Soil nitrogen detection pretreatment method based on portable near-infrared spectroscopy

Abstract

The invention discloses a soil nitrogen detection pretreatment method based on a portable near-infrared spectroscopy. The soil nitrogen detection pretreatment method comprises step 1 of soil sample pretreatment: drying a soil sample under 60 to 70 DEG C for at least 12 hours, grinding the soil sample to the particle diameter smaller than or equal to 160mu m after a temperature of the soil sample is cooled to a room temperature and pressing to a cuboid sample; step 2 of utilizing a near-infrared spectrum to detect the cuboid sample to obtain spectral information; step 3 of inputting the spectrum information into a spectral signal and soil nitrogen content relation model to obtain a soil nitrogen content. According to the soil nitrogen detection pretreatment method disclosed by the invention, the soil sample and a urea solution are treated by a series of strict pretreatment operation of fully mixing, drying, grinding, sieving, tabletting and the like; then a near-infrared spectrum is collected to establish the spectral signal and soil nitrogen content relation model, and the nitrogen content in the soil can be obtained according to the relation model; thus, detection accuracy is improved, and a foundation is laid for following agriculture and scientific researches.

Description

technical field [0001] The invention relates to the technical field of soil component detection, in particular to a pretreatment method for soil nitrogen detection based on a portable near-infrared spectrometer. Background technique [0002] Soil is the foundation and an important part of agriculture. The main function of soil is to provide nutrients and water for crops, and it is also a medium for the extension and fixation of crop roots. The content of nutrients such as nitrogen in farmland is an important factor affecting the growth of crops. Quickly obtaining soil nitrogen and other nutrient information is very important for rational and appropriate fertilization and guiding agricultural production. For soil nutrient information, the measurement cycle is long, the process is complicated, and the cost is high, which greatly limits the project promotion and social and economic benefits. [0003] Near-infrared spectroscopy technology is applied to the detection of soil nit...

AI Technical Summary

Problems solved by technology

However, in the actual detection, affected by factors such as soil moisture content, soil particle size, and soil surface roughness, the detection accuracy of nitrogen is not high without pretreatment.

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