Stable Liquid Diazotroph Formulation for pH and Shelf-Life Control
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Solution Overview
Problem
Existing agricultural formulations for nitrogen-fixing microorganisms face challenges with microbial stability, shelf life, and ease of use, particularly in liquid form, which complicates storage and delivery.
Innovation Solution
Agronomically stable liquid agricultural compositions comprising diazotrophic bacteria, buffering agents, microbial stabilizers, and physical stabilizers, providing a room temperature shelf life of at least 30 days with minimal microbial decay and pH maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If liquid formulations of nitrogen-fixing microorganisms are used, then ease of application and control over formulation process are improved, but shelf life and storage stability deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-formulating the microbial suspension with stabilizing agents (buffering agents, protective carbohydrates, and surfactants) during the formulation process. This preliminary stabilization ensures that when the product is applied to fields, the microorganisms are already protected and ready to colonize plants effectively, resolving the contradiction between ease of application and shelf life stability.
Solution Approach 2:
The patent employs parameter changes by adjusting pH levels using buffering agents (maintaining pH 6.0-8.0), controlling microbial cell density (10^8-10^10 CFU/mL), and optimizing concentrations of protective substances. These parameter optimizations enable the liquid formulation to maintain stability at room temperature for extended periods while remaining easy to apply.
2Stability of the object's composition
If dry powder formulations are used, then stability and ease of storage are improved, but ease of operation deteriorates due to required mixing and activation steps
Solution Approach 1:
The patent applies this principle by creating a ready-to-use liquid formulation that eliminates the need for user activation steps. The product is formulated as a stable, pre-mixed suspension that can be directly applied to plants or soil, similar to how disposable products eliminate preparation steps. This resolves the contradiction by making the product both stable and immediately usable without requiring field activation.
Solution Approach 2:
The liquid formulation is designed to be self-stabilizing through incorporated buffering agents and protective substances that maintain microbial viability without user intervention. The formulation automatically maintains optimal pH and protects microorganisms during storage and application, eliminating the need for user mixing or activation steps while preserving stability.
3Ease of operation
If activated dry formulations are used, then ease of application is improved, but microbial stability deteriorates due to compromised viability during activation
Solution Approach 1:
The patent applies preliminary action by pre-stabilizing the microbial suspension with buffering agents and protective substances during manufacturing. This preliminary protection ensures that microorganisms maintain viability throughout storage and application without requiring field activation, thereby preserving microbial stability while maintaining ease of application.
Solution Approach 2:
The patent uses buffering agents and protective substances as intermediaries that mediate between the microorganisms and the external environment. These intermediaries buffer pH changes, protect against oxidative stress, and maintain cellular integrity during storage and application, preventing viability loss while keeping the product easy to apply.
4Duration of action of stationary object
If liquid formulations with extended shelf life are developed, then storage stability is improved, but formulation complexity increases due to multiple stabilizing agents
Solution Approach 1:
The patent applies universality by selecting buffering agents (such as phosphates or borates) that perform multiple functions: they maintain optimal pH for microbial stability, buffer against environmental pH changes during application, and provide ionic strength that stabilizes cellular structures. This multi-functionality extends shelf life while minimizing the number of separate additives needed.
Solution Approach 2:
The patent employs composite materials by combining buffering agents with protective carbohydrates (such as trehalose or sucrose) and surfactants in a synergistic formulation. This composite approach creates a unified stable system where each component enhances the protective effect of the others, extending shelf life while maintaining a manageable formulation structure rather than requiring numerous separate additives.
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 compositions maintain microbial stability and pH over extended periods, ensuring effective nitrogen fixation and crop yield enhancement, reducing infield variability and the need for exogenous nitrogen application.
Implementation Method 1
b) a buffering agent
Implementation Method 2
c) a microbial stabilizer
Implementation Method 3
d) a physical stabilizer
Data Source
AI summary
The present disclosure provides agronomically stable liquid agricultural compositions, methods of formulation thereof, and methods of application thereof. The agricultural compositions comprise nitrogen-fixing microorganisms and one or more of a buffering agent, a microbial stabilizer, and a physical stabilizer. The disclosed liquid agricultural compositions have a longer shelf life and greater ease of application than other existing dry and liquid formulations. The disclosed liquid agricultural compositions are stable for a period of thirty days or longer with low toxin accumulation and high microbial stability. The compositions are suitable for use on agricultural plant tissues or the environs thereof for providing a source of fixed atmospheric nitrogen to the agricultural plant. The compositions are used to increase crop yield and decrease yield variance.