Abstract
Plant cover modifies the physicochemical properties of the soil surface, which results in an enrichment in organic matter and a greater infiltration. So, this study was conducted to determine if its establishment in olive groves was effective, compared to conventional tillage, for the reduction in pollution by soluble phosphorus (P). Surface runoff, soluble P and Olsen P losses in sediment were analyzed in three experiment fields of ecological olive trees in the province of Córdoba (Spain), from 1 June 2003 to 1 June 2005. The cover system reduced the total losses of both variables in the three plots (between 7.6% and 36.5% the dissolved P loss and between 16.3% and 56.4% that of the runoff), with a certain parallelism being observed in the time distribution of the losses in both soil management systems, with significant Spearman coefficients of correlation, ranging between 0.60 and 0.98. Over half the losses of the runoff and dissolved P were produced in two or three events for the two management systems. The establishment of plant cover altered the relative composition in the Olsen P loss (raising the proportion of soluble P) and usually increased the dissolved P rate. Finally, and although it is a positive technique and highly recommendable in the area’s olive groves, it was not completely effective in controlling water pollution in relation to the soluble P concentration, since this was over 0.11 mg l−1 in all the cases with a cover.
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Abbreviations
- TDP:
-
total dissolved P
- DRP:
-
dissolved reactive P (RP<0.45 μm)
- CT:
-
conventional tillage
- PC:
-
plant cover
- CV:
-
coefficient of variation
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Acknowledgments
Our thanks to the Specific Agreement between the Department of Agriculture and Fisheries of the Autonomous Government of Andalusia and the AEAC/SV’s “Development of a Follow-up Programme for the Evaluation of the Application of Measures to Promote Plant Covers in Andalusian Olive Groves”, which financed the studies, as well as to the agreement CC06-132 between IFAPA and the AEAC/SV´s; to the scientific committee of the Agreement; to the laboratory staff for their help in performing the analyses, and to the owners of the different land plots for permitting the carrying out of the experiments.
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Rodríguez-Lizana, A., Ordóñez, R., Espejo-Pérez, A.J. et al. Plant Cover and Control of Diffuse Pollution from P in Olive Groves. Water Air Soil Pollut 181, 17–34 (2007). https://doi.org/10.1007/s11270-006-9273-0
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DOI: https://doi.org/10.1007/s11270-006-9273-0