Damage-free measurement method for soil nutrient content based on near infrared spectra technology

Abstract

The invention discloses a nondestructive method for measuring nutrient content in soil based on near-infrared spectral technique. The method comprises two stages of calibration model construction and unknown sample measurement. The calibration model construction stage comprises the following steps of: firstly collecting samples of different soil types as a calibration sample set, scanning to obtain the near-infrared spectra of the calibration sample set, and performing spectra pretreatment to the obtained spectral data; measuring the nutrient content of the samples for model construction with GB method as standard content; and constructing a quantitive relationship between the near-infrared spectra of samples for model construction and standard nutrient content thereof using multivariate calibration algorithm to obtain a calibration model. The unknown sample measurement stage comprises the following steps of: scanning soil samples to be detected to obtain the near-infrared spectra thereof, inputting the spectral data after corresponding spectra pretreatment to the calibration model, and measuring with the calibration model to obtain the content of each nutrient. The whole process is under computer control, and the invention realizes data collection, storage, display and processing functions.

Description

technical field

[0001] The invention relates to a method for non-destructively measuring soil nutrient content based on near-infrared spectrum technology. Background technique

[0002] Mastering the distribution of nutrients in farmland soil is of great significance for guiding agricultural production. In particular, soil nutrient parameters (mainly nitrogen, phosphorus, potassium and organic matter content), which reflect the ability of soil to supply crop growth, are important indicators of soil fertility. Traditional soil nutrient testing methods are time-consuming, labor-intensive, harmful or polluting, and difficult to measure directly in the field. Soil spectral reflectance is one of the basic properties of soil, which is closely related to soil physical and chemical properties. This relationship is the physical basis of soil remote sensing technology, and it also provides a new way to study the properties of soil itself. Near-infrared spectroscopy has been paid att...

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