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Dynamic weighing method is an ideal method for dynamic detection of application rate of fertilization and seeding, because the application is not limited by the measurement object and can directly obtain dynamic information. But it is difficult to be applied in practice because of its easily being interfered by environmental vibration. An application rate measuring device, where the supporting force from high-pressure nitrogen springs and the pulling force from S-type weighting sensors was combined for detection, was adopted in this research. A functional application rate detection method was proposed based on the complementary characteristics of the measuring device with opposite direction and proportional amplitude between the pressure and tension. In this method, a function with application rate function as a variable was constructed, and the target application rate function was finally determined by calculating the extreme value of the function. Eighteen groups of experiments, with a wheat seedfertilizer drill machine on a slight potholes cement road, were carried out at different target application rates (225kg/hm2, 300kg/hm2 and 375kg/hm2) and at different vehicle speeds (3km/h, 5km/h and 3~7km/h). And the dynamic and cumulative application rate were measured with the functional detection method. The maximum, average and standard deviation of the absolute relative error of cumulative application rate were 5.61%, 2.26% and 1.58%, respectively. After exceeding 0.033 hm2 of operation area, the maximum absolute relative deviation of the dynamic application rate was 9.61% in all tests, and the maximum average absolute relative deviation and maximum standard deviation were 4.73% and 1.97% in one test. The experimental results showed that the functional detection method can effectively obtain the dynamic and cumulative information of application rate, but the construction method of the function needed further research.