Search

Your search keyword '"e4/e6 index"' showing total 3 results
Start Over Descriptor "e4/e6 index" Search Limiters Full Text
3 results on '"e4/e6 index"'

1. Humus quality in Terrra rossa soils under olive groves with different soil management types

Author

Aleksandra BENSA, Fran HULJEV, and Nikolina JURKOVIĆ BALOG

Subjects
dalmatia, e4/e6 index, fulvic acid, humic acid, vis spectroscopy, Agriculture
Abstract

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.

Published
2023
Full Text
View/download PDF

2. Humus quality in Terrra rossa soils under olive groves with different soil management types.

Author

BENSA, Aleksandra, HULJEV, Fran, and JURKOVIĆ BALOG, Nikolina

Subjects
SOIL management, SOIL classification, HUMUS, SOILS, OLIVE
Abstract

Copyright of Journal of Central European Agriculture is the property of Journal of Central European Agriculture and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2023
Full Text
View/download PDF

3. Humus composition of Terra rossa under olive groves in dependence of soil management

Author

Huljev, Fran and Bensa, Aleksandra

Subjects
E4/E6 indeks, traditional cultivation, intensive cultivation, intenzivni uzgoj, E4/E6 index, ekstenzivni uzgoj, BIOTEHNIČKE ZNANOSTI. Poljoprivreda (agronomija), Ch/Cf odnos, Ch/Cf ratio, BIOTECHNICAL SCIENCES. Agronomy
Abstract

Cilj rada bio je utvrditi utjecaj sustava uzgoja u maslinarstvu (ekstenzivni i intenzivni uzgoj) na sastav humusa crvenica. Istraživanje je provedeno na 10 prosječnih uzoraka tla (0-20 cm) od čega 5 u maslinicima s ekstenzivnim, a 5 s intenzivnim uzgojem maslina, na području srednje Dalmacije. U uzorcima je određen frakcijski sastav humusnih tvari, spektroskopski su karakterizirani, te je izračunat optički indeks E4/6. Srednja vrijednost sadržaja humusa bila je viša u intenzivnim maslinicima (6,7 %) nego u ekstenzivnim (5,3 %). Prosječan omjer huminskih i fulvo kiselina (Ch/Cf) u tlima ekstenzivnih maslinika (1,78) bio je viši nego kod intenzivnih (1,26), što upućuje na prosječno bolju kvalitetu humusa. Međutim, u dva uzorka intenzivnih maslinika također je utvrđen najkvalitetniji tip humusa (Ch/Cf > 1,5). Niži prosječan E4/E6 indeks u tlima ekstenzivnih maslinika (3,86) u odnosu na intenzivne (4,63) potvrdio je rezultate klasične analitičke metode. Pri intenzivnom uzgoju maslina kvaliteta humusa je više varirala i bila prosječno niža. The aim of this study was to determine the influence of the cultivation system in olive growing (extensive and intensive) on the humus composition of Terra rossa. The study was conducted on 10 average soil samples (0-20 cm) out of which 5 in olive groves with extensive and 5 with intensive olive cultivation, in middle Dalmatia. Soil samples were analysed for fractional humus composition, spectroscopically characterized and optical index E4/E6 was deteremined. The mean value of humus content was higher in intensive olive groves (6.7 %) in comparison to extensive (5.3 %). The mean value of humic to fulvic acid ratio (Ch/Cf) in the soils of extensive olive groves (1.78) was higher than in intensive olive groves (1.26), which indicates an averagely higher humus quality. However, in two samples of intensive olive groves the highest humus quality was also determined (Ch/Cf > 1.5). Lower mean E4/E6 indeks in soils of extensive olive groves (3.86) in relation to intensive (4.63) confirmed results of classical analytical method. The humus quality in soils under intensive olive groving varied more and in average was lower.

Published
2022

Catalog

Books, media, physical & digital resources
See catalog results