scholarly journals The long term effect of Olive Mill Wastewater (OMW) on organic matter humification in a semi-arid soil

Heliyon ◽  
2020 ◽  
Vol 6 (1) ◽  
pp. e03181 ◽  
Author(s):  
Fatima Zahra El Hassani ◽  
Abdelali Fadile ◽  
Mouna Faouzi ◽  
Abdelah Zinedine ◽  
Mohamed Merzouki ◽  
...  
Keyword(s):  
Organic Matter ◽  
Olive Mill Wastewater ◽  
Term Effect ◽  
Arid Soil ◽  
Long Term Effect ◽  
Semi Arid ◽  
Olive Mill

Change and spatial variability of soil organic matter humification after long-term tillage and olive mill wastewater application in arid regions

Soil Research ◽  
2020 ◽  
Vol 58 (4) ◽  
pp. 388
Author(s):  
Hadda Ben Mbarek ◽  
Kamel Gargouri ◽  
Chaker Mbadra ◽  
Rayda Chaker ◽  
Yousra Souidi ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Management Practices ◽  
Fluorescence Emission ◽  
Olive Mill Wastewater ◽  
Emission Area ◽  
Humification Degree ◽  
Uv Visible ◽  
Olive Mill

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.

Long-term effect of a simple storage protocol on fluorescence fingerprint of dissolved organic matter

2015 ◽  
Vol 16 (1) ◽  
pp. 44-51 ◽  
Author(s):  
Xuechun Wang ◽  
Hao Chen ◽  
Kun Lei ◽  
Zhong Sun
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Model Development ◽  
Term Effect ◽  
Parafac Model ◽  
Long Term Effect ◽  
Simple Protocol ◽  
Long Time ◽  
Parallel Factor

Fitting a pre-established region-specific Parallel Factor Analysis (PARAFAC) model to new dissolved organic matter (DOM) samples has become a popular approach in DOM studies. A key step during the development of the pre-established model is to identify the fluorescence fingerprint, i.e. the number of fluorescent DOM (FDOM) components as well as their excitation and emission spectral features. In practice the samples to use for model development may not be measured immediately after sampling and will instead be stored for a relatively long time, thus raising the question whether the storage would change the intrinsic fingerprints. In this study, two PARAFAC models were separately developed and validated for the same set of surface water DOM samples from an estuary and its river, immediately after sampling and after 9-month storage respectively. The fingerprint did not change after storage, regardless of the change of the intensity of some components. The findings in this study highlighted that DOM samples stored using a simple protocol (i.e. filtration to 0.45 μm pore size without any preservatives and placed at 4 °C in the dark under airtight conditions) for a few months would not change fluorescence fingerprints for PARAFAC and broaden our understanding of the application of PARAFAC to DOM studies.

scholarly journals Long-term effect of no-tillage on soil organic matter fractions in rainfed Aragon (NE Spain) .

2014 ◽  
Vol 1 ◽  
Author(s):  
Nuria Blanco-Moure ◽  
Ana Bielsa ◽  
Ricardo Gracia ◽  
María Victoria López
Keyword(s):  
Organic Matter ◽  
Particulate Organic Matter ◽  
Agricultural Soils ◽  
Soil Surface ◽  
Term Effect ◽  
No Tillage ◽  
Long Term Effect ◽  
Organic Matter Fractions ◽  
Ne Spain

This paper assesses the long-term effect of no-tillage (NT) on soil organic carbon (OC) content and its distribution among different organic matter fractions in rainfed agrosystems of Aragón (NE Spain). Adjacent fields of NT, conventional tillage (CT) and natural soils (NAT) were compared in three different cereal production areas. In the soil surface, the higher OC content found in the NAT soils was due to the particulate organic matter. In the case of agricultural soils, in general, the fractions responsible for the OC increase under NT were the fine particulate organic matter and the mineral-associated organic matter occluded within stable microaggregates.

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