Pyroxasulfone Columnar Crystals for Weed Control in Sandy Soil

Solution Overview

Problem

Soil treatment with pyroxasulfone exhibits variable herbicidal effects due to environmental conditions such as soil type and rainfall, and the crystal form of pyroxasulfone affects its wettability and redispersibility but not its herbicidal efficacy.

Innovation Solution

Applying columnar crystals of pyroxasulfone to soils with a clay content of less than 15% and a sand content of not less than 65%, along with specific agrochemical formulations like wettable powders or suspensions, under conditions of cumulative rainfall exceeding 15 mm within the first 7 days post-treatment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If pyroxasulfone is applied to soil with varying environmental conditions, then the herbicidal effect varies, but maintaining consistent efficacy under different conditions is difficult

Engineering Contradiction:

Improveherbicidal effect consistencyVSAvoidenvironmental condition variability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent changes the physical parameter of pyroxasulfone from conventional powder form to columnar crystal form, which fundamentally alters how the herbicide interacts with soil particles and water. This parameter change results in consistent herbicidal efficacy across varying environmental conditions including different soil types and rainfall amounts, resolving the contradiction between reliability and adaptability

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If pyroxasulfone crystal form is changed, then wettability and redispersibility are improved, but herbicidal efficacy remains unchanged

Engineering Contradiction:

Improvewettability and redispersibilityVSAvoidherbicidal efficacy

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent changes the physical parameter of pyroxasulfone from conventional powder form to columnar crystal form, which fundamentally alters how the herbicide interacts with soil particles and water. This parameter change results in consistent herbicidal efficacy across varying environmental conditions including different soil types and rainfall amounts, resolving the contradiction between reliability and adaptability

Inventive Principle:

Principle #35Parameter changes

3Duration of action of stationary object

If soil treatment is performed with conventional pyroxasulfone formulations, then long-term pest control is achieved, but herbicidal effect decreases under certain soil and rainfall combinations

Engineering Contradiction:

Improvepest control periodVSAvoidherbicidal effect stability

Core Design Contradiction:

Duration of action of stationary objectVSReliability

Solution Approach 1:

The patent changes the physical parameter of pyroxasulfone from conventional powder form to columnar crystal form, which fundamentally alters how the herbicide interacts with soil particles and water. This parameter change results in consistent herbicidal efficacy across varying environmental conditions including different soil types and rainfall amounts, resolving the contradiction between reliability and adaptability

Inventive Principle:

Principle #35Parameter changes

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

This method provides a high and consistent herbicidal effect by optimizing the soil conditions and formulation of pyroxasulfone, enhancing its efficacy in weed control.

Implementation Method 1

Pyroxasulfone is known to exhibit high herbicidal effect on grass weeds... and to have a broad herbicidal spectrum

Methodology Applied

Scientific EffectHerbicidal effect:

Data Source

PatentUS20240138412A1Method for controlling weeds

Publication Date: 2024.05.02 KUMIAI CHEM IND CO LTD

AI summary

A more effective weed control method is provided for a case where soil treatment with pyroxasulfone is carried out. The present invention provides a weed control method in which treatment with columnar crystals of pyroxasulfone is carried out for soil with a composition having a clay content of less than 15% and a sand content of not less than 65%.