Vertikalna varijabilnost reakcije tla u pseudogleju pri rastućim dozama mineralne dušične gnojidbe

master's thesis

• Title (english): Vertical variability of soil reactions in stagnosol due to increase doses of mineral nitrogen fertilization
• Author: Luka Crkvenac
• Mentor: Aleksandra Perčin (mentor)
• Committee member: Aleksandra Perčin (predsjednik povjerenstva)
• Committee member: Aleksandra Bensa (član povjerenstva)
• Committee member: Ivana Šestak (član povjerenstva)
• Granter: University of Zagreb; Faculty of Agriculture; (Department of General Agronomy); Zagreb
• Defense date and country: 2019-09-30, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Agronomy

Abstract

Rezultati mnogobrojnih znanstvenih istraživanja ukazuju da dugogodišnja mineralna dušična gnojidba uzrokuje zakiseljavanje tla. Poznavanje pojedinih doprinosa na zakiseljavanje tla od iznimne je važnosti kako bi se mjerama održivog gospodarenja tlom očuvala proizvodna uloga tla. Cilj rada bio je utvrditi utjecaj dubine tla, rastućih doza dušične gnojidbe, teksture tla kao i sadržaja iona kalcija i magnezija na vertikalnu varijabilnost reakcije tla u pseudogleju. Istraživanje je obuhvatilo analizu uzoraka tla prikupljenih do dva metra dubine u 2007. i 2008. godini sa višegodišnjeg poljskog pokusa smještenog u centralnom dijelu RH sa četiri rastuća gnojidbena tretmana u rasponu od 0-300 kg N/ha. Rezultati ukazuju da su rastuće doze mineralne dušične gnojidbe utjecale na značajno zakiseljavanje tla i u 2007. i 2008. godini u profilu do 50 cm dubine. Tako je u površinskom sloju tla u 2007. godini primjena 200 kg N/ha doprinijela smanjenju reakcije tla za 1,5 pH jedinicu, a primjena 300 kg N/ha u 2008. godini smanjenju reakcije tla za 0,7 pH jedinica. Utvrđen je i značajan utjecaj dubine profila tla na povećanje reakcije tla koje je bilo uvjetovano ispiranjem slobodnih karbonata u dublje slojeve tla. Smanjenjem sadržaja gline, praha i krupnog pijeska reakcija tla je rasla te je bila u jakoj i pozitivnoj korelaciji sa sadržajem istraživanih kationa (pH vs Ca2+, r = 0,661; pH vs Mg2+, r = 0,691).

Abstract (english)

The results of numerous scientific studies indicate that long-term mineral nitrogen fertilization caused soil acidification. Knowledge of impact of individual contributors to the soil acidification is very important in order to maintain soil productive function through sustainable management practice. The aim of this thesis was to determine the influence of soil depth, increasing doses of nitrogen fertilization, soil texture and content of calcium and magnesium ions on the vertical variability of soil reaction in Stagnosols. The study included analysis of soil samples collected up to two meters depth in 2007 and 2008 from long-term experimental field located central part of Croatia with four nitrogen treatments in the range of 0-300 kg N/ha. The results indicate that increasing doses of applied nitrogen significantly influenced on soil acidification up to 50 cm depth in 2007 and 2008. In surface soil layer in 2007, the application of 200 kg N/ha contributed to reduction of soil reaction for 1.5 pH units, and the application of 300 kg N/ha in 2008 reduced the soil reaction for 0.7 pH units.
Also, significant influence of soil depth was recorded. Soil reaction increased significantly with increase soil depth due to carbonate leaching in dipper soil layers. The decrement of clay, silt and sand content increase soil reaction which was in the strong and positive correlation with the content of the investigated cations (pH vs Ca2 +, r = 0.661; pH vs Mg2 +, r = 0.691).

• Keywords: tlo; zakiseljavanje; kalcij; magnezij; tekstura tla
• Keywords (english): soil; acidification; calcium; magnesium; soil texture
• Language: croatian
• URN:NBN: urn:nbn:hr:204:611072
• 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: Open access; Embargo expiration date: 2020-05-30
• Created on: 2019-11-30 08:29:00