摘要：AbstractIn order to explore the method for rapid detection of soil total nitrogen (TN) content, a vehicle-mounted soil total nitrogen detector was developed, and the working performance of vehicle-mounted soil total nitrogen detector was analyzed at different vehicle speeds. The TAISHAN-TS404 wheeled tractor was used as the vehicle platform, the soil total nitrogen detector connected with the vehicle platform by the triangular. Four speeds were set up in field experiments, which were S1 (0.56m/s), S2 (0.88m/s), S3 (1.06m/s) and S4 (1.76m/s). The spectral data of seven soil total nitrogen sensitive wavelengths were collected. Meanwhile, the GPS position information was obtained and the soil total nitrogen was measured by laboratory method. The smoothness and dispersion of spectral data at the seven sensitive wavelengths collected at different speeds were analyzed. The correlation between the measured spectral data of seven soil total nitrogen sensitive wavelengths and soil total nitrogen was calculated. The results showed that the smoothness and dispersion of spectral data at the seven sensitive wavelengths were better at S1, S2 and S3 velocities than at S4 velocities. At the same time, the correlation coefficients of spectral data at seven sensitive wavelengths (1070, 1130, 1245, 1375, 1470, 1550 and 1680 nm) and soil total nitrogen were both reach more than 0.45 at S1, S2 and S3 velocities. Finally, MLR models for the diagnosis of the soil total nitrogen content were established at different speeds of S1, S2 and S3, respectively. The accuracy of the model can meet the requirements of soil parameters space distribution map. In order to further improve the diagnostic efficiency of the soil total nitrogen in the field, the data of different speeds were combined to establish MLR model of soil total nitrogen index. The results show that the model was universal. This research can provide support for rapid diagnosis of field soil nutrition parameters.
关键词：KeywordsSoil total nitrogenSensitive wavelengthVehicle-mountedDifferent speedQuick diagnosis
