Varighed i nordlige sorter of Poa pratensis

H÷fundur┌tgefandi┌tgßfußr┌tgßfusta­ur
┴slaug HelgadˇttirRannsˇknastofnun landb˙na­arins, B˙na­arfÚlag ═slands, BŠndaskˇlinn ß Hvanneyri, Rannsˇknast÷­ SkˇgrŠktar rÝkisins, Tilraunast÷­ hßskˇlans Ý meinafrŠ­i, Vei­imßlastofnun1989109-113
Rit┴rgangurT÷lubla­Bls.
B˙vÝsindi2109-113

gr-buv2-ah.PDF

Frß vefstjˇra: Greinina Ý heild sinni er a­ finna Ý pdf-skjalinu hÚr a­ ofan

SAMMENDRAG

Som et led i fŠlles forŠdlingsprojekt for foderplanter i den nordlige del af Skandinavien og i Island (NordgrŠs), blev en serie af sortsforsog med Poa pratensis (eng-rapgrŠs) startet i disse omrßder i ßrene 1982-1984. Der var op til 14 sorter indkluderet i hvert fors°g. I de fleste af fors°gene fik planterne en dňrlig start og parcellerne blev mere eller mindre skadet enten pß grund af ringe planteetablering, eller i vinteren pß grund af svampeangreb eller langvarig isdŠkke. En statistisk analyse af grŠssorternes plantedŠkning giver anledning til at tro at skaderne er meget stedspecifikke. Dette var isŠr tydeligt i fors°gene hvor planteetableringen var dßrlig. Analyserne tyder ogsß pß at de islandske sorter er mere f°lsomme for sneskimmel end de andre sorter.

ABSTRACT

Persistence of northern varieties of Poa pratensis

As a part of a joint breeding project for herbage species in Northern Scandinavia and Iceland, Nordgrass, a series of variety trials were established at various experimental sites in these regions in 1982 to 1984. There were up to 14 varieties included. In most of the experiments the plots were, damaged to a greater or lesser degree, either by poor establishment, infestation by snow mould fungi or by ice encasement. An analysis of the cover of the sown varieties in the experimental plots indicates that the damage inflicted in each experiment is highly site specific, which means that it is difficult to predict which varieties will suffer during stress. This was particularly true in experiments where establishment was poor. However, there were some indications that the Icelandic varieties were more susceptible to snow mould fungi than the other varieties.

Key words: breeding, Poa pratensis, winter hardiness.

YFIRLIT

Ending norrŠnna stofna af vallarsveifgrasi

═ sameiginlegu kynbˇtaverkefni fˇ­urjurta ß nor­urhjara voru ß ßrunum 1982-1984 hafnar stofnatilraunir me­ vallarsveifgras ß 12 tilraunast÷­vum. ═ hverri tilraun voru allt a­ 14 stofnar. ═ m÷rgum tilraunanna ■Úttist sß­gresi­ illa og sums sta­ar skemmdist ■a­ vegna rotkals e­a svellkals. Par sem t÷lfrŠ­ilegt uppgj÷r ß ■ekju grasstofnanna bendir til a­ skemmdirnar sÚu mj÷g mismunandi eftir st÷­um, er erfitt a­ segja fyrir um hva­a stofn skemmist vi­ ßlag. Ůetta ß sÚrstaklega vi­ tilraunir ■ar sem sß­gresi ■Úttist illa Ý upphafi. Samt sem ß­ur vir­ast Ýslenskir stofnar mˇttŠkilegri fyrir rotkali en a­rir.