Fig. 6

Regression scatter diagram of using different model fusions. The first row of images are the scatter plots of the prediction results using pristine soil data, the second row of images are the resulting scatter plots of using sieved data with the particle size of 0.15–0.25mm, the third row are the scatter plots of regression results using model fusion method and sieved data, and the last row are the scatter plots of regression results using six group data and model fusion method