Ograniczanie wyników

Czasopisma help
Autorzy help
Lata help
Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 37

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  cultivation condition
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
Aroma in samples of two varieties of Agaricus bisporus, i.e. KORONA 7 and EUROMYCEL 12, was analysed in terms of contents of eight carbon atom compounds (1-octen-3-ol, 3-octanone, 3-octanol, 2-octen-1-ol). Carpophores were harvested in 4 flushes according to their cap sizes. Quantitatively the dominant compound in all samples was 1-octen-3-ol, found in the highest concentrations in the 1st flush of yielding. The analysis of variance for factorial experiments, performed for both cultivars in one cultivation cycle – 2001/2002 and for one variety – KORONA 7 in two cycles, showed the effect of mushroom variety, flush of yielding and carpophores size on contents of dry matter and aromatic volatiles. Carpophores of a smaller cap diameter were characterised by a higher dry matter content and usually also higher contents of aromatic volatiles. In contrast, the effect of flush of yielding was different: the highest content of dry matter was recorded in the 4th flush, while that of aromatic compounds in the 1st flush.
The research on the flowering of Arnica montana L. and A. chamissonis Less, was carried out in the years 2005-2006 on two- and three-year plantations on grey-brown podsolic soil with the granulometric composition of heavy clay sand. The aim of the work was to determine the pattern and length of flowering of two- and three-year-old plants under field cultivation conditions with successive flower head collection. The flowering of Arnica montana in both years of study lasted 26 days (from the 28th of May to the 22nd of June). In this period, eight collections of flower heads were made. When analyzing the number of inflorescences gathered during particular collections, it was concluded that at the initial stage of flowering it was not great, but it successively increased with the passage of time up to the seventh collection. The pattern of flowering of the two- and three-year-old Arnica montana plants was similar. The inflorescences of Arnica chamissonis were collected six times, and the most abundant flowering was found in the middle period of this stage, which lasted 20 days.
Skład olejku z Coriandrum sativum L., uzyskanego za pomocą destylacji wodnej, destylacji ciśnieniowej i ekstrakcji heksanem, analizowano przy użyciu GC/MS. Najwyższą wydajność olejku otrzymano w trakcie ekstrakcji (1,63%). Zawierał on w swoim składzie linalol (63, 3%), α-pinen (6,1 %) i p-cymen (5,0%). W olejkach uzyskanych na drodze destylacji wodnej i destylacji ciśnieniowej zawartość tych składników była wyższa.
The growth of Topospora myrtilli isolates, obtained in the years 2001-2003, was studied on PDA medium at –10, +2, +6, +12, +18, +22 and +28oC. The growth and sporulation of the isolates were observed at +22oC on the following culture media: PDA, maltose – MA and mineral – MSA, as well as on two versions of oat media, one containing 20 g of oat fl akes per litre (OA-20), and the other containing 50 g of oat fl akes per litre (OA-50). The observations of the linear growth of colonies of the studied strains were carried out during a period of 21 days, whereas the formation of morphological structures until the 52nd day of cultivation. It was found that T. myrtilli can grow and sporulate in a wide range of temperature, even at +2oC. The pathogen growth activates with the increase of temperature, up to the optimal temperature, i.e. from +18oC to +22oC. The increase of temperature to +28oC did not favour the mycelium growth and prevents pathogen sporulation. PDA, OA-20, OA- 50 and MA media can be considered to be the most suitable for the growth and development of T. myrtilli, due to the intensive growth and formation of typical macro- and microscopic features. It is necessary to emphasise the great usefulness of oat medium, especially OA-50, for the cultivation of Topospora myrtilli, in the aspect of sporulation of the fungus. It was found that mineral medium is unsuitable due to the formation of mycelium with an untypical structure and colouration as well as late conidial sporulation.
Studies were carried out on the effect of inoculation with Azospirillum brasilense on development and yielding of winter wheat and oat. Plants were grown in the field conditions. In the experiments conducted in randomized block design, three factors were applied: inoculation with an active strain of Azospirillum brasilense, two levels of nitrogen fertilizer and seed treatment with fungicidal seed dressing. It was found, that inoculation of cereals with active strain of Azospirillum brasilense may be a factor increasing their vigour and yielding. Under climatic and soil conditions of Wielkopolska region and despite the fact, that no dinitrogen fixation was observed, cereal inoculation with Azospirillum brasilense contributed to the yield increase up to 27% in wheat and to 6% in oat.
