Utjecaj uklanjanja organske tvari na rezultat analize mehaničkog sastava odabranih uzoraka tla

master's thesis

• Title (english): Influence of organic matter removal on the results of praticle size distribution analysis in selected soil samples
• Author: Ana-Marija Krajnik
• Mentor: Vedran Rubinić (mentor)
• Committee member: Vedran Rubinić (predsjednik povjerenstva)
• Committee member: Aleksandra Bensa (član povjerenstva)
• Committee member: Vilim Filipović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Agriculture; (Department of Soil Science); Zagreb
• Defense date and country: 2019-09-30, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Agronomy

Abstract

Provedeno je istraživanje utjecaja predtretmana spaljivanjem organske tvari tla (OT) na
rezultate analize mehaničkog sastava tla (MST). U tu svrhu, određen je MST u 20 uzoraka
slabo humoznih tala, i to sa i bez prethodnog spaljivanja OT 30% vodikovim peroksidom. Za
disperziju uzoraka tla na mehaničke elemente, korištena je otopina natrijevog
heksametafosfata i natrijevog karbonata. Statističkom obradom rezultata, utvrđeno je da
postoje značajne razlike u rezultatima analize MST, obzirom na primjenu/izostanak
uklanjanja OT. Međutim, te su razlike u apsolutnom smislu bile male te u pravilu nisu
utjecale na određivanje teksturne klase tla. Stoga, izostavljanje uklanjanja OT iz uzoraka
slabo humoznih tala može biti opravdano ako se ne zahtijeva visoka preciznost analize MST,
nego samo pouzdano određivanje teksturalne klase tla.

Abstract (english)

The effect of soil organic matter (SOM) removal on the results of soil particle size
distribution (PSD) analysis was investigated. Soil PSD was determined in 20 samples
featuring low SOM content, with and without prior removal of SOM with 30% hydrogen
peroxide. For the dispersion of soil samples, solution of sodium hexametaphosphate and
sodium carbonate was used. After statistically processing the results, it was found that there
were significant differences in the results of the PSD analysis, given the application/absence
of SOM removal pre-treatment. However, these differences were small in absolute terms and
generally did not affect the determination of the soil textural class. Thus, omitting SOM
removal in samples with low SOM content may be justified, if it is not the high precision of
PSD analysis that is required, but only the reliable determination of soil textural class.

• Keywords: praškasto ilovasta tla; slabo humozna tla; vodikov peroksid; pipet-metoda analize mehaničkog sastava tla
• Keywords (english): silt loam soils; soils with low organic matter content; hydrogen peroxide; soil particle size distribution analysis by pipette-method
• Language: croatian
• URN:NBN: urn:nbn:hr:204:507065
• Study programme: Title: Agroecology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/ magistra inženjer/inženjerka agroekologija (magistar/ magistra inženjer/inženjerka agroekologija)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Repository: Repository Faculty of Agriculture University of Zagreb
• Created on: 2019-10-09 10:12:47