Microbial Coated Fertilizer Pellets for Nutrient Retention
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Solution Overview
Problem
Conventional fertilizers often face issues with bioavailability and efficient nutrient release, leading to suboptimal plant uptake and soil health, while microbial fertilizers have limitations in sustained activity and compatibility with chemical fertilizers.
Innovation Solution
Development of multi-component fertilizer compositions incorporating a core particle coated with a polymer or wax layer, including one or more species of microbes, which are strategically positioned between or within these layers to enhance nutrient bioavailability and microbial activity over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional chemical fertilizers are used, then immediate nutrient availability is achieved, but nutrient loss through leaching and denitrification increases
Solution Approach 1:
The patent embeds microbial cells within the polymer coating matrix of controlled-release fertilizers, creating a nested structure where microbes are trapped inside the coating layers. This nesting approach allows the fertilizer core to release nutrients while the embedded microbes remain protected and active, converting nitrogen to forms that reduce leaching loss.
Solution Approach 2:
The invention creates a composite fertilizer system combining chemical fertilizer (urea or ammonium nitrate), polymer coating materials, and living microbial cells. This composite structure allows simultaneous functions: controlled nutrient release from the fertilizer core, protection from leaching by the polymer matrix, and biological conversion by the embedded microbes.
2Loss of substance
If controlled-release fertilizers with polymer coating are used, then nutrient release is controlled and leaching is reduced, but microbial activity is limited
Solution Approach 1:
The patent modifies the polymer coating parameters by incorporating hydrophilic groups and adjusting cross-linking density to create pathways for oxygen and nutrient diffusion. This parameter adjustment allows the coating to maintain its controlled-release function while simultaneously permitting microbial respiration and metabolic activity.
Solution Approach 2:
The polymer coating is designed with a porous or semi-permeable structure that allows selective passage of gases (oxygen, carbon dioxide) and small molecules (nutrients, metabolites). This porosity enables microbial cells embedded in the coating to remain metabolically active while the coating still provides controlled-release functionality.
3Adaptability or versatility
If multiple fertilizer components are combined, then nutrient spectrum is improved, but formulation complexity increases
Solution Approach 1:
The patent merges multiple functional components (fertilizer, polymer coating, microbes) into a single integrated pellet structure. This merging eliminates the need for separate application of chemical fertilizers and microbial inoculants, simplifying the overall formulation and application process while providing combined benefits.
Solution Approach 2:
The polymer coating serves multiple functions simultaneously: controlling nutrient release rate, protecting embedded microbes from desiccation and UV damage, facilitating microbial respiration through gas permeability, and preventing nutrient leaching. This multi-functionality reduces the need for additional separate components.
Data Source
AI summary
Compositions including a core particle including at least one fertilizer nutrient and a shell substantially covering the core particle, wherein the shell includes at least one polymer layer or wax layer and one or more species of microbes (such as a population of cells from at least one species of microbes) are provided. In some embodiments, at least one of the polymer layer and/or the wax layer includes the one or more species of microbes. In other examples, the one or more species of microbes are included between layers, for example, between two polymer layers, between two wax layers, or between a polymer layer and a wax layer. Methods of preparing the compositions are also provided. Methods of using the disclosed compositions that include contacting soil, plants, plant parts, or seeds with the composition are provided.