COMPATIBILITY BETWEEN GROWTH-PROMOTING MICROORGANISMS AND CHEMICAL MANAGEMENT IN THE EARLY DEVELOPMENT OF MAIZE

• DOI: https://doi.org/10.22533/at.ed.82081126150114

• Palavras-chave: Bacillus. Bio-inputs. Fungicides. Herbicides. Pseudomonas.

• Keywords: Bacillus. Bio-inputs. Fungicides. Herbicides. Pseudomonas.

• Abstract:

  The objective of this study was to evaluate the compatibility between biological and chemical products used in seed treatment, with an emphasis on inoculants and plant growth promoters. The research was conducted in two stages: in vitro assays, performed in Petri dishes with BDA (Potato-Dextrose-Agar) medium, and assays in Gerbox-type chambers, using commercial substrate treated with herbicides. In the in vitro assay, five biological microorganisms (Azospirillum sp., Bacillus sp., Pseudomonas sp., Trichoderma sp., and Paecilomyces lilacinus) were exposed to fungicides and herbicides, and microbial growth was assessed after 72 hours of incubation. The results indicated that Azospirillum sp. and Bacillus sp. showed tolerance, maintaining positive growth, while Pseudomonas sp., Trichoderma sp., and Paecilomyces lilacinus demonstrated sensitivity, with an absence or significant reduction in development. In Gerbox trials, conducted at different time points after herbicide application (15, 30, and 45 days), it was observed that treatments with Bacillus sp. and Pseudomonas sp. promoted greater leaf length and better initial performance of corn plants, outperforming the control and the treatment with Paecilomyces lilacinus. These results reinforce that compatibility between biological and chemical products is variable and depends on the microbial species and the active ingredient used. It is concluded that Bacillus sp. and Pseudomonas sp. have greater potential for integration into agricultural systems, contributing to more sustainable and efficient practices in seed and soil management.