1. The document introduces a double-wave model for the quantitative analysis of chlorophyll a and chlorophyll b using spectrophotometry. 2. The model establishes quantitative analysis methods for soil and plant analyzer development with three wavebands of information. 3. Using this model, the prediction results of above components were 0.911, 0.912 and 0.898 respectively, and the relative standard errors of prediction were 14.2%, 11.8% and 15.0% respectively.

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