Pošlji prispevek (e-pošta) Hladni stres na razvojni stopnji sejanke navadne ajde optimizira razvoj korenin in nadzemne biomase in omejuje prekomerno vegetativno rast, ki zavira tvorbo semen (analitični pregled)
Povzetek
Navadna ajda, posejana v topla tla hitro vzkali in hitro raste in uspešno tekmuje z enoletnimi pleveli.Vendar pa takšna agronomska praksa ne vodi vedno k dobremu pridelku zrnja, ker daje močno in obilno cvetenje ajde pogosto le minimalno količino semen zaradi pomanjkanja vode v zgornjih plasteh tal v času cvetenja. To obnašanje ajde je opisano kot “pretirana rast (s šibko tvorbo semen).Ta pojav povzroča relativna šibkost koreninskega sistema te vrste, katerega posebnost je zelo hiter prehod k tvorbi sekundarnih korenin, kar daje prednost v začetnem razvoju, a omejuje rast korenin kasneje. Cvetenje navadne ajde je časovno raztegnjeno. Prva polovica tega razvojnega obdobja, ki je najpomembnejša za pridelek zrnja soupada z najmočnejšo vegetativno rastjo. Znižanje temperature na razvojni stopnji sejanke upočasni rast nadzemnega dela in pospeši rast korenin, kar v kasnejših fazah razvoja ugodno vpliva na razmere za razvoj semen in s tem na pridelek zrnja. To razloži zakaj je zgodnja setev navadne ajde ugodna za pridelek zrnja.
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DOI: http://dx.doi.org/10.14720/aas.2020.116.1.1648
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