Translations:Benutzer:Arian/Klett-Mini-Test/917/en

whose root dry mass comes to 30 dt/ha for rye and an average of 23 dt/ha for the other cereal crops. They occupy a middle position with regard to preceding-crop value, particularly when one takes account of the straw masses that as a rule serve for bedding in the stall and find their way back into the crop rotation by way of farmyard manure. The highest preceding-crop value belongs to the legumes, and among these to the main fodder plants — red clover at 42 dt/ha and lucerne at 52 dt/ha of root dry mass. Beyond that, they penetrate in depth and breadth comparatively the largest root space, with the longest individual root fibres. The fodder legumes, used predominantly over two years, are regarded as humus-builders. The measured mutual attunement of root crops, cereal crops, and fodder legumes forms the basic framework of every crop rotation that is designed to preserve the humus household — or better still to increase it.