The influence of humic and fulvic acids on silver uptake by perennial ryegrass, and its relevance to the cycling of silver in soils

• Published in: Plant and soil 1986-01, Vol.95 (1), p.3-8
• Main Authors: JONES, K.C., PETERSON, P.J.
• Format: Article
• Language: English
• Subjects: Acid soils; Agronomy. Soil science and plant productions; Animal and plant ecology; Animal, plant and microbial ecology; Biological and medical sciences; Chemical, physicochemical, biochemical and biological properties; Desert soils; Forest soils; Fundamental and applied biological sciences. Psychology; General agronomy. Plant production; Lolium perenne; Organic matter; Organic soils; Physics, chemistry, biochemistry and biology of agricultural and forest soils; Plant roots; Plants; Sedimentary soils; Soil biochemistry; Soil pollution; Soil science; Soil-plant relationships. Soil fertility; Soil-plant relationships. Soil fertility. Fertilization. Amendments; Synecology; Terrestrial ecosystems
• ISSN: 0032-079X; 1573-5036
• DOI: 10.1007/BF02378846

An experiment in which perennial ryegrass (Lolium perenne L.) was grown in solution cultures containing various forms of radiosilver (¹¹⁰m Ag) is d u v » . ^ . _ ptake of labelled Ag from solutions containing either AgNO₃, Ag₂SO₄, AgCH₃COO, Ag-humic acid (HA) or Ag-fulvic acid (FA) complexes is compared. In each case concentrations of Ag in the plant roots was several fold higher than in the plant shoots. However the Ag concentration in roots from the Ag-HA preparations was only about 5% of that from the AgNO₃ solutions; from Ag-FA it was 18%. Transport index values were highest for plants grown in the Ag-HA solution, indicating greater mobility of Ag within these plants. Preliminary data for a selective extraction procedure performed on Ag-HA preparations suggest sorption onto various active sites. The relevance of these findings to the cycling of Ag within soils is discussed.