Vertikalna varijabilnost ukupnog sumpora u pseudogleju pri rastućim dozama mineralne dušične gnojidbe

master's thesis

• Title (english): Vertical variability of total sulfor in stagnosol according to increased doses of mineral nitrogen ferilization
• Author: Petar Glumac
• Mentor: Aleksandra Perčin (mentor)
• Committee member: Aleksandra Perčin (predsjednik povjerenstva)
• Committee member: Aleksandra Bensa (član povjerenstva)
• Committee member: Tomislav Karažija (član povjerenstva)
• Granter: University of Zagreb; Faculty of Agriculture; (Department of General Agronomy); Zagreb
• Defense date and country: 2021-07-15, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Agronomy

Abstract

Nedostatak sumpora (S) u tlima postaje sve češći problem u mnogim područjima svijeta kao rezultat različitog načina korištenja tla i agrotehničkih mjera, visokog iznošenja S biomasom, ali i smanjene emisije S u atmosferu. Ako se uzme u obzir da je S uz dušik neizostavan u sintezi proteina, te da adekvatne zalihe S u tlu također doprinose optimalnom prinosu usjeva, poznavanje doprinosa mineralne dušične gnojidbe sadržaju S u tlu od iznimne je važnosti kako bi se mjerama održivog gospodarenja tlom očuvala proizvodna uloga tla. Cilj ovog rada bio je utvrditi vertikalnu varijabilnost ukupnog sumpora u pseudogleju u ovisnosti o rastućim dozama dušične gnojidbe, dubini, reakciji i teksturi tla. Istraživanje je obuhvatilo analizu uzoraka tla prikupljenih u 2007. sa višegodišnjeg poljskog pokusa smještenog u centralnom dijelu RH sa četiri rastuće doze dušične gnojidbe u rasponu od 0-300 kg N/ha. Sumpor je u 128 uzoraka tla utvrđen metodom suhog spaljivanja. Rastuće doze mineralne dušične gnojidbe utjecale su na značajno povećanje sadržaja ukupnog sumpora u tlu do 100 cm dubine. Osobita varijabilnost s obzirom na dušičnu gnojidbu utvrđena je u površinskom sloju tla gdje se sadržaj sumpora kretao u rasponu od 0,0151 % na kontrolnom tretmanu do 0,0373 % na N300 tretmanu, što je razmjerno povećanju za 1,5 puta. Vertikalna raspodjela ukupnog sumpora do dva metra dubine značajno je varirala i njegov sadržaj se smanjivao sa porastom dubine. Sveukupno gledano ovisno o dubini ali i rastućim dozama dušične gnojidbe sadržaj sumpora varirao je od 0,0102 % na N100 tretmanu i dubini 150-175 cm do 0,0373% na N300 tretmanu u površinskom sloju tla (0-25 cm). Između sadržaja ukupnog sumpora i udjela praha i gline utvrđena je značajna i jaka pozitivna korelacija, kao i značajna, jaka i negativna povezanost reakcije tla i ukupnog sumpora. Rezultati u konačnici ukazuju da je na tretmanu sa 300 kg/ha apliciranog dušika u tlu do 2 m dubine bilo pohranjeno 26,1 t/ha ukupnog sumpora.

Abstract (english)

Sulphur (S) deficiency in soils is an increasingly common problem in many parts of the world as a result of different soil management and agronomic measures, high S biomass uptake, but also reduced S emissions from atmosphere. Sulphur along with nitrogen is indispensable in protein synthesis and adequate stocks of S in the soil also contribute to optimal crop yield, so knowledge of the contribution of mineral nitrogen fertilization to the content of S in the soil is very important to maintain soil production role. The aim of this thesis topic was to determine the vertical variability of total sulphur in stagnosol due to increasing doses of nitrogen fertilization, depth, and soil pH and soil texture. The research included the analysis of soil samples collected in 2007 from a long term field experiment located in the central part of Croatia with four increasing doses of nitrogen fertilization in the range of 0-300 kg N/ha. Sulphur was determined by dry incineration in 128 soil samples. Increasing doses of mineral nitrogen fertilization significant increased the total sulphur content in the soil up to 100 cm depth. Particular variability with respect to nitrogen fertilization was found in the surface soil layer where the sulphur content ranged from 0.0151% on the control treatment to 0.0373% on the N300 treatment, which is proportional to the increase of 1.5 times. The vertical distribution of total sulphur up to two meters deep varied significantly and its content decreased with depth. Overall, depending on the depth and doses of nitrogen fertilization, the sulphur content varied from 0.0102% on the N100 treatment on 150-175 cm depth to 0.0373% on the N300 treatment in the surface soil layer (0-25 cm). A significant and strong positive correlation was found between total sulphur and the silt and clay, as well as a significant, strong and negative correlation between the soil pH and total sulphur. The results also indicate that 26.1 t/ha of total sulphur was stored up to 2 meter of depth on N300 treatment.

• Keywords: sumpor; dušična gnojidba; dubina tla; tekstura tla
• Keywords (english): sulphur; nitrogen fertilization; soil depth; soil texture
• Language: croatian
• URN:NBN: urn:nbn:hr:204:800016
• Study programme: Title: Agroecology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/ magistra inženjer/inženjerka agroekologije (magistar/ magistra inženjer/inženjerka agroekologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2021-10-04 10:26:04