Pošlji prispevek (e-pošta) Uvajanje najboljših kriterijev za ovrednotenje tolerance na sušo pri genotipih sirka
Povzetek
Navadni sirek (Sorghum bicolor (L.) Moench) je peto najpomembnejše na sušo odporno žito, a se kljub temu njegov pridelek zrnja znantno zmanjša ob pomanjkanju vode. V tej raziskavi je bilo ocenjenih 10 genotipov navadnega sirka glede na pridelek zrnja ob normalnem namakanju in v razmerah vodnega deficita. Ocenjeni so bili tudi različni indeksi tolerance na sušo pri izboru genotipov z velikimi pridelki zrnja in dobre tolerance na sušo. Poskus je bil izveden kot puskus z deljenkami, kjer so bila obravnavanja z namakanjem na glavnih ploskvah in 10 genotipov na podploskvah. Uporabljene so bile korelacije med indeksi in združevanje genotipov glede na glavno komponento. Velikost pridelka je bila značilno pozitivno povezana z indeksi MP (poprečna produktivnost), STI (indeks tolerance na stres), GMP (geometrična produktivnost), HM (harmonično poprečje) in YI (indeks pridelka) pri vseh načinih namakanja. Ti indeksi so torej bolj učinkoviti pri izboru visoko donosnih genotipov v razmerah različne preskrbe z vodo. Poprečje rangov stresnih indeksov za vsak genotip je odkrilo, da je genotip TN-04-79 najučinkoviteši ob blagem pomanjkanju vode, genotipa KGS23 in TN-04-79 pa sta bila najbolj odporna na sušo.
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DOI: http://dx.doi.org/10.14720/aas.2021.117.4.2176
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