Abstract
A remarkable decrease in olive production has been observed in Tunisia since 2000, particularly in the semi-arid region. This downfall was mainly due to a notable change in climatic conditions as a result of wind erosion and over cultivation. The aim of this work was to study the biological, physical, and chemical properties of several semi-arid soils from olive tree fields subjected to different farming practices, such as crop time and type of crop, olive mill wastewater (OMW) application rates, and tillage timing and depth (deep or conventional plowing). We noted that hydraulic conductivity (HC) was proportional to the age of the soil tillage, and the highest values were recorded in the soil cultivated for 100 years, with an average value of 33.05 ± 0.02 mm h−1. An important increment of the iron soil content was observed, especially after the fig tree introduction among the olive trees (12,094 ng μL−1) in 2007. Also, a significant increase of the organic matter (OM) content (up to2.6 mg-OM/g-soil) was identified in soil treated with OMW compared to the lowest OM content (0.83 mg-OM/g-soil) recorded in the soil cultivated since 1901. The bacterial communities of the different soils were characterized by 454 pyrosequencing technology, and showed an important diversity, mainly corresponding to Proteobacteria, Actinobacteria, and Acidobacteria. Many operational taxonomic units (OTUs) are raretons, indicating a high resilience of the soil bacterial communities. Statistical analyses showed significant correlations with the different soil parameters. However, an unexpected correlation was determined between soil respiration and OM (r = − 0.583*), suggesting that OM increases the retention of CO2, a greenhouse gas. The farming techniques analyzed in this study resulted in a reduction of the bacterial diversity, even though the total bacterial biomass augmented.
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Acknowledgments
We are very thankful to Ana I. Morato (Department of Molecular Biology, Universidad Autonoma de Madrid, Spain) for providing her skillful technical assistance. The authors would like to thank Esther Ruiz-Uceda for her valuable review of the spelling and grammar of the manuscript.
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This work was supported by grants from the Tunisian Ministry of Agriculture and Water Resources, and by the International Fund for Agricultural Development (IFAD).
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Rajhi, H., Sanz, J.L., Abichou, M. et al. The Impact of Different Techniques of Soil Management on Soil Fertility and the Associated Bacterial Communities in Semi-arid Olive Tree Fields. J Soil Sci Plant Nutr 21, 547–558 (2021). https://doi.org/10.1007/s42729-020-00382-z
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DOI: https://doi.org/10.1007/s42729-020-00382-z