Bioorganic fertilizer research for Fusarium wilt disease suppression in soybean and banana cropping systems

Overview

This research program investigates the mechanisms by which bioorganic fertilizers suppress Fusarium wilt disease in continuous cropping systems, using soybean and banana as test crops. The work addresses a critical agricultural challenge: soil-borne Fusarium pathogens that build up under monoculture and devastate yields. By systematically comparing sterilized versus non-sterilized organic fertilizers, with and without inoculated biocontrol strains, the research isolates the individual contributions of the organic substrate, the resident fertilizer microbiome, and the introduced biocontrol agent. The goal is to inform the design of optimized disease-suppressive soil management strategies.

Technical specifications

Research approach:

• Continuous cropping trials in Fusarium-infested soils for soybean and banana
• Four-treatment factorial design crossing sterilized or non-sterilized organic fertilizer with presence or absence of inoculated biocontrol strain
• Soil microbial community tracking across treatments to link community shifts to disease outcomes
• Targeted analysis of the genus Pseudomonas, a soil-borne group with demonstrated disease-suppression potential
• Disentangling relative contributions of substrate chemistry, fertilizer microbiome, and biocontrol inoculum

Key scientific questions:

• Which component of bioorganic fertilizer drives disease suppression: the substrate, the native microbial community, or the inoculated strain?
• How do resident soil microbial communities change in response to each treatment, and do these changes correlate with disease reduction?
• Can findings from soybean systems be extended to banana continuous cropping under Fusarium pressure?

Technology readiness level

The soybean component of this research has been initiated, with soil microbial community tracking and Pseudomonas-focused analyses underway or completed. The banana validation phase is planned as a follow-on study, applying the same four-treatment experimental framework to continuous banana cropping in Fusarium-infested soil. This positions the work at an early-to-mid stage of validation, generating mechanistic understanding that can guide formulation of next-generation bioorganic fertilizers for practical deployment in subtropical cropping systems.