Polar Coordinate Yield Evaluation for Crop Nutrient Efficiency
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Solution Overview
Problem
Current methods for evaluating crop nutrient efficiency, such as fertilizer partial productivity, fertilizer agronomic efficiency, fertilizer recovery rate, and nutrient physiological utilization rate, are limited by soil and climate conditions, lack reliability in cross-regional comparisons, and require costly and time-consuming chemical analysis.
Innovation Solution
A polar coordinate-based method using a yield-based polar coordinate system to evaluate nutrient efficiency without chemical component detection, utilizing projection difference and polar angle to assess nutrient efficiency and yield potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If chemical analysis methods (drying, crushing, digestion, chemical stoichiometry) are used to measure nutrient content for calculating fertilizer recovery rate and nutrient physiological utilization rate, then measurement precision is improved, but loss of time and cost increase significantly
Solution Approach 1:
The patent extracts the core evaluation function from complex chemical analysis by using a polar coordinate system that directly relates yield data to nutrient efficiency. This extracts only the necessary information (yield under different nutrient conditions) while eliminating unnecessary processing steps, achieving the evaluation purpose without time-consuming chemical analysis
Solution Approach 2:
The patent creates a mathematical model (polar coordinate system) that copies and represents the complex nutrient efficiency evaluation relationship in a simplified form. Instead of physically analyzing nutrient content through chemical methods, the model copies the essential evaluation function using yield data, achieving the same evaluation purpose much more efficiently
2Ease of operation
If fertilizer partial productivity is used to evaluate nutrient efficiency, then evaluation simplicity is improved, but reliability deteriorates due to significant influence from soil factors and poor cross-regional comparability
Solution Approach 1:
The polar coordinate system serves multiple functions simultaneously: it evaluates nutrient efficiency, accounts for soil conditions, enables cross-regional comparison, and works with different crop varieties. The origin represents average yield of control varieties, automatically adapting to different regions and soil conditions, making the evaluation universally applicable while maintaining simplicity
Solution Approach 2:
The patent changes the evaluation parameters from absolute yield values to relative position in polar coordinate space. By using the origin (average of control varieties) as reference and measuring angular and radial deviations, the system transforms absolute yield data into relative efficiency metrics that are comparable across different regions and soil conditions
Data Source
AI summary
A polar coordinate-based method for evaluating a nutrient efficiency of a crop includes the following steps: establishing a polar coordinate system with a yield of a variety to be tested in a nutrient-deficient plot as a horizontal coordinate, a yield of the variety to be tested in a normal plot as a vertical coordinate, and an average yield of multiple control varieties as an origin; obtaining a polar coordinate of the variety to be tested based on the polar coordinate system established; calculating a projection difference based on polar coordinate data of the variety to be tested; and evaluating a nutrient efficiency of the variety to be tested through the projection difference. The polar coordinate-based method can realize accurate and rapid evaluation of the nutrient efficiency of the crop without chemical component detection and has advantages of low cost, easy operation, and comparable results in different plots.