Translations:Benutzer:Arian/Klett-Mini-Test/915/en

The individual species of field crops draw on soil fertility — that is to say, on the humus household — each in a different way. They accordingly exert upon the following crop a specific preceding-crop effect, determined largely by the quantity of harvest residues, above all by that of the root mass. The lowest preceding-crop value belongs to the root crops, and among these especially to the ridged crops such as potatoes and the like. These are regarded as humus consumers and leave behind for the crop rotation the smallest mass of humus-forming harvest residues: in the case of potatoes, 13 dt/ha, in the case of sugar beets, 8 dt/ha of dry root mass. The cereals are otherwise —