Ograniczanie wyników

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

Znaleziono wyników: 77

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 4 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  Rhizobium
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 4 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
Rhizobium strains isolated from nodules of the different legumes including wild-growing plants were examined for their siderophore activity. Fifteen of the 84 screened rhizobial strains were able to grow under conditions of limited iron supply. Nine of them gave orange halos in the assay with Chrom azurol S. Among these strains were Rhizobium sp. (Ononis) and Rhizobium (Genista), producing hydroxamates and phenolates. These compounds could promote the growth of siderophore-negative bacteria on iron-deficient media. The results imply that the hydroxamates from G1 and Ol strains may belong to the monohydroxamate class of siderophores.
10
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Wplyw wybranych pestycydow na drobnoustroje glebowe

75%
Określono wpływ fungicydowej zaprawy nasiennej Funaben T i herbicydu Pivot 100SL na przeżywalność rdzennych bakterii z rodzaju Rhizobium oraz innych wybranych grup drobnoustrojów glebowych w doświadczeniu modelowym. W przeprowadzonym doświadczeniu glebę inkubowano w słojach w temperaturze 25°C w następujących kombinacjach: 1) gleba - kontrola, 2) gleba z dodatkiem fungicydu, 3) gleba z dodatkiem herbicydu, 4) gleba z dodatkiem fungicydu i herbicydu. W 3, 7, 14, 30 i 60-tym dniu inkubacji określano dla każdej kombinacji, wpływ zastosowanych pestycydów na: Rhizobium, Azotobacter, grzyby, ogólna ilość bakterii i promieniowców. Nie bez wpływu okazały się zastosowane pestycydy dla badanych grup drobnoustrojów glebowych, powodując hamownie lub stymulowanie ich namnażania, szczególnie w pierwszych dniach po zastosowaniu, w dalszych terminach często stymulowały ich rozwój.
On the experimental plots, five legume-grass mixtures were cultivated. The composition of these mixtures included: red clover, white clover, alfalfa, festulolium, cocksfoot, timothy grass, perennial ryegrass and Italian ryegrass in different proportions. Mixtures were fertilised with: P₂O₅ - 80 kg ha⁻¹ year⁻¹, K₂O - 100 kg ha⁻¹ year⁻¹ and 30 kg ha⁻¹ NH₄NO₃ before every regrowth. Additionally half of the plots were fertilised with MgO - 30 kg ha⁻¹ year⁻¹. Dinitrogen fixation activity and influence of magnesium on this process were measured directly in the field conditions under these mixtures with using of acetylene to ethylene reduction method (ARA). It was concluded, that nitrogen in these cultivation originating from biological fixation reached even up to 208 kg N per hectare per season. The magnesium fertilisation additionally increased dinitrogen fixation from 26 to 200% as compared it with no magnesium fertilising combinations.
The results of investigatiolls on the effect of soil microflora on Rhizobium and Bradyrhizobium strains development, their symbiosis activity with Legume plants and the effect of joined seeds inoculation with specific symbiotic bacteria and Azospirillum or/and Azotobacter strains are discussed. The results show the presellce of high number of antagonistic microorganisms to symbiotic bacteria, which could inhibit their growth, proliferation and survival in soil environment. This confirms the necessity of pre-sowing Legume plant seeds inoculation with specific symbiotic bacterial strains. Many investigators have observed the beneficial effect of joined Legume plant seeds inoculation with specific symbiotic bacteria and correctly selected Azotobacter or/and Azospirillum strains on symbiosis effectivity. The studies have shown that the effect of joined inoculation is influenced by plant species and cultivars, strain properties, the ratio of inoculant cell number in prepared inoculum, and the way and term of inoculum application. The studies leading to the explanation of mechanisms of the Azospirillum and Azotobacter influence on symbiosis are also discussed here.
This study was conducted to evaluate the effect of rhizobial population on the effectiveness of locally isolated elite isolates of Rhizobium on common bean at the major growing area of Eastern Ethiopia. The result showed significant effect of inoculation, the varieties and their interaction on nodulation, yield and yield traits, except for the number of seed per pod. Most of tested Rhizobium isolates significantly improved the nodule number and nodules dry weight in all soils regardless of rhizobial population. Significant increase in total biomass yield and grain yield of common bean was recorded with NSCBR-14, inorganic N-fertilized and NSCBR-(25)₂ treatments in soil with a high, low and moderate rhizobial population, respectively. The highest values of most of the yield traits including NN and NDW in all experimental sites was recorded with Dursitu variety but the highest values GY and TBY with Kufanzik. Hence, the indigenous rhizobial population did not affect the effectiveness of inoculation but the soil types and varieties affect the effectiveness of the isolates.
Nine rhizobial strains isolated from the root nodules of Cicer arietinum, Vigna radiata, V. mungo, Samania saman, Sesbania sesban, Leucinia sp., Prosopis cineraria and Medicago sativa were used to study their effects on root-infecting fungi viz., Macrophomina phaseolina, Fusarium u solani and Rhizoctonia solani. In dual culture plale assay, strains of Brudyrhizobium sp., and R. meliloti were found to inhibit radial growth of M. phaseolina. F. solani and R. soluni producing zones of inhibition, Brudyrhizobium sp., and R. meliloti either used as seed dressing or as soil drench significantly suppressed root-rot infection caused by M. phaseolina, F. solani and R. solani in okra, a non-leguminous crop under greenhouse conditions. Biomass of plants was also higher in the presence of rhizobia.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 4 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.