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The combination of Arachis pintoi green manure and natural phosphate improves maize growth, soil microbial community structure and enzymatic activities

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Abstract

Aims

We investigated the effect of the co-composting of Arachis pintoi (AP) as green manure with different sources of rock phosphate on maize growth and soil properties.

Methods

Composts were prepared combining AP and different rock phosphates (simple superphosphate, apatite rock phosphate, reactive rock phosphate and thermophosphate), alone or in combination with AP. The incorporation of AP and natural phosphate was conducted in a greenhouse, and we investigated its effects on plant total dry matter, phosphorus absorption, microbial biomass carbon and phosphorus, total organic carbon, soil basal respiration, enzymatic activities (acid phosphatase, alkaline phosphatase and urease) and the soil microbial structure community.

Results

The application of natural thermophosphate phosphates with AP is an efficient management strategy for maize cultivation, with increases of more than 124% in maize dry matter, more than 300% in P uptake and 62% in soil microbial biomass carbon.

Conclusions

The use of Arachis pintoi as green manure, combined with natural phosphate sources, represents an alternative fertilisation approach for maize cultivated on Entisols, enhancing the bioavailability of P from natural rock phosphate. It is a sustainable and financially attractive option to ensure the environmental integrity of cultivation, food and soil security.

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Acknowledgements

We thank to the Conselho Nacional de Desenvolvimento Científico e Tecnologia (CNPq) for financial support (Process 481436/2010-3 and 562584/2010-2) and for providing a scholarship to the corresponding author (306401/2015-0). We also thank the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Capes), Universidade Federal Rural de Pernambuco (UFRPE) and Financiadora de estudos e Pesquisas (FINEP). Anonymous reviewers have provided valuable suggestions and comments and thereby greatly improved this manuscript.

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Correspondence to Erika Valente de Medeiros.

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Responsible Editor: Tim S. George.

Highlights

1. Arachis pintoi as green manure increases the solubilisation of natural phosphates and the absorption of P by maize plants.

2. The combination of thermophosphate and Arachis pintoi resulted in a 4-fold increase in maize dry matter.

3. Natural phosphates with Arachis pintoi stimulated soil microbial biomass, total FAMEs, fungi and bacteria.

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de Medeiros, E.V., Silva, A.O., Duda, G.P. et al. The combination of Arachis pintoi green manure and natural phosphate improves maize growth, soil microbial community structure and enzymatic activities. Plant Soil 435, 175–185 (2019). https://doi.org/10.1007/s11104-018-3887-z

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  • DOI: https://doi.org/10.1007/s11104-018-3887-z

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