The aim of the study was to analyse the quality of soil in urban allotment gardens in the context of the production of home-grown vegetables. The study was conducted on six allotment gardens (31 individual plots) in Gorzów Wielkopolski, a medium-sized Polish city with an average level of industrialisation. The following soil characteristics were analysed: pH, electric conductivity, organic matter, organic carbon, humus, total nitrogen, C:N ratio, NH₄⁺-N, NO₃-N⁻, P, K, Ca, Mg, SO₄⁻-S, Cl, Na, Fe, Cu, Zn, Mn, Ni, Cr, Cd, Pb. The analyses showed that the soils were abundant in necessary nutrients for vegetable growing. They had high content of calcium, magnesium, and phosphorus. However, the soil pH in areas of vegetable cropping was too high. The content of toxic heavy metals—cadmium (0.22–0.59 mg∙kg⁻¹ d.m.) and lead (3.46–16.89 mg∙kg⁻¹ d.m.)—was within the acceptable limits. Nevertheless, the chemical analysis of carrots used as test vegetables showed that the permissible limits of cadmium and lead content in their roots were exceeded. The excessive uptake of these toxic metals can be reduced by lowering the soil pH and applying organic carbon to the soil.

中文翻译：

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土壤质量是家庭消费蔬菜生产的关键因素——以戈尔茹夫维尔科波尔斯基（波兰）城市土地分配为例

该研究的目的是在自产蔬菜生产的背景下分析城市分配花园的土壤质量。该研究是在 Gorzów Wielkopolski 的六个分配花园（31 个独立地块）进行的，Gorzów Wielkopolski 是一个中等工业化水平的波兰中等城市。分析了以下土壤特性：pH、电导率、有机质、有机碳、腐殖质、总氮、C:N 比、NH ₄ ⁺ -N、NO ₃ -N ^-、P、K、Ca、Mg、SO ₄ ^--S、Cl、Na、Fe、Cu、Zn、Mn、Ni、Cr、Cd、Pb。分析表明，土壤中富含蔬菜生长所需的养分。它们的钙、镁和磷含量很高。然而，蔬菜种植区土壤pH值过高。有毒重金属镉 (0.22–0.59 mg∙kg ^-1 dm) 和铅 (3.46–16.89 mg∙kg ^-1 dm) 的含量在可接受范围内。然而，用作试验蔬菜的胡萝卜的化学分析表明，其根部的镉和铅含量超过了允许限度。这些有毒金属的过度吸收可以通过降低土壤 pH 值和向土壤施用有机碳来减少。