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• Spring phonological development of grasses

  89-93

  Geza Nagy

  Views:

  105

  The paper starts with those arguments which underline the scientific importance of the research program entitled “Factors determining forage quality of grasses”. It summarizes the maint features of spring grass development based on the international scientific literature. It describes the methods and material of the research program.
  Based on the results of the 2004 research it presents data for tall fescue (Festuca arundinacea), brome grass (Bromus inermis), perennial ryegrass (Lolium perenne) and thimothy (Phleum pratense) on
  - number of active leaves, at given dates,
  - the sum of the length of active leaves per shoot at given dates,
  - total number of leaves/per shoot developed until the end of the investigations,
  - crude protein and netto energy content of the grasses in the beginning in the middle and in the end of investigation period.
  Conclusions from the research results:
  - the phonological development of grasses is species-specific,
  - after the start of the generative development the active leaf area per shoot is declining,
  1 A dolgozat az MTA Gyepgazdálkodási Bizottságának 2005. július 09-én Beregszászon (Ukrajna) rendezett tudományos előadás bővített változata
  decline in crude protein content of grasses between middle April and June is continues while netto energy content declines between middle April and middle May, but it does not change after words.

• Factors affecting the thousand-grain weight of three grass cultivars

  15-21

  Anita Lepossa

  Adrienn Halasz

  Laszlo Menyhart

  Views:

  86

  We analyzed the effects of temperature, precipitation and the age of the mother plants on the change of an important seed quality parameter, the thousand-grain weight (TGW) in the case of three Hungarian cultivars of different grass species (’Tomaj’ red fescue, ’K-50’ tall fescue and ’K-51’ smooth brome). Examining the seed samples of six years from the stocks maintained at the MATE Georgikon Campus (Keszthely), we found that the age of the stocks did not affect the value of TGW. The age of the stocks did not affect the TGW. Only the heat sum lower than average showed negative effect to the TGW in the linear model applied the heat sum and total precipitation calculated between 1st of May to the harvest date, and the age of the stocks as independent factors. Precipitation had a positive but weak effect, the amount of precipitation calculated from 1st of November of the previous year to harvest correlated better with TGW. We also found that proper purification and the TGW-data correction for the same moisture content are necessary in such a comparative study of TGW values of grass seeds.

• Prospect of extending the grazing season on tall fescue pasture

  7-12

  Marta Bajnok

  Julianna Tasi

  Views:

  55

  In Central European relation, no significant experience is available regarding the yield and quality of winter harvest pastures. The aim of our research was to collect information about the effect of pre utilisation (July, June, and August) and winter harvest date (November, December, January) on the quantity and quality of fodder The examined values were the dry matter yield, energy-, ADF-ADL and ergosterol contents of the yield. We found that: The shorter regeneration period of the between harvests resulted in lower dry matter yields, but also in higher energy concentration and lower ergosterol concentration. The yield and the energy concentration decreased whereas the ADF-ADL and ergosterol concentrations increased with the progress of winter. The fodder harvested in November produced the best results in terms of yield quantity and quality. Thus, in the experiment conducted in Festuca arundinacea stands, the highest yield and energy values were gained by harvesting in November, regardless of pre-utilisation. Despite the cold and the long-lasting snow cover, the energy values of the samples harvested in December and January showed no significant decrease. Regarding fodder quantity and quality, the weather conditions were more important than the frequency and time of harvesting Thus, under continental climate, i.e. in places like Hungary, extensive utilisation, until the end of November or the beginning of December, is recommended.