A portable soil nutrient detection system and method

Abstract

The invention provides a portable soil nutrient detection system and a method. A miniature sample room provides the detection process with an enclosed space and pressure environment, and is respectively in optical connection with a laser optical path and a spectral collection optical path through an optical window. A laser emits laser; a spectral collection conversion module collects a plasma state optical signal generated when soil to be detected is irradiated by laser, generates a characteristic spectral signal according to the optical signal and converts the characteristic spectral signal to a digital signal; and a signal processing module obtains spectral intensity signals corresponding to various elements in the soil to be detected according to the digital signal and calculates contents of various elements in the soil to be detected according to the spectral intensity signals. According to the invention, nutrient elements in the soil can be detected continuously and rapidly, the influence of air on detection results is obviously reduced, and detection effect of elements such as nitrogen (N), phosphor (P) and carbon (C), etc. can be enhanced. The system of the invention is simple, small and portable, and can provide a powerful tool for spot rapid