Suma toplinskih jedinica potrebna za nicanje različitih populacija korovne vrste Abutilon Theophrasti Med

master's thesis

• Author: Ivan Kovačić
• Mentor: Maja Šćepanović (mentor)
• Committee member: Maja Šćepanović (predsjednik povjerenstva)
• Committee member: Klara Barić (član povjerenstva)
• Committee member: Dubravka Dujmović Purgar (član povjerenstva)
• Granter: University of Zagreb; Faculty of Agriculture; (Herbology); Zagreb
• Defense date and country: 2016-07-07, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Agronomy

Abstract

Toplina je jedan od glavnih čimbenika potrebnih za nicanje biljnih vrsta. Sumiranjem efektivnih temperatura (TJ) moguće je utvrditi početak i dinamiku nicanja korovnih vrsta što se koristi kod kreiranja prognoznih modela nicanja. Većina korovnih vrsta ima inter-populacijsku varijabilnost koja se očituje u različitom stupnju dormantnosti, klijanju i nicanju između različitih populacija iste korovne vrste. Postojanje inter-populacijske varijabilnosti može otežati interpolaciju stranih prognoznih modela u naše proizvodno područje. Cilj ovog istraživanja bio je poljskim pokusom usporediti nicanje hrvatskih populacija korovne vrste Abutilon theophrasti s 11 populacija ove vrste iz devet država Europe i SAD-a. Za svaku istraživanu populaciju cilj je bio utvrditi sumu toplinskih jedinica zraka i tla potrebnu za početak i duljinu trajanja nicanja. Pokus je postavljen u jesen 2013. godine na pokušalištu Maksimir Agronomskog fakulteta u Zagrebu. Shema pokusa je bila slučajni blokni raspored u 4 ponavljanja. Rezultati istraživanja ukazuju na postojanje varijabilnosti između istraživanih populacija korovne vrste Abutilon theophrasti. Najmanja suma toplinskih jedinica (415,15 toplinskih jedinica) potrebna za ponik 50% posijanih sjemenki utvrđena je kod američkih (Iowa, Minnesota) populacija te također i kod populacije iz Hrvatske. Utvrđena je signifikantna razlika potrebne sume tolinskih jedinica kod hrvatske i portugalske populacije gdje su populaciji iz Hrvatske za ponik bile potrebne 272,8 toplinske jedinice, dok je najsporije nicajućoj populaciji iz Portugala bila potrebna suma 382,1 toplinske jedinice.

Abstract (english)

Warmth is one of the main factor driving germination and emergence processes. It is possible to determine the beginning and dynamic of emergence of weed species by summarizing growing degree days (GDD), which is used with the development of predictive emrgence models. Most of the weed species is characterized by inter-population variability which is manifested through different stages of dormancy, germination and weed emergence among different populations of the same weed species. Inter-population variability makes interpolation of foreign modeling weed emergence difficult for our agricultural domain. The aim of this study was to compare the emergence of Croatian population of the weed Abutilon theophrasti with 11 populations of this species from nine European countries and the United States by doing the field trial. For each studied population objective was to determine the growing deegre days for air and soil units needed for beginning and duration of germination. The experiment was set up in the fall of 2013 at Maksimir experimental station of Faculty of Agriculture Zagreb. The scheme of the experiment was randomized block schedule with 4 repetitions. The results of this study proved the existence of variability among researched populations of weed species Abutilon theophrasti. The lowest growing deegre days required for the 50% of emergence of sown seeds (415.15 GDD) were found in the US (Iowa, Minnesota) populations, as well as in the Croatian population. A significant difference was determined in the growing degree days with the Croatian and Portuguese population, where Croatian population needed 272,8 GD for the first emergence, while the slowest emerging populations of Portugal needed 382,1 GD.

• Keywords: Abutilon Theophrasti; suma toplinskih jedinica; integrirano suzbijanje korova; prognozni modeli nicanja; inter-populacijska varijabilnost
• Keywords (english): Abutilon theophrasti; GDD; integrated weed control; modeling weed emergence; inter-population variability
• Language: croatian
• URN:NBN: urn:nbn:hr:204:245773
• Study programme: Title: Phytomedicine; Study programme type: university; Study level: graduate; Academic / professional title: magistar/ magistra inženjer/inženjerka fitomedicine (magistar/ magistra inženjer/inženjerka fitomedicine)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2016-09-06 10:57:32