Journal Article

Selected bacterial strains enhance phosphorus availability from biochar-based rock phosphate fertilizer

de Oliveira-Longatti, Silvia Maria, Filho, José Ferreira Lustosa, de Amaral Leite, Aline, de Almeida Leite, Rafael, de Souza Moreira, Fatima Maria, Melo, Leônidas Carrijo Azevedo, de Souza Cardoso, Arnon Afonso

2020

Overview

Purpose The co-pyrolysis of biomass and soluble phosphates generates biochar-based phosphate fertilizers (BBF), which may enhance phosphorus (P) input in soil and P uptake by plants. Conversely, pyrolysis of biomass impregnated with rock phosphate results in low P solubility and may not supplement plant requirement in short term. However, bacterial strains promoting rock phosphate solubilization increases P use efficiency and can be applied to BBFs. Methods An in vitro assay was conducted to investigate the solubilization profile of five bacterial strains ( Pseudomonas sp.—UFPI-B5-8A, Burkholderia fungorum —UFLA 04-155, Acinetobacter sp.—UFLA 03-09, Paenebacillus kribbensis —UFLA 03-10, and Paenibacillus sp.—UFLA 03-116) isolated from common bean and cowpea nodules in a rock phosphate BBF. Additionally, a pot trial was carried out aiming to investigate the influence on maize growth by inoculation of three selected strains under a rock phosphate BBF fertilization. Results Inoculations with UFPI B5-8A, UFLA 04-155, and UFLA 03-09 were efficient in solubilizing P in vitro, being closely associated with pH decrease, likely due to the release of organic acids. As for the pot trial, the dose of 400 mg kg −1 of P in the BBF using UFPI B5-8A significantly increased maize shoot dry matter. All strains significantly enhanced P availability in the soil. Conclusions Bacterial inoculation in biochar-based rock phosphate aiming to improve its fertilizer value is an inexpensive and sustainable strategy to improve maize growth and enhance available P in soil and should be further explored.

• Publisher: Springer International Publishing,Springer,Springer Nature B.V
• Subject: Acinetobacter / Applied Microbiology / Bacteria / Biomass / Biomedical and Life Sciences / Burkholderia / Charcoal / corn / cowpeas / Dry matter / Fertilization / Fertilizers / in vitro studies / Inoculation / Life Sciences / Medical Microbiology / Microbial Ecology / Microbial Genetics and Genomics / Microbiology / Mycology / Nodules / nutrient use efficiency / Organic acids / organic acids and salts / Original Article / Paenibacillus / Phosphate / Phosphate minerals / Phosphate rock / Phosphates / Phosphatic fertilizers / Phosphorus / phosphorus fertilizers / Plant bacterial diseases / Pseudomonas / Pyrolysis / rock phosphate / soil / Soil microorganisms / solubility / Solubilization / soluble phosphates / Strains (organisms) / Zea mays