Mechri Beligh, Attia Faouzi, Braham Mohamed, Elhadj Salem Ben, Hammami Mohamed
Laboratoire de Biochimie, USCR Spectrométrie de Masse, UR Nutrition et Désordres Métaboliques, Faculté de Médecine, Monastir, Tunisie.
J Environ Manage. 2007 Dec;85(4):1088-93. doi: 10.1016/j.jenvman.2006.11.010. Epub 2007 Jan 2.
Olive mill wastewater (OMW), a by-product of the olive-mill industry, is produced in large amounts in Mediterranean countries. The presence of indigenous phosphate deposits in some countries like Tunisia provides an incentive for direct application or local chemical treatment at low cost to improve the solubility of low reactive phosphate rocks (PRs). The use of naturally occurring low-molecular weight organic acids (LMWOAs) that are present in OMW represents a new perspective in PR research and a possible solution for the recycling of the OMW. The present work was aimed at evaluating, under natural situations (field of olive trees), the effects of agronomic application of OMW (amounts applied: 30, 60 m(3) ha(-1)) with PR (amounts applied: 150 kg ha(-1)) on olive trees soil properties. We measured organic C, nitrogen (N), extractable phosphorus (P), exchangeable calcium (Ca), and exchangeable potassium (K), as well as other properties (pH and electrical conductivity). Our data provide evidence that agronomic application of OMW with PR has important effects on soil properties. Increases in organic C, total N, extractable P and exchangeable potassium (K) were found after the first agronomic application of OMW and PR. These increases were only temporary, following the second agronomic application of OMW and PR, significant reductions were detected in the extractable soil P (19.67 mg kg(-1) in the control soil vs. 8.99 mg kg(-1) in the amended soil). Changes in the extractable soil P could alter plant productivity and plant community structure because shifts in nutriment availability can affect the balance between limiting and non-limiting nutrients.
橄榄油厂废水（OMW）是橄榄油生产行业的副产品，在地中海国家大量产生。在突尼斯等一些国家，本土磷矿的存在促使人们以低成本直接施用或进行本地化学处理，以提高低活性磷矿石（PRs）的溶解度。利用OMW中天然存在的低分子量有机酸（LMWOAs）是PR研究的一个新视角，也是OMW循环利用的一种可能解决方案。本研究旨在评估在自然条件下（橄榄树种植地），将OMW（施用量：30、60立方米·公顷⁻¹）与PR（施用量：150千克·公顷⁻¹）进行农艺施用对橄榄树土壤性质的影响。我们测量了有机碳、氮（N）可提取磷（P）、交换性钙（Ca）和交换性钾（K），以及其他性质（pH值和电导率）。我们的数据表明，将OMW与PR进行农艺施用对土壤性质有重要影响。在首次将OMW与PR进行农艺施用后，发现有机碳、总氮、可提取磷和交换性钾（K）有所增加。这些增加只是暂时现象，在第二次将OMW与PR进行农艺施用后，土壤中可提取磷显著减少（对照土壤中为19.67毫克·千克⁻¹，改良土壤中为8.99毫克·千克⁻¹）。土壤中可提取磷的变化可能会改变植物生产力和植物群落结构，因为养分有效性的变化会影响限制养分和非限制养分之间的平衡。
