Sulfur-Based Nitrification Inhibitors for Fertilizer Compatibility
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Solution Overview
Problem
Conventional nitrification inhibitors are toxic, affect soil microbiome health, and are not compatible with standard fertilizers, leading to inefficient nitrogen use and environmental pollution.
Innovation Solution
Application of polysulfides, thiosulfates, and hydrosulfides as nitrification inhibitors in specific ratios and concentrations to directly contact ammonium-containing or producing fertilizers, maintaining soil health and inhibiting nitrification without affecting microbial activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional nitrification inhibitors (DCD, nitrapyrin) are used to inhibit soil nitrification, then nitrogen loss is reduced, but they are toxic to soil microbiome and affect soil health
Solution Approach 1:
The patent employs naturally occurring sulfur compounds (polysulfides, thiosulfates, hydrosulfides) that are biodegradable and non-toxic to soil microbiome, replacing persistent synthetic inhibitors. These sulfur-based inhibitors break down into harmless sulfate, providing temporary nitrification inhibition without long-term toxic effects on soil health.
Solution Approach 2:
The patent changes the chemical nature of nitrification inhibitors from synthetic compounds (DCD, nitrapyrin) to sulfur-based compounds with different chemical properties. The sulfur compounds inhibit nitrification through a different mechanism that does not involve toxicity to microorganisms, thereby maintaining soil microbiome health while achieving nitrogen conservation.
2Productivity
If conventional nitrification inhibitors are applied, then nitrogen use efficiency improves, but compatibility with standard fertilizers is poor
Solution Approach 1:
The sulfur-based compounds serve multiple functions: they act as nitrification inhibitors, provide sulfur nutrition to crops, and are compatible with various fertilizer forms (granular, liquid, urea, ammonium nitrate). This multi-functionality eliminates the need for separate inhibitor applications and ensures broad compatibility with standard fertilizer products.
Solution Approach 2:
The patent combines nitrification inhibition function with sulfur nutrition in a single compound application. The sulfur compounds are applied together with nitrogen fertilizers, merging two separate functions (inhibition and nutrition) into one integrated solution that improves nitrogen use efficiency while maintaining fertilizer compatibility.
3Productivity
If nitrogen fertilizer is applied to increase crop yield, then productivity improves, but environmental pollution increases due to leaching and denitrification
Solution Approach 1:
The sulfur-based compounds are applied simultaneously with or before nitrogen fertilizer to pre-inhibit nitrification. This preliminary action prevents the conversion of ammonium to nitrate before leaching can occur, thereby reducing nitrogen losses to water bodies and atmospheric emissions while maintaining crop productivity.
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
Significantly reduces nitrification, improves nitrogen use efficiency, and maintains soil microbiome health, reducing environmental emissions and regulatory compliance costs.
Implementation Method 1
The ammonium oxidizing enzymes in question (that convert ammonium into nitrite) are ammonium monooxygenase (AMO) and hydroxylamine oxidoreductase (HAO).
Implementation Method 2
Thiosulfates readily oxidize to dithionates, trithionates, tetrathionates, and finally to sulfates
Data Source
Figure 1
AI summary
The present invention relates to a process for inhibiting, at least in part, nitrification activity of ammonium-containing fertilizers (a1) and/or of ammonium-producing fertilizers (a2), which process comprises the steps of: a) Applying to soil and/or to foliage a nitrification inhibitory amount of one or more compounds (b) that are selected from the group consisting of (b1) polysulfides and/or (b2) thiosulfates and/or (b3) hydrosulfides; b) Wherein the one or more compounds (b) are applied simultaneously with, before or after the fertilizers (a) are applied to the soil and/or to the foliage such that the compounds (b) are in direct contact with the ammonium-containing fertilizers (a1) and/or the ammonium-producing fertilizers (a2); c) Wherein the one or more nitrification inhibiting compounds (b) are applied in an amount: i. such that the ratio (w/w) of "total protectable nitrogen"over "sulfur from compounds (b)" is at most about 8:1, preferably at most about 7.5:1, more preferably at most about 7:1, and/or, ii. corresponding to a soil level of S (sulfur) that is between about 50 and about 300 ppm, preferably between about 75 and about 300 ppm, more preferably between about 100 and about 250 ppm; and d) Wherein compounds (b) are different from compounds (a).