Journal Article

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

Jindo, Keiji, Aguiar, Natália Oliveira, Canellas, Luciano Pasqualoto, Pérez-Alfocea, Francisco, Navarro, Elena Cantero, Hernandez, Teresa, Martim, Silvia Aparecida, Garcia, Carlos

2012

Overview

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.

• Publisher: Springer,Springer Netherlands,Springer Nature B.V
• Subject: 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 / Corn / Crops / Ecology / Fundamental and applied biological sciences. Psychology / gel chromatography / General agronomy. Plant production / Growth / growth promotion / H super(+)-transporting ATPase / Humic acid / Humic acids / Hydrophobicity / indole acetic acid / ion pair chromatography / Life Sciences / Morphology / MSW composts / Municipal solid waste / Municipal solid waste compost / Municipal solid wastes / Municipal wastes / N.M.R / NMR / Nuclear magnetic resonance / nuclear magnetic resonance spectroscopy / 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 membrane / Plasma membranes / Promoters / proton pump / Protons / Refuse and refuse disposal / Regular Article / Rhizosphere / Root growth / Roots / Sewage sludge / Sludge / Soil / Soil biochemistry / Soil quality / Soil science / Soil Science & Conservation / Soil-plant relationships. Soil fertility / Soil-plant relationships. Soil fertility. Fertilization. Amendments / Soils (organic) / Solid wastes / Vesicles / Zea mays