Root growth promotion by humic acids from composted and non-composted urban organic wastes

Background and aims Besides general effect of organic residues on soil quality and plant crop, hormonal direct effect on plant growth by extracted humic acids of organic materials is interesting and profitable theme. In the present work, we studied on direct interaction between humic acid and root g...

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Bibliographic Details
Published in:Plant and soil 2012-04, Vol.353 (1-2), p.209-220
Main Authors: Jindo, Keiji, Martim, Silvia Aparecida, Navarro, Elena Cantero, Pérez-Alfocea, Francisco, Hernandez, Teresa, Garcia, Carlos, Aguiar, Natália Oliveira, Canellas, Luciano Pasqualoto
Format: Article
Language:English
Subjects:
Acid soils
Adenosine triphosphatase
Agricultural soils
Agronomy. Soil science and plant productions
Animal, plant and microbial ecology
Biochemistry
Biological and medical sciences
Biomedical and Life Sciences
Biosolids compost
Chemical, physicochemical, biochemical and biological properties
Chromatography
Composting
Composts
Crops
Ecology
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
Growth
H super(+)-transporting ATPase
Humic acid
Humic acids
Hydrophobicity
Life Sciences
Morphology
Municipal solid waste compost
Municipal solid wastes
Municipal wastes
N.M.R
Organic matter
Organic soils
Organic waste treatment
Organic wastes
Other nutrients. Amendments. Solid and liquid wastes. Sludges and slurries
Physics, chemistry, biochemistry and biology of agricultural and forest soils
Plant biology
Plant extracts
Plant growth
Plant Physiology
Plant roots
Plant Sciences
Plants
Plasma membranes
Promoters
Protons
Refuse and refuse disposal
Regular Article
Rhizosphere
Root growth
Roots
Sewage sludge
Sludge
Soil
Soil biochemistry
Soil science
Soil Science & Conservation
Soil-plant relationships. Soil fertility
Soil-plant relationships. Soil fertility. Fertilization. Amendments
Soils (organic)
Solid wastes
Vesicles
Zea mays
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Summary:Background and aims Besides general effect of organic residues on soil quality and plant crop, hormonal direct effect on plant growth by extracted humic acids of organic materials is interesting and profitable theme. In the present work, we studied on direct interaction between humic acid and root growth, depending on different origin of organic materials. Methods All extracted humic acids of four organic materials (sewage sludge, compost sewage sludge, municipal solid waste, compost municipal solid waste) were characterized chemically by elemental analyses, ion pair chromatography (ICP), size exclusion chromatography (HPSEC), solid-state nuclear magnetic resonance (13C-CPMAS-NMR) and quantification of IAA. Later, different morphological effects on maize (principal root growth, lateral root growth, root area, root mitosic site, root dry weight and H+-ATPase activity of plasma membrane) were analyzed. Results All humic acids samples promoted root growth and proton pump activity in maize vesicles, especially those composted samples, which contained more carboxylic groups and had a more hydrophobic character, produced preferentially morphological and biochemical effects.
ISSN:0032-079X
1573-5036
DOI:10.1007/s11104-011-1024-3