Residual phosphate fertiliser and Azospirillum brasilense inoculation on soil quality and soybean productivity

Authors

Keywords:

System fertilization, Enzymatic activity, Diazotrophic bacteria, Residual effect, Soil health

Abstract

In highly weathered tropical soils, maintaining an adequate level of labile phosphorus in the system is challenging due to its constant fixation. As an alternative, producers resort to heavy mineral fertilization to maintain proper nutrient levels in the soil. The use of biological techniques, such as inoculation/co-inoculation with growth-promoting bacteria (PGPB) and phosphate-solubilizing bacteria, has gained prominence in reducing production costs. Based on this premise, the objective of this study was to evaluate the residual effect of phosphate fertilization in a long-term no-tillage system (SPD), determining whether the interaction with or without inoculation of pre-soybean crops with Azospirillum brasilense contributed to increases in soybean production components, productivity, and soil quality bioindicators. The experiment was conducted on a typical clayey dystrophic oixsol, using a randomized block design with four replications, arranged in a 5x2 factorial scheme. Five doses of P2O5 in the form of MAP were applied in 2013 and 2020, with and without inoculation of grasses in rotation with soybeans. It was found that only in the 2019/20 season did inoculation of pre-soybean crops have a positive effect, increasing the plant population. Microbiological activity responded positively, demonstrating that cropping systems that maintain adequate soil health, combined with the inoculation of grasses with Azospirillum brasilense, can be a viable, cost-effective management strategy, supporting crops and contributing to system fertilization.

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Published

2026-03-09

Data Availability Statement

The research data is available in the repository (http://hdl.handle.net/11449/235708).

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Section

Soil Science

How to Cite

SOUTO FREITAS, Beatriz; CRISTINA MODESTO, Viviane; CÂMARA DE SOUZA JÚNIOR, Nelson; ALMEIDA MOREIRA GIRARDI, Vitória; ANTUNES ALVES RIBEIRO, Naiane; MARCHETTI SILVA MATOS, Aline; ANDREOTTI, Marcelo. Residual phosphate fertiliser and Azospirillum brasilense inoculation on soil quality and soybean productivity. Revista Ciência Agronômica, [S. l.], v. 57, p. 1–14, 2026. Disponível em: https://periodicos.ufc.br/revistacienciaagronomica/article/view/94408. Acesso em: 5 jun. 2026.