Rhizobacteria with Emphasis on Biological Nitrogen Fixation and Phosphorus Solubilization in Alfalfa Crops
DOI:
https://doi.org/10.17921/1415-6938.2026v30n2p184-197Abstract
The alfalfa (Medicago sativa) in addition to promoting cultivation diversification and generating jobs in the pioneer north of Paraná-Brazil, stands out in animal feed due to its qualitative and agronomic characteristics. The objective of this study was to evaluate the application of rhizobacteria in post emergence in the management of alfalfa crop irrigated by sprinklers. The rhizobacteria were covered in alfalfa crops. Commercial products based on Pseudomonas fluorescens (isolated CCTB03) + Azospirillum brasilense (isolated AbV6), Bacillus megaterium (isolated BRM 119) + Bacillus subtilis (isolated BRM 2084) and Sinorhizobium meliloti (isolated SEMIA 134 e SEMIA 135) were applied. The cultivation area was irrigated for two hours before application and four hours after application. Seven cuts of alfalfa were performed every 39 to 41 days. Before each cut, the height of 20 plants per plot was measured on the first leaf below flowering. The leaf area index (LAI) and dry matter (DM) total area considered (m2) were evaluated. The experimental design used was randomized blocks, with 8 treatments and 3 repetitions, totaling 24 plots. The application of rhizobacteria in coverage showed significant differences in alfalfa crops. Dry matter yield increased 28.15% per cut, above the control. To facilitate the implementation of management for rural producers, the results propose post-emergence applications in alfalfa crops.
Keywords: Forage Legume. Alfalfa Productivity. Microrganisms.
Resumo
A alfafa (Medicago sativa) além de promover a diversificação de culturas e gerar empregos no norte pioneiro do Paraná-Brasil, se destaca na alimentação animal devido suas características qualitativas e agronômicas. O objetivo deste trabalho foi avaliar a aplicação de rizobactérias em pós emergência no manejo da cultura de alfafa irrigada por aspersores. As rizobactérias foram aplicadas em cobertura na cultura de alfafa. Foram aplicados os produtos Pseudomonas fluorescens (isolado CCTB03) + Azospirillum brasilense (isolado AbV6), Bacillus megaterium (isolado BRM 119) + Bacillus subtilis (isolado BRM 2084) e Sinorhizobium meliloti (isolados SEMIA 134 e SEMIA 135). A área de cultivo foi irrigada por duas horas antes da aplicação e quatro horas após a aplicação. Foram realizados sete cortes da alfafa a cada 39 a 41 dias. Antes de cada corte mensurou-se a altura de 20 plantas por parcela na primeira folha abaixo da floração. Avaliou-se o índice de área foliar (IAF) e matéria seca (MS) área total considerada (m2). O delineamento experimental utilizado foi de blocos casualizados, com 8 tratamentos e 3 repetições, totalizando 24 parcelas. A aplicação das rizobactérias em cobertura demonstraram diferenças significativas na cultura da alfafa. A produtividade de matéria seca aumentou 28,15% por corte, acima do controle. Para facilitar a implantação do manejo para os produtores rurais os resultados propõem as aplicações em pós emergência na cultura de alfafa.
Palavras-chave: Forrageira Leguminosa. Produtividade da Alfafa. Microrganismos.
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Copyright (c) 2026 Erich dos Reis Duarte, Aline Vanessa Sauer, Eduardo Lopes Cancellier, Rodrigo Foltran, Cristiano Reschke Lajús, Éttore Guilherme Poletto Diel
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