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Utrzymanie sie Lolium perenne i Poa pratensis w runi pastwiskowej na glebie torfowo-murszowej

100%

Warda M. , Krzywiec D.

2002

tom 05

173-180

The grazing studies were conducted in two experiments established in 1996 and located on peat-muck soil. A randomised block design with four replications was used. The investigations with two sward types in every trial aimed to compare the maintenance of Lolium perenne and Poa pratensis in the pasture under postboggy habitat. The mentioned species were the main grass components in grass-clover mixtures, fertilized with 40 kg ha⁻¹ N and also in grass mixtures, fertilised with 40, 80 and 120 kg ha⁻¹ N. Seven cultivars or Trifolium repens were included to grass mixtures. As the white clover cultivar was never significant then the results from the seven grass-clover treatments were pooled in the data presentation. The pasture swards were grazed rotationally with Limousine cattle four times a grazing season. Samples of the herbage were analysed for the botanical composition by manual separation and expressed on a weight basis. Lolium perenne grew well in postboggy habitat and became rapidly predominant species in grass and grass-clover sward. Low resistance to frost in December and January in 1996 to 1997 was the most important reason of Lolium perenne content variation in the pasture sward. However, during the vegetative season of 1997 proceeded good regeneration of this species. Development of Poa pratensis in the sward also depended on climatic conditions. High rainfalls in late autumn of 1996 and 1997 influenced negatively stability of this specics in the grass community. Presence of Trifolium repens in the pasture sward affected beneficially the wintering of Lolium perenne and favoured the expansion of Poo pratensis.

Wieloodmianowe zasiewy motylkowo-trawiaste sposobem na zwiekszenie roznorodnosci florystycznej i wartosci paszowej runi pastwiskowej

80%

Warda M. , Cwintal H. , Krzywiec D.

tom 442

453-464

Assessment of the effect of sown mixtures composition on floristic composition and value of pasture sward was a purpose of the studies. White clover maintained the best in the sward. There were confirmed higher seasonal changes of white clover, bird trefoil, black medic and alfalfa content in the pasture sward on mineral soil than on peat-mursh soil. Introduction of some perennial ryegrass cultivars ensured predomination of this species in the sward even under peat-mursh soil conditions.

Wplyw typu gleby na zawartosc azotu i fosforu w wodach gruntowych pastwisk dla bydla

80%

Warda M. , Smolen E. , Cwintal H. , Krzywiec D.

tom 75

351-154