66 Te ch no lo gy So il cu lt iv at io n Soil exhaustion is a serious problem for tree nurseries Chemicals are often used to kill soil borne pests and weed seeds A relatively recently developed alternative is the mobile continuous steaming of the soil A prototype soil steamer was tested on differently used areas in nurseries Aspects studied included the technical equipment itself its ground speed soil temperature and moisture nutrient transfer the impact on water runoff soil life and the period of application RESULTS The thermal treatment of seed beds in tree nurseries using a mobile soil steamer is an alternative to the use of chemical agents it has been tried and tested and is ready for practical use Using the steamer shortly before sowing is optimal as it means that the areas will not become muddy The best effect is achieved at a temperature of 80 85 C measured at a depth of 5 cm For this purpose a speed of less than 100 m per hour or an application time of 6 8 minutes needs to be maintained The area treated is thus around one hectare per week Optimal efficiency is only achieved with good soil moisture FINAL REPORT www eip agrar sh de en eip innovationprojects 1st call thermal soil treatment CONTACT PERSON Dr Heinrich Lösing phone 49 4120 7068301 dr loesing vub sh SOIL STEAM STERILISATION AN ALTERNATIVE TO CHEMICALS Thermal soil treatment Der Prototyp einer Dämpfungsmaschine wurde auf unterschiedlich genutzten Flächen in Baumschulen getestet

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