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Common walnut, due to decorative habit of its crown, is a frequently growing tree in Lublin’s parks and gardens. Its presence in the town landscape provokes deeper analysis of the fauna occurring on it. The aim of this paper was to trace the changes in numerical force with reference to the weather conditions system, as well as to establish the bionomics of Panaphis juglandis (Goeze) occupying the trees of Juglans regia L. Studies were conducted on common walnut (Juglans regia L.) in Lublin in 2006–2008. Three locations were designed for observation: garden (A), park (B) and street-side (C). Numerical strength and bionomics of P. juglandis were determined. The greatest number of aphids was reported in the year 2007 in the park location. The course of weather conditions significantly affected the terms of spring and autumn presence of aphids. Warm spring with not very intense precipitation enhanced the development of P. juglandis. However, torrential rains and air temperatures exceeding 30ºC in summer limited the population dynamics of this aphid. In the developmental cycle the appearance of subsequent generations was observed from family founders through virginoparous females to sexual generation. Studies on female fecundity were performed. In all the study years the highest mean fecundity was that of the family founders, and the lowest was found in the females of sexual generation. The most fecunde virginoparous females (68.4 larvae · female-1) were observed in spring 2006 in the street location. Observations were also undertaken, which concerned determining the place and term of aphid occurrence, as well as the number of eggs on lignified sprouts of Juglans regia L. The highest number of eggs was reported in 2008 in the park location.
Common walnut has gained recognition in Poland as a tree decorating the space around us because of its habit and impressive leaves. More and more frequent use of walnut in the city landscape induced a more thorough analysis of the factor causing a significant decrease in the decorative values of this plant. The aim of this paper was to trace the numerical strength dynamics of Ch. juglandicola occupying the Juglans regia L. trees, referring to the weather conditions system and to determine the harmfulness degree of the above- mentioned plant louse species. Studies were conducted on walnut trees (Juglans regia L.) in Lublin in the years 2006–2008. Three stands in housing estate areas were selected for observation: (A) –a park estate of single-family houses (B) –in the University Campus area, and near the street (C) –at the crossroads of busy streets near the petrol station. The terms of occurrence of this plant louse, as well as the dynamics of its numerical strength were determined against the background of weather conditions. It was established that Chromaphis juglandicola (Kalt.) occurs on the Juglans regia L. trees growing in Lublin town plantings. It was reported that these plant lice occurred most numerously in the year 2007 on the housing estate post. Ch. juglandicola were observed at the bottom side of the leaf blade in dispersion. The terms of spring appearance and autumn disappearance of plant lice were significantly affected by the course of weather conditions. Their development was enhanced by warm spring with not very intense precipitation. However the air temperature above 30ºC and storm-like down pouring rain in summer limited the numerical strength of Ch. juglandicola.
W latach 1998-2000 przeprowadzono dwuczynnikowe doświadczenie polo­we, w którym badano wpływ różnych metod uprawy i zagęszczeń roślin na jakość lonasu rocznego (Lonas annua (L.) Vines et Druce) w warunkach glebowo- kli­matycznych Lubelszczyzny. W doświadczeniu uwzględniono następujące czynniki: uprawę z rozsady i siewu wprost do gruntu i zagęszczenie roślin na jednostce po­wierzchni - 50, 35, 25, 20 i 16 szt.-m2. Z przeprowadzonych obserwacji i obliczeń wynika, że uprawa z rozsady wpłynęła korzystnie na jakość roślin lonasu rocznego. Ponadto uprawa z rozsady znacznie przyspiesza zbiór roślin. Badania jednocześnie dowodzą, iż wysokość pędu głównego roślin lonasu uprawianego z siewu przy największym zagęszczeniu (50 szt.·m⁻2) osiągnęła najwyższą wartość.
