Application of Regression Isogram to Dynamic Analysis of Soil Moisture Variations With Time and Space

A figure is made according to the following method: taking depth and time as independent variables to establish the binary quadric and binary cubic equations of soil moisture, and then make the figures based on the equations, last, select and use one of the figures in accordance with the correlation coefficients and experience. Using this method, an exhaustive analysis of two examples are made, the results show that the figure has the peculiarities of more information, more visual and easier to analyse.