Soils are a non-renewable and endangered natural resource. The aim of this thesis was to improve a low fertility, highly acidic (pH = 3.8) silty clay loam (SCL) soil (sand = 3.3 %; silt 63.1 %; clay = 33.6 %) with natural amendments (limestone 0 4 mm, zeolite 0-2 mm) and industrial wastes (Siporex 0-16 mm, gypsum board 0 16 mm). We conducted two preliminary and one main experiment. Based on the results of the preliminary experiments, in which we evaluated the effects of the additives on soil pH and texture, we determined the dosage of additives (3, 25 and 50 mass %) for a pot experiment with Chinese cabbage (Brassica rapa subsp. pekinensis L.), using a control soil without additives as a control. At the end of the pot experiment, soil pH, soil texture and gravel content, electrical conductivity, available phosphorus and potassium, cation exchange capacity, infiltration rate and bulk density of the soil were measured, and the yield of the cabbage was determined. Soil acidity was significantly reduced by the addition of Siporex and limestone, and even at the lowest dose (3 %), soil pH was > 5.7. A 3 % dose had no effect on soil texture. At a dose of 25 %, the addition of gypsum board and Siporex (silty loam) improved soil texture better than the addition of limestone and zeolite (clay loam). At a dose of 50 %, the texture of all mixtures with additives was loam. All types of additives had a positive effect on cabbage yield. At 50 % dose, cabbage yield decreased as compared to 25 % dose. When gypsum board was added, the yield was also lower (47.5 %) compared to the control. The highest yield, 61 % higher than the control, was measured in cabbage in soil with 25 % addition of Siporex. For practical use, addition of Siporex would be recommended, but for extended use we suggest further research.
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