slag
noun: waste that is produced after coal or a metal has been taken out of the earth and processed

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Schauberger
Particularly serious mistakes were made through the spreading of blast-furnace slag (so-called artificial fertilisers), whose intensified combustion once again robs the soil of its essential energy concentrates, the congealed oily sweetness, which the de-energised and finely pulverised slag then drags to itself from the surrounding negatively potentiated groundwater. Artificial fertilisers therefore remove the blood of the Earth's formative substances, which it must supply to the plants indirectly for the purposes of further ennoblement. In this way too, those levitational factors were eliminated which triable the specifically heavy groundwater to maintain its precarious suspension on steep slopes. From this it can be seen how dangerous are the influences of fire and the lower-grade, expansively and explosively functioning temperatures that arise from fire-affected masses. [The Energy Evolution - Harnessing Free Energy from Nature, Cadaverine Poison in Ray-Form - Ptomaine Radiation]