title: Effect of actinomycete metabolites on ion absorption by rice seedlings.
abstract: Humic fractions of molecular weight above (HSp) and below (HEf) 3.5 Kds obtained from faeces of earthworms (Allolobophora rosea and A. caliginosa), were compared with the exhausted culture broth of Actinomycetes (EAB) isolated from the same source. Hormone-like activity and efficiency of nitrate uptake by rice seedlings were stimulated by EAB and HEf, while HSp showed only negligible activity. EAB showed a stimulatory action on plant growth (dry weight) and affected the K, Ca, Mg, Fe absorption during the first two weeks of plant growth.
authors.affiliation: Department of Agricultural Biotechnology, University of Padua, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Nardi
authors.forename: G
authors.initials: G
authors.lastname: Arnoldi
authors.forename: G
authors.initials: G
authors.lastname: Dell'Agnola
mesh_terms: D000192:Actinomycetales / Q000378:metabolism*; D005243:Feces; D009566:Nitrates / Q000378:metabolism; D009835:Oligochaeta; D012275:Oryza; D010944:Plants / Q000378:metabolism*; D013302:Streptomyces / Q000378:metabolism
chemical_list: D009566:Nitrates