Herbicidal Composition with S-Metolachlor, Metribuzin, and Cloransulam-Methyl
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Solution Overview
Problem
Existing herbicidal compositions are ineffective against broadleaf weeds, particularly large seeded broadleaf weeds, and often result in crop injury due to weed resistance and inadequate targeted action.
Innovation Solution
A herbicidal composition comprising S-metolachlor, metribuzin, and cloransulam-methyl, which is effective against a range of weeds including large seeded broadleaf weeds, while maintaining high crop safety and compositional stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a solitary herbicide is used, then the composition is simple and cost-effective, but effectiveness against resistant weeds and broadleaf weeds is insufficient
Solution Approach 1:
The patent combines three herbicides with different modes of action (S-metolachlor for grasses, metribuzin for broadleaf weeds, and cloransulam-methyl for post-emergence broadleaf control) into a single composition. This merging approach allows the formulation to effectively control multiple weed types including resistant broadleaf weeds while maintaining practical application simplicity.
Solution Approach 2:
The composition is designed to perform multiple functions: controlling annual grasses, small-seeded broadleaf weeds, and large-seeded broadleaf weeds through the synergistic action of three herbicides. This multi-functionality addresses the versatility requirement while maintaining a single application formulation.
2Adaptability or versatility
If herbicidal activity is increased to control broadleaf weeds, then weed control efficacy improves, but crop safety and compositional stability deteriorate
Solution Approach 1:
The patent optimizes the concentration parameters of each herbicide component within specific ranges (S-metolachlor: 15-55% w/w, metribuzin: 1-20% w/w, cloransulam-methyl: 0.01-10% w/w) to achieve effective broadleaf weed control while maintaining crop safety and compositional stability. These parameter optimizations allow the formulation to target resistant weeds without compromising reliability.
3Measurement precision
If the composition targets specific weed types, then weed control precision improves, but effectiveness against resistant weeds deteriorates
Solution Approach 1:
The patent segments the weed control function into three distinct herbicidal components, each targeting specific weed groups: S-metolachlor for grasses, metribuzin for broadleaf weeds, and cloransulam-methyl for post-emergence broadleaf control. This segmentation allows precise targeting of different weed types while the combination provides effectiveness against resistant weeds through diversified modes of action.
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 composition demonstrates excellent weed control efficacy against broadleaf and grass weeds without harming crops, maintaining yield, and showing remarkable physical and chemical stability across various conditions.
Implementation Method 1
Metribuzin is an herbicide used both pre- and post-emergence in crops and acts by inhibiting photosynthesis by disrupting photosystem II
Implementation Method 2
Such compositions must also demonstrate both a high level of both crop safety and physical properties, such as compositional stability
Data Source
AI summary
A herbicidal composition comprising S-metolachlor, metribuzin and cloransulam-methyl.