as rooting phase markers in the elepidote rhododendron cv. 'Babites Baltais' (Rhododendron L.). Changes in peroxidase activity in cutting leaves and bases, as well as starch content in cutting bases, were determined in relation to anatomical stages of rhizogenesis in leaf bud cuttings treated with 1% indole-3-butyric acid (IBA+) or without IBA (IBA–). The pattern of change of peroxidase activity was similar in cutting bases and leaves of IBAleaf bud cuttings. Three phases of adventitious root formation were identified: induction, initiation and expression. During the induction phase peroxidase activity decreased, but no anatomical changes were observed in the cuttings. Peroxidase activity increased in the initiation phase when adventitious root initials were formed. Peroxidase activity decreased during the expression phase when adventitious root primordia developed. The starch content of IBA– leaf bud cuttings decreased during the first few days and then gradually rose to maximum, followed by a sharp reduction and another increase at the end of the experiment. The changes of starch content did not coincide with rooting phases as peroxidase activity did, and cannot be used as a rooting phase marker in rhododendrons. Adventitious root formation did not occur in IBA+ leaf bud cuttings, so distinct rooting phases could not be observed. There was a significant correlation between peroxidase activity in cutting bases and leaves of IBA- leaf bud cuttings. Peroxidase activity in leaves of rhododendron leaf bud cuttings are potentially useful as a marker for rooting phases, but that requires further anatomical and physiological study of rooting in leaf bud cuttings.
Investigations were carried out in July on leaves of lilac variously situated in the head on the crown. Net photosynthesis was registered from 6 hr to 20 hr. The insolated leaves in the top part of the crown showed maximum photosynthesis between 8 hr and 11 hr, afterwards the intensity of photosynthesis decreasing in spite of the high intensity of irradiation in the midday hours. The insolated leaves located in the lower part of the crown showed maximum photosynthesis at the time of the greatest incident irradiation of the leaf. Shaded leaves, inside the crown, demonstrated the highest net photosynthesis between 8 hr and 15 hr. This amounted to about 20% of the maximum photosynthesis of insolated leaves. Starch was present in the leaves both during the day and night. Before sunrise starch represented 6% of the dry weight of insolated leaves and 3% of the shaded leaves. In the insolated leaves since sunrise its content quickly increased up to 13-14% and remained at a slightly decreasing level till evening hours. Sunset was followed by a rapid decrease in the starch content in the leaves. In the shaded leaves, throughout day, the starch content remained at a constant level (3%). Intensive photosynthesis of the lilac leaves causes a great accumulation of starch in the insolated leaves during the day. It is the main cause of reduction in the intensity of photosynthesis.
The dynamics of crop increase, changes in starch content and mineral ingredients in the tubers of four potato cultivars - Dorota early, Alicja and Kuba medium-early and Jasia the late - were investigated in precise field experiment and laboratory research. The potatoes were cultivated without mineral fertilization and with mineral fertilization at doses of N - 90, P₂O₅ - 90 and K₂O - 130 kg·ha⁻¹. The mass of tubers and changes in their chemical composition were determined from the fool blooming at about half of July, in two weeks’ intervals. Mineral fertilization had a favorable impact on increase of in the tubers’ weight, level of yielding and the yield of big tubers fractions whereas it did not influence the starch content and its yield. The effect of fertilization on potato productivity distinctly interacted with the genotype. In respect of starch yield it was justified for only one cultivar - Alicja. The genotype and maturity state of tubers as well as applied mineral fertilization modified the contents of nitrogen, potassium and magnesium but did not influence the concentration of phosphorus, calcium and sodium.
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Seniphos w dolistnym nawozeniu ziemniakow

67%
Field experiments were carried out within the years 2002-2005 on the light soil to determine to what exent the nitrogen fertilization modified the starch content in potato tubers. The aim was to settle nitrogen fertilization level for obtaining the highest efficiency and starch yield for 20 new table and starch potato cultivars. In these experiments 5 levels of nitrogen fertilization were applied: 0, 50, 100, 150 and 200 kg N·ha⁻¹, at constant levels of phosphorus - 53.2 kg P·ha⁻¹ and potassium - 149.4 kg K·ha⁻¹. It was found that the nitrogen fertilization stronger diversified the yield of tubers than the starch content. The convergence of tuber yield and starch yield was stronger with reference to nitrogen doses as compared to percentage starch content. For some table cultivars stated high yield of tubers and higher starch content thus the yield of starch was comparable with starch potato cultivars. It was found that along with increasing the nitrogen dose efficiency (kg starch per 1 kg N) decreased significantly.
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