Dry-Matter Production and Phosphorus Accumulation by Maize Plants in Response to the Addition of Organic Acids in Oxisols

Organic acids (OA) play an important role in phosphorus (P) availability in soils. They can be adsorbed with great energy by the soil mineral fraction, reducing P adsorption and increasing P availability to plants. The aim of this study was to evaluate the effect of different sources (acetic acid, A...

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Bibliographic Details
Published in:Communications in soil science and plant analysis 2007-11, Vol.38 (19-20), p.2733-2745
Main Authors: Andrade, F.V, Mendonca, E.S, Silva, I.R, Mateus, R.F
Format: Article
Language:English
Subjects:
acetic acid
agricultural soils
Agronomy. Soil science and plant productions
Biological and medical sciences
citric acid
dry matter accumulation
Fundamental and applied biological sciences. Psychology
Humic acid
humic acids
low-molecular-weight-organic acids
nutrient availability
nutrient uptake
organic acids and salts
Oxisols
phosphorus
phosphorus bioavailability
plant growth
Soil science
Zea mays
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Summary:Organic acids (OA) play an important role in phosphorus (P) availability in soils. They can be adsorbed with great energy by the soil mineral fraction, reducing P adsorption and increasing P availability to plants. The aim of this study was to evaluate the effect of different sources (acetic acid, AA; citric acid, CA; and humic acids, HA) and doses of OA on P uptake and dry-matter production by corn plants grown in highly weathered soils. Samples (2 dm3) of a clayey Red Latosol, RL (Rhodic Haplustox), and a sandy loam Red Yellow Latosol, RYL (Typic Haplustox), were accommodated in plastic pots located in a greenhouse. Phosphorus (K2HPO4) and/orOA were applied at different timings: organic acid added before (OABP) or simultaneously (OASP) to the phosphate application. The OA doses ranged from 0.0 to 8.0 mmol L(-1). The doses of humic acids ranged from 0.0 to 12 g dm(-3) and were equivalent to an organic compost addition of 0 to 80 t ha(-1). The addition of OA influenced dry-matter production and P uptake by corn plants in both soils. The effectiveness of OA in increasing P uptake and dry-matter production of corn plants followed the order humic acids > citric acid > acetic acid. In both soils, the greatest dry-matter production and P uptake were obtained when OA were applied to the soil before P was added (OABP).
ISSN:0010-3624
1532-2416
DOI:10.1080/00103620701662976