The use of natural organic correctives is a current agricultural practice that may have advantages for the production of plants in contaminated soils. Cork powder is a natural sub-product of the cork industry that has several potential benefits compared to more commonly used soil amendments. In this work, an evaluation was performed of the use of cork powder (a non-conventional organic residue) and horse manure (traditionally used in agriculture) to control the availability of potentially toxic elements in artificially contaminated soils. Four concentrations were used for each element: Cr (100 to 800 mg kg⁻¹), Ni (37.5 to 300 mg kg⁻¹), Zn (150 to 1200 mg kg⁻¹), Cd (1.5 to 12 mg kg⁻¹) and Pb (150 to 1200 mg kg⁻¹). The accumulation of these elements in lettuce plants grown in pots under controlled conditions was evaluated. With the exception of Cd, no significant differences were detected in the absorption of the different elements by lettuce plants at the studied amounts of correctives applied (1% for cork powder and 0.5% for horse manure). Cadmium was the element that accumulated most in lettuce. Cork powder was shown to be less effective than horse manure in controlling the bioavailability of these elements in the soil. Further tests with chemically modified cork products could improve its efficiency.

中文翻译：

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传统（马粪）和非传统（软木粉）有机物残留物在污染土壤中被莴苣吸收的比较

天然有机矫正剂的使用是当前的农业实践，对于在受污染的土壤中生产植物可能具有优势。软木粉是软木工业的天然副产品，与更常用的土壤改良剂相比，具有许多潜在的好处。在这项工作中，对使用软木粉（一种非常规的有机残留物）和马粪肥（传统用于农业）来控制人工污染土壤中潜在有毒元素的利用进行了评估。每种元素使用四种浓度：Cr（100至800 mg kg ^-1），Ni（37.5至300 mg kg ^-1），Zn（150至1200 mg kg ^-1），Cd（1.5至12 mg kg ^-1））和Pb（150至1200 mg kg ^-1）。评价了这些元素在受控条件下在盆中生长的莴苣植物中的积累。除镉外，在研究的矫正剂用量下（在软木粉中为1％，在马粪中为0.5％），莴苣植物对不同元素的吸收均未发现显着差异。镉是莴苣中积累最多的元素。事实表明，在控制土壤中这些元素的生物利用度方面，软木粉不如马粪肥料有效。使用化学改性的软木塞产品进行进一步测试可以提高其效率。