Fertilizer Composition with Acid for Hard Water Irrigation
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Solution Overview
Problem
The limited solubility of polyvalent cation-polyoxy anion salts, particularly calcium and magnesium phosphate salts, reduces fertilizer effectiveness in agricultural irrigation systems and causes clogging issues when mixed with hard water, leading to inefficient fertilizer delivery and equipment plugging.
Innovation Solution
A method involving a concentrated fertilizer composition with ammonium phosphate or ammonium sulfate and an acid component, such as citric acid, is used to inhibit the formation of insoluble precipitates when mixed with hard water, allowing for effective fertilizer application without clogging irrigation systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phosphate fertilizer is applied to hard water for irrigation, then fertilizer effectiveness is reduced, but precipitation and clogging of irrigation system components occurs
Solution Approach 1:
The patent introduces an intermediary substance (sequestrant or acidifying agent) that mediates between the phosphate fertilizer and hard water. This intermediary binds to polyvalent cations or acidifies the solution, preventing direct reaction between phosphate and calcium/magnesium ions, thus eliminating precipitation while maintaining fertilizer effectiveness.
Solution Approach 2:
The patent changes the chemical parameters of the irrigation solution by adding acidifying agents to lower pH or sequestrants to alter cation availability. This parameter change prevents the formation of insoluble phosphate salts by keeping the solution chemistry unfavorable for precipitation, thereby resolving both fertilizer effectiveness and clogging issues.
2Reliability
If concentrated fertilizer composition with acid component is used, then precipitate formation is inhibited, but additional chemical components are required
Solution Approach 1:
The patent merges multiple functions into a single fertilizer composition: the concentrated phosphate fertilizer, the acidifying agent or sequestrant, and the appropriate concentration for irrigation are all combined in one formulation. This eliminates the need for separate additives and simplifies the overall system while maintaining precipitate inhibition.
Solution Approach 2:
The patent creates a universal fertilizer composition that serves multiple functions simultaneously: providing phosphate nutrition, preventing precipitation through included acidifying agents or sequestrants, and being ready-to-use for irrigation without additional modifications. This multi-functionality reduces system complexity despite the enhanced composition.
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 use of citric acid and other carboxylic acids significantly reduces the formation of insoluble precipitates, maintaining fertilizer solubility and preventing equipment clogging, enabling the use of local hard water sources and reducing shipping costs by using lower-volume, concentrated fertilizers.
Implementation Method 1
The use of citric acid and other carboxylic acids significantly reduces the formation of insoluble precipitates, maintaining fertilizer solubility
Data Source
AI summary
A method for applying an agricultural fertilizer to a field through an irrigation system connected to a source of hard water, includes providing a fertilizer composition comprising a mixture of (i) a fertilizer component comprising an ammonium phosphate or an ammonium sulfate, and (ii) an acid comprising one or more of a phosphoric acid, a citric acid, a malic acid, a formic acid, and an oxalic acid; combining the fertilizer composition with hard water from the hard water source and providing the mixture to an irrigation system; and using the irrigation system to apply the mixture of fertilizer composition and hard water to the field.