W latach 1998 - 2000 przeprowadzono dwuczynnikowe doświadczenie połowę, w którym badano wpływ różnych sposobów metod i zagęszczeń roślin na plonowanie i walory dekoracyjne lonasa rocznego (Lonas annua (L.) Vines et Druce) w warunkach glebowo-klimatycznych Lubelszczyzny. W doświadczeniu uwzględniono następujące czynniki: uprawę z rozsady i siewu bezpośrednio do gruntu i zagęszczenie roślin na jednostce powierzchni - 50, 35, 25 , 20 i 16 szt.·m⁻². Z przeprowadzonych obserwacji i obliczeń wynika, że uprawa z rozsady wpłynęła korzystnie na liczebność i jakość kwiatostanów lonasa rocznego. Badania jednocześnie dowodzą, iż plon kwiatostanów z jednej rośliny lonasa uprawianego z rozsady przy najmniejszym zagęszczeniu (16 szt.·m²) był najwyższy. Ponadto uprawa z rozsady znacznie przyspiesza zbiór roślin.
Between the years 1998–2000, comparative studies were carried out on the influence of propyzamide (0.750 and 3.500 kg ha⁻¹), trifluraline (0.625 and 1.000 kg ha⁻¹), propachlor (3.250 and 4.450 kg ha⁻¹), chloridazone (4.615 and 6.153 kg ha⁻¹) and metolachlor (1.440 and 1.728 kg ha⁻¹) on the weed population, (Nigella damascena L.) cultivated for dried bouquets in the soil-climatic conditions of the Lublin Upland and on their influence on cultivated plants. Propachlor proved to be the most effective preparation in weed control. Chloridazone caused inconsiderable and passing damage of seedlings Nigella damascena L.
The experiment was conducted in 2011–2012. It included an analysis of the spontaneous flora of 7 cemeteries: 3 cemeteries located in the centre of Lublin (Lipowa Street, Unicka Street, and Kalina Street), 1 on the outskirts of the city (Majdanek), 1 located in a small town (Łęczna), 2 sites are rural cemeteries (Łuszczów, Ostrówek). An inventory was made of spontaneous vascular flora present at the investigated sites. The plants were described in respect of their affiliation to geographical- historical groups, life forms as well as the presence of honey species (polleniferous and nectariferous) and protected species. Within the area of these 7 necropolises, the presence of 382 taxa was found. The number of taxa observed at the individual sites varied between 124 and 274 in the metropolitan zone, 146 in the urban zone, and between 110 and 146 in the rural areas. The area richest in terms of flora was Majdanek where 274 species of plants were found, while the cemetery in Łuszczów was the least rich – 110 species. The highest precentage of hemicryptophytes was observed in Ostrówek (50.7%), the lowest in Lublin – Kalina (40.3%). In the case of therophytes, the greatest variation was observed in the urban cemetery in Unicka Street (32.6%), while the least varied site was the cemetery in Ostrówek (23.3%). The average precentage of geophytes was 12.1%, with the greatest number in Łuszczów (16.4%), and the smallest one in Majdanek (8.4%). Chamaephytes were characterised by a small percentage (between 5.1% and 4.4 %), similarly to nanophanerophytes (6.2% to 2.7%), and megaphanerophytes (9.6%–1.8%). The investigated sites were dominated by apophytes, the percentage of which varied between 52.3% in the Lublin cemeteries on Lipowa and Unicka Streets, and 44.5% in Ostrówek. Among anthropophytes, there were mostly archeophytes (between 26.3% in Łuszczów and 13.1% on Lipowa St. in Lublin). The percentage of diaphytes varied between 16.5% in Ostrówek and 7.2% in Lublin – Kalina, whereas that of kenophytes was between 15.1% in Ostrówek and 8.2% in Łęczna. In the case of spontaneophytes, the percentage varied between 8.8% in Lublin – Majdanek and 2.7% in Łuszczów. The majority, 299 of the taxa found, proved invaluable to insects (polleniferous and nectariferous). Among the plants growing spontaneously in the analysed cemeteries, there were also 11 legally protected species.
In the years 1998–2000, studies were undertaken to determine the optimal sowing date and sowing density for the field cultivation of (Lonas annua (L.) Vines et Druce). Seeds were sown in three different periods, on the following dates:1st period – 4th May, 29th and 28th April; 2nd period – 14th, 10th and 8th May; 3rd period – 24th, 20th and 19th May. Five sowing rates were applied on each of the sowing dates, i.e.: 40, 60, 80, 100 and 120 g·100 m⁻². The favourable influence of the early sowing dates on the plants quality was observed. Moreover, it was proved that plants grown on plots with the lowest sowing rates were characterised by the highest number of embranchments of the I order.
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