Potential of Industrial By-Products as Liming Materials and Digestate as Organic Fertilizer and Their Effect on Soil Properties and Yield of Alfalfa (Medicago sativa L.)

Acid soils with pH values below 5.5 have a negative effect on agricultural production. For this reason, liming is applied as measure to raise the soil optimum (pH = 6–7). The aim of our research was evaluate and compare effectiveness four materials (wood ash from biomass powerplant, filter dust cement factory, blast furnace slag iron carbocalk (limestone, by-product sugar factory)) in combination without solid digestate (a biogas plant) organic fertilizer. Two field trials were set up determine studied neutralize acidity, impact fertility nutrient status soil. results showed that all raised Out these four, wood be best while worst. yield alfalfa increased application lime materials. Application matter had slightly higher yields compared digestate. highest achieved ash, probably due somewhat concentrations potassium phosphorus ash. Further financial aspects investigated by-products necessary exploit their potential material.