Composite Microbial System for Nitrogen Fixation
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Solution Overview
Problem
Current nitrogen-fixing bacteria applications in agriculture are limited by their single-strain approach, which does not leverage synergistic effects with non-nitrogen-fixing bacteria, leading to inefficient nitrogen fertilizer use and environmental issues like soil acidification and greenhouse gas emissions.
Innovation Solution
Development of an enhanced efficient nitrogen-fixing composite microbial system comprising nitrogen-fixing bacteria like Klebsiella MNAZ1050, Citrobacter MNAZ1397, and Pseudomonas MNAZ228, combined with non-nitrogen-fixing bacteria such as Acinetobacter ACZLY512 and Kluyvera AZ981, to create a microbial inoculum that promotes crop growth with reduced nitrogen fertilizer application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If single strain of nitrogen-fixing bacteria is used, then the system is simple and easy to apply, but the nitrogen-fixing efficiency and synergistic effects are limited
Solution Approach 1:
The patent combines multiple nitrogen-fixing bacteria strains (Azotobacter chroococcum, Azotobacter salinestris, Klebsiella pneumoniae) with non-nitrogen-fixing bacteria (Pseudomonas fluorescens, Bacillus subtilis) into a composite microbial system. This merging of different bacterial strains creates synergistic effects that enhance nitrogen fixation efficiency beyond what single strains can achieve, while maintaining practical applicability through a unified inoculum formulation.
Solution Approach 2:
The invention creates a composite microbial system that functions as a living composite material. Different bacterial strains are combined in specific ratios (nitrogen-fixing bacteria: non-nitrogen-fixing bacteria = 1:0.5 to 1:2) to achieve enhanced functional properties. The composite system leverages the complementary metabolic capabilities and ecological functions of different bacterial species to improve overall nitrogen fixation and plant growth promotion.
2Productivity
If large-scale application of nitrogen fertilizers is used, then crop yields increase, but ecological and environmental problems occur
Solution Approach 1:
The composite microbial system enables crops to obtain nitrogen through biological fixation by the bacteria themselves, rather than relying on externally applied synthetic fertilizers. The nitrogen-fixing bacteria convert atmospheric nitrogen into bioavailable forms that the plant can use directly. This self-service mechanism reduces dependency on chemical fertilizers and their associated environmental harms while maintaining crop productivity.
Solution Approach 2:
The patent converts the limitation of atmospheric nitrogen (which plants cannot use directly) into a benefit through bacterial nitrogen fixation. The bacteria perform the energy-intensive nitrogen conversion process that would otherwise require synthetic fertilizer production, transforming an unavailable resource (N2 gas) into a useful nutrient while avoiding the environmental costs of industrial nitrogen fixation.
3Object-affected harmful factors
If nitrogen-fixing bacteria are used to reduce nitrogen fertilizer application, then environmental issues are mitigated, but nitrogen-fixing ability and crop response vary among different strains
Solution Approach 1:
The patent assigns different functional roles to different bacterial strains within the composite system. Nitrogen-fixing strains (Azotobacter, Klebsiella) are optimized for nitrogen fixation, while associated strains (Pseudomonas, Bacillus) provide complementary functions such as phosphate solubilization, plant hormone production, and pathogen suppression. This functional differentiation ensures reliable and consistent performance across diverse agricultural conditions.
Solution Approach 2:
The composite microbial system provides multiple functions simultaneously: nitrogen fixation, phosphate solubilization, plant growth promotion through hormone production, and disease suppression. This multi-functionality ensures that the system delivers consistent benefits across different crop types and environmental conditions, reducing the variability problems associated with single-strain applications.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composite microbial system demonstrates significant nitrogenase activity and improved maize growth, including increased root and aboveground biomass, under both aerobic and microaerobic conditions, showcasing enhanced nitrogen fixation and environmental adaptability.
Implementation Method 1
biological nitrogen fixation becomes one of the important ways to reduce the application of nitrogen fertilizer in agriculture
Implementation Method 2
The composite microbial system demonstrates significant nitrogenase activity and improved maize growth
Data Source
AI summary
Disclosed are an enhanced efficient nitrogen-fixing composite microbial system added with non-nitrogen-fixing bacteria and application thereof, belonging to the technical field of agricultural microorganisms. The present disclosure provides enhanced efficient nitrogen-fixing bacteria, including at least one selected from a group of Klebsiella MNAZ1050, Citrobacter MNAZ1397 and Pseudomonas MNAZ228; also, the disclosed enhanced efficient nitrogen-fixing composite microbial system includes nitrogen-fixing bacteria and non-nitrogen-fixing bacteria, where the nitrogen-fixing bacteria includes at least one of the above three nitrogen-fixing bacteria, and the non-nitrogen-fixing bacteria includes at least one of Acinetobacter ACZLY512 and Kluyvera AZ981.