Aprotic Solvating System for Urea Fertilizer Inhibitor Stability
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Solution Overview
Problem
Current fertilizer formulations face challenges in maintaining consistent nitrogen levels in soil due to volatilization and runoff, leading to environmental pollution and increased costs, as existing methods often result in clumping or degradation of urease and nitrification inhibitors.
Innovation Solution
A liquid formulation using aprotic solvating systems with urease and nitrification inhibitors, such as N-(n-butyl) thiophosphoric triamide and dicyandiamide, is applied directly to fertilizer granules or soil, providing stability and preventing clumping, while maintaining effective inhibitor levels and reducing nitrogen loss through microbial mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If urease and nitrification inhibitors are added to liquid fertilizers through aqueous solution, then nitrogen retention is improved, but the inhibitors degrade and cause clumping
Solution Approach 1:
The patent changes the solvent parameter from aqueous (water-based) to organic solvent-based formulation. This parameter change prevents inhibitor degradation while maintaining nitrogen retention benefits, as the organic solvent system does not cause the clumping and degradation issues associated with aqueous solutions.
Solution Approach 2:
The patent introduces an organic solvent as an intermediary medium to deliver the urease and nitrification inhibitors to the fertilizer. This intermediary solvent system enables effective inhibitor delivery without the harmful effects of direct aqueous application, mediating between the need for nitrogen retention and inhibitor stability.
2Reliability
If fertilizer is applied frequently to maintain nitrogen levels, then consistent nitrogen availability is achieved, but costs increase and environmental pollution worsens
Solution Approach 1:
The patent applies preliminary action by incorporating both urease and nitrification inhibitors into the liquid fertilizer formulation before application. This pre-combined inhibitor system provides extended nitrogen retention, reducing the frequency of applications needed to maintain consistent nitrogen levels, thereby lowering costs and environmental impact.
Solution Approach 2:
The patent merges two different inhibitor types (urease and nitrification inhibitors) into a single liquid fertilizer formulation. This combination provides synergistic nitrogen retention effects, simultaneously addressing multiple nitrogen loss pathways and extending the effectiveness period between fertilizer applications.
3Productivity
If nitrogen content in soil is increased through fertilizer application, then crop yield is improved, but nitrogen loss through volatilization and runoff increases
Solution Approach 1:
The patent converts the potentially harmful rapid decomposition of urea (which causes volatilization and runoff) into a beneficial controlled-release system. By using urease inhibitors to slow down urea breakdown, the nitrogen is released gradually in forms plants can absorb, improving yield while reducing pollution from rapid nitrogen loss.
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 solution enhances nitrogen longevity in soil, reduces the frequency of fertilizer applications, lowers costs, and minimizes environmental pollution by ensuring consistent nitrogen availability and preventing nitrogen loss, thereby improving soil health and reducing water and atmospheric pollution.
Implementation Method 1
A liquid formulation using aprotic solvating systems with urease and nitrification inhibitors, such as N-(n-butyl) thiophosphoric triamide and dicyandiamide, is applied directly to fertilizer granules or soil, providing stability and preventing clumping
Implementation Method 2
Loss due to volatilization is sometimes driven by a urease enzyme that catalyzes hydrolysis of urea to ammonia and carbon dioxide
Implementation Method 3
Loss due to volatilization is sometimes driven by a urease enzyme that catalyzes hydrolysis of urea to ammonia and carbon dioxide
Implementation Method 4
Biological oxidations by soil microbes, such as Nitrosomonas bacteria, of ammoniacal nitrogen to nitrate nitrogen are also a cause of the diminishing nitrogen content in soil over time
Data Source
Figure 1
AI summary
Increasing l ongevity of the nitrogen content of soil through improved liquid delivery formulations of urease inhibitors and/or nitrification inhibitors designed to apply to fertilizers, especially urea and manure based fertilizers. These delivery formulations provide an environmentally sound and inherently safe solvating system that improves the storage stability of the urease inhibitors by utilizing aprotic solvents, maintain the urease inhibitors and/or nitrification inhibitors in solution to storage temperatures of at least 10 °C and provides improved application to fertilizer of urease aud/or nitrification inhibitors. These delivery formulations enable safe storage, transport and subsequent application or blending with urea based or manure based fertilizers that can be applied to soil in either a liquid or granular form to provide improved nitrogen retention in the soil for uptake for plant life.