Change and spatial variability of soil organic matter humification after long-term tillage and olive mill wastewater application in arid regions
Hadda Ben Mbarek A , Kamel Gargouri
B D , Chaker Mbadra A , Rayda Chaker B , Yousra Souidi A , Ouissam Abbas C , Vincent Baeten C and Hafedh Rigane A
+ Author Affiliations
- Author Affiliations
A Sfax Faculty of Science, Earth Sciences Department, University of Sfax, PO Box 1087, 3000 Sfax, Tunisia.
B Olive Institute, University of Sfax, PO Box 1087, 3000 Sfax, Tunisia.
C Walloon Agricultural Research Centre (CRA-W), Food and Feed Quality Unit, Henseval Building, 24 Chaussée de Namur, 5030 Gembloux, Belgium.
D Corresponding author. Email: kamel.gargouri@iresa.agrinet.tn
Soil Research 58(4) 388-399 https://doi.org/10.1071/SR19113
Submitted: 8 May 2019 Accepted: 20 December 2019 Published: 3 March 2020
Abstract
The changes of soil organic matter (SOM) humification induced by long-term combination of tillage and olive mill wastewater (OMW) application compared to natural and cultivated soil have been little investigated. This study aimed to compare effects of no cultivation with natural vegetation soil (NC), tillage (CT1) for 80 years and combination of tillage with OMW application (CT2) for 20 years on SOM humification degree. Fluorescence spectroscopy and UV-visible ratios (E4/E6 and CHA/CFA) were used to study soil humic acids (HAs). The SOM and humification distribution was determined for the whole field area using the Inverse Distance Weighting method. Results showed that SOM content, fluorescence emission area and E4/E6 and CHA/CFA ratios were higher in NC. Tillage reduced SOM amount, molecular size, aromatic condensation and humification degree as shown by the strong correlation between fluorescence area and CHA/CFA ratio in CT1 conversely to E4/E6. Contradictory results between fluorescence emission area and E4/E6 ratio found in NC and CT1 indicated that E4/E6 ratio was not a reliable indicator of SOM humification degree. The SOM amount, CHA/CFA ratio and emission fluorescence area increased conversely to E4/E6 ratio in CT2. This revealed a greatly humified organic matter and aromatic structure condensation with tillage and OMW application. Spatial distribution showed a progressive increase of SOM and CHA/CFA from north-west to south-east linked to the positive relationship between CHA/CFA ratio and SOM amount independent of soil management practices. Soil amended with OMW provided a favourable environment for the development of HAs which improved soil quality. The UV-visible ratio CHA/CFA with fluorescence emission area can be used as parameters to investigate SOM humification degree.
Additional keywords: aromatic structure, fluorescence spectroscopy, humic acids, organic wastes, UV-visible spectroscopy, SOM.
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