Wykorzystując dane meteorologiczne ze stacji IMGW zlokalizowanych na obszarze Polski północno-wschodniej dokonano charakterystyki okresu wegetacyjnego i aktywnego wzrostu roślin. Okres badań obejmował lata 1951-2000 dla stacji meteorologicznych: Białystok, Elbląg, Kętrzyn, Olsztyn i Suwałki oraz lata 1966-2005 dla stacji w Mikołajkach. W okresie wegetacyjnym, określonym wartością progową średniej dobowej temperatury powietrza 5°C, wyznaczono daty rozpoczęcia, zakończenia oraz liczbę dni. Okres aktywnego wzrostu roślin, wyznaczony wartością progową średniej dobowej temperatury powietrza 10°C, scharakteryzowano podając daty rozpoczęcia, zakończenia długość trwania a także sumę temperatur średnich dobowych powyżej ustalonego progu termicznego. Z analizy przeprowadzonych badań wynika, że czas aktywnego wzrostu roślin oraz sumy temperatur w tym okresie są najniższe w Polsce wyłączając obszary górskie i dlatego też wielkoobszarowa uprawa istniejących odmian krzewów winorośli, których wartość graniczna potrzeb cieplnych wynosi 2500-2750°C obarczona jest wysokim ryzykiem. Poniżej przedstawiono liczbę dni trwania okresu aktywnego wzrostu roślin i średnią sumę temperatur w tym okresie w badanych miejscowościach: Białystok 150 dni (2347°C), Elbląg 155 dni (2408°C), Kętrzyn 149 dni (2305°C), Mikołajki 153 dni (2384°C), Olsztyn 149 dni (2307°C), Suwałki 143 dni (2190°C).
The influence of inoculation with Azospirillum brasilense strain, two levels of nitrogen fertilizer, and seed treatment with fungicidal seed dressing on the development acid yield of maize were determined in field experiments. In these studies nitrogenase activity, chlorophyll content in plants, yield size and quality were used as control parameters. It has been found that inoculation of maize crops with an active strain of Azospirillum brasilense has a beneficial effect on maize vigour and yield under the climatic and soil conditions of the Wielkopolska region.
W trakcie dwuletnich badań oceniano wpływ warunków uprawy na wzrost i kwitnienie Zephyranthes grandiflora LINDL. Bulwy zostały posadzone do doniczek o średnicy 13 cm, a następnie podzielone na dwie grupy: rosnące w szklarni oraz poza nią w ogrodzie. W obu latach doświadczenia bulwy rosnące w szklarni kwitły wcześniej i wydały więcej kwiatów. Rośliny uprawiane w warunkach szklarniowych miały również większą wartość dekoracyjną, tworzyły dłuższe łodygi i kwiaty o większej średnicy. Wykazano również, iż bulwy mateczne rosnące w ogrodzie tworzyły mniej bulw potomnych, gorszej jakości, w porównaniu z zebranymi w szklarni.
Acta Agrobotanica
|
2005
|
tom 58
|
nr 2
189-195
The research was conducted in a mushroom growing facility located near Rzeszów, consisting of three production cycles. The number and composition of microorganisms which accompany the mushroom cultivation depended on the healthiness of: the compost, casing and spawn of Agaricus bisporus. The presence of pathogenic fungi in the cultivation halls at the beginning of the production cycle is a serious threat to the cultivation of common mushroom because the irrapid development shortens the span of fruiting body harvests.
The aim of the research was to identify characters which determine the yield and the content of silymarin in the fruits (achenes) of Silybum marianum as well as to show the range of their variation. The research was performed based on field experiments conducted at the Mochełek Research Station (53°13’ N; 17°51’ E) over 2003-2005. Fruit yield and the content of silymarin were affected mainly by weather conditions, the forecrop and the sowing time. The coefficient of variance for fruit yields was 37.3%, and the content of silymarin – 12.7%. Plant height prior to harvest, number of fruits per anthodium on lateral and main shoots, thousand fruit weight, number of anthodiums with pappus and number of all the anthodiums per plant were significantly correlated with fruit yield. The content of silymarin was positively correlated with the number of plants per m² prior to harvest, plant height prior to harvest and fruit yield, and negatively correlated with the content of total N in the reserve material of fruits. The content of flavonolignans which make up the silymarin appeared relatively constant and only silydianin changes slightly more than the content of silychristin and isosilybin.
A field experiment was conducted in the years 2008- 2010 at the Research Station of the Faculty of Agricultural Sciences, University of Life Sciences in Lublin, on brown soil with a slightly acidic pH, a high content of available phosphorus and potassium as well as an average magnesium content. The experiment was set up in a random split-plot design with four replications, with two methods for controlling weed infestation: I. mechanical – weeding of inter-rows twice; II. chemical – the herbicide Afalon Dyspersyjny 450 SC (a.i. linuron, 900 g×ha-1). Next, potassium, calcium and magnesium contents were determined in maize and in the dominant weed species. Based on the dry weight yield of maize and the biomass of particular weed species, nutrient uptake per hectare area was calculated. The chemical method of weed control reduced both the number and dry weight of weeds more than the mechanical method. The dominant species in the maize crop were Echinochloa crus-galli (L.) P. Beauv., Chenopodium album L., Galinsoga parviflora Cav., and Cirsium arvense L. All the weed species examined were more competitive than maize in accumulating potassium, calcium and magnesium. Galinsoga parviflora Cav. was the most competitive species with maize for potassium, Cirsium arvense L. for calcium, and Chenopodium album L. and Polygonum lapathifolium L. subsp. lapathifolium for magnesium. Weeds are serious competitors in taking up nutrients relative to crop plants; their share in the total uptake of macroelements from the soil by the maize crop and weeds together was considerable and it averaged as follows: for K – 35%, Ca – 27.3%, Mg –27.4%.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.