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The study aimed to determine the effect of different slope positions on selected chemical properties of Pseudogley in the vineyard. The study was conducted in Zagreb, central Croatia. A total of 15 top-soil samples (0-30 cm) were collected from a hilltop, backslope, and footslope and analysed for pH, hydrolytic acidity (Hy), soil organic carbon (SOC) content, P2 O5 , K2 O, and potentially toxic elements (As, Cu, Ni, Pb, and Zn). A slight increase in mean pH value from the hilltop to the footslope and a decrease in Hy were observed, although differences were not statistically significant. The SOC content was low and uniform along the entire slope. A significantly higher concentration of P2 O5 at the footslope compared to the hilltop was established (10.4 and 3.4 mg/100 g of soil, respectively). The K2 O concentration at the footslope (29.7 mg/100 g of soil) was significantly higher than at the backslope (21.2 mg/100 g of soil). The Cu, Pb, and Zn concentrations were significantly affected by slope positions in terms of download accumulation. The studied soil was contaminated by As, Ni, and Zn at the hilltop and the footslope and partly at the backslope, according to the Ordinance on the Protection of Agricultural Land from Pollution. The Cu concentrations exceeded the maximum allowed concentrations only on the backslope and footslope. The minor differences in studied soil properties between slope positions can be attributed to a short length, low and uneven inclination, and relatively short-term anthropogenic influence., Cilj istraživanja bio je utvrditi utjecaj različitog položaja na obronku na odabrana kemijska svojstva pseudogleja u vinogradu. Istraživanje je provedeno u Zagrebu, centralna Hrvatska. Ukupno je uzorkovano 15 uzoraka površinskog horizonta tla (0-30 cm) sa gornjeg, srednjeg i donjeg dijela obronka i analizirano na pH, hidrolitski aciditet (Hy), sadržaj organskog ugljika tla, P2 O5 , K2 O i potencijalno toksične elemente (As, Cu, Ni, Pb i Zn). Uočeno je blago povećanje prosječne pH vrijednosti i snižavanje Hy od vrha prema dnu obronka, iako razlike nisu bile statistički opravdane. Sadržaj organskog ugljika je bio nizak i uniforman duž cijelog obronka. Ustanovljene su signifikantno više koncentracije P2 O5 na dnu u usporedbi s vrhom obronka (10.4 i 3.4 mg/100 g tla). Koncentracije K2 O bile su značajno više na dnu (29.7 mg/100 g tla) u odnosu na sredinu obronka (21.2 mg/100 g tla). Koncentracije Cu, Pb i Zn bile su pod značajnim utjecajem položaja na obronku u smislu nakupljanja na dnu. Istraživano tlo bilo je onečišćeno s As, Ni i Zn na vrhu i dnu, te djelomično na sredini obronka prema Pravilniku o zaštiti poljoprivrednog zemljišta od onečišćenja. Koncentracije bakra prešle su maksimalno dozvoljene koncentracije samo na sredini i dnu padine. Male razlike u istraživanim svojstvima tla između dijelova obronka mogu se pripisati kratkoj dužini obronka, malom i neujednačenom nagibu te relativno kratkotrajnom antropogenom utjecaju.

The paper aimed to determine humus quality in Terra rossa soils under olive groves with different soil management types. A total of 10 top-soil samples (0-20 cm) were collected in olive groves of Middle Dalmatia, Croatia, out of which 5 were from the traditional low-input olive groves (TOG) and 5 in the intensive olive groves (IOG). The soil samples were analyzed for basic soil properties, soil organic carbon (SOC), and fractional composition of humic substances. Spectroscopic characterization of humic substances was carried out by measuring absorbance in the VIS spectral range (400-700 nm). Optical index E4/E6 (ratio of optical absorbance at 465 to 665 nm for humic substances in solution) was calculated. The mean value of SOC in soils under TOG (3.06%) was lower than in soils under IOG (3.88%). Higher variations of carbon in humic (CHA) and fulvic acid (CFA) were observed in the soils under IOG. The mean CHA/CFA ratio in soils under TOG was higher than in soils of IOG (1.78 and 1.26, respectively). The soils under TOG had fulvic-humic to humic types, while the soils of IOG had humic-fulvic to humic types of humus. A lower mean E4/E6 index of soils under TOG than IOG (3.78 and 4.36, respectively) confirmed the results of the classical analytical method. Our findings reveal higher variation and lower humus quality in soils under intensive olive cultivation., Cilj rada bio je utvrditi kvalitetu humusa u crvenicama pod maslinicima s različitim načinom gospodarenja tlom. Ukupno je uzeto 10 površinskih uzoraka tla (0-20 cm) iz maslinika Srednje Dalmacije, Hrvatska, od čega 5 iz tradicionalnih maslinika (TM) i 5 iz intenzivnih maslinika (IM). Uzorci tla su analizirani na osnovna svojstva tla, organski ugljik (OC) i frakcijski sastav humusnih supstanci. Spektroskopska karakterizacija humusnih supstanci provedena je mjerenjem absorbance u VIS spektralnom rasponu (400-700 nm). Izračunat je optički indeks E4/E6 (odnos optičke apsorbance kod 465 prema 665 nm za humusne supstance u otopini tla). Srednja vrijednost OC u tlima pod TM (3,06%) bila je niža nego u tlima pod IM (3,88%). Veća variranja ugljika u huminskim (CHA) i fulvo (CFA) kiselinama uočena su u tlima pod IM. Prosječni CHA/CFA odnos u tlima pod TM (1,78) bio je viši nego u tlima pod IM (1,26). Tla pod TM imala su fulvično-huminski do huminski tip, dok su tla pod IM imala huminsko-fulvični do huminski tip humusa. Niža srednja vrijednost E4/E6 indeksa u tlima pod TM (3,78) u odnosu na IM (4,36) potvrdila je rezultate klasične analitičke metode. Naši rezultati otkrivaju veće variranje i nižu kvalitetu humusa u tlima pod intenzivnom maslinarskom proizvodnjom.