Literaturrecherche

Literatur Tietjen C (1977) The yield efficient nitrogen portion in treated and untreated manure. In: Voorburg JH (ed) Utilisation of manure by land spreading : a seminar in the EEC programme of Co-ordination of Research on Effluents, organised by the Istituto Sperimentale Agronomico, Modena, September 20 - 24, 1976. Luxembourg: EDSC ; EEC ; EAEC, pp 129-141