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Articles

Phosphorus availability and soybean growth in contrasting Oxisols in response to humic acid concentrations combined with phosphate sources

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Pages 220-235 | Received 25 Sep 2018, Accepted 14 Apr 2019, Published online: 25 Apr 2019
 

ABSTRACT

Humic acid (HA) use can improve phosphorus (P) availability in soils with high P fixation capacity. The aim of this study was to evaluate soil P availability and soybean growth in both medium-texture (MT) and clayey (CL) Oxisols under humic acid carbon (C-HA) concentrations: 0, 5, 10, 50 and 100 mg kg−1, combined with Araxá phosphate rock (APR) and single superphosphate (SS). Mixtures of C-HA with P sources were incubated for 15 d. In sequence, the soil solution was extracted and analyzed for soil solution C (SSC), soil solution P (SSP) and soil solution electrical conductivity (EC). Soil initial resin-P and pH were determined before soybean sowing and, after harvest, shoot (SDM), root (RDM), total dry matter (TDM), soil residual resin-P and soil pH were determined. In CL fertilized with SS, the addition of C-HA increased SSP by 17%, residual resin-P by 42%, SDM, P and N accumulated in the shoot. Addition of C-HA reduced SSP and initial resin-P in MT treated with SS and increased in 18% residual resin-P in MT fertilized with APR. Effects of HA on soil attributes, soybean growth and nutritional status rely on HA concentration, soil texture and P source used.

Acknowledgments

This work was supported by the FAPEMIG; CAPES under Grant PROEX-AUXPE 593/2018; and CNPq under Grants 461935/2014-7 and 303899/2015-8.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior [PROEX-AUXPE 593/2018]; Fundação de Amparo à Pesquisa do Estado de Minas Gerais; Conselho Nacional de Desenvolvimento Científico e Tecnológico [303899/2015-8,461935/2014-7].

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