Long time gardener Kurt Kretschmann has focused his experiments on mulching techniques. He uses exclusively plants-based mulches for his fertilization. Among his observations are increased soil activity (i.e. earthworms), and better water retention. The book also includes wise observations and scientific analysis from chemist Rudolf Behm.
KRETSCHMANN, Kurt and Rudolf BEHM. Mulch total - Der Garten der Zukunft. OLV Organischer Landbau Verlag, Mars 2003, 174 p. ISBN: 3922201180 Only available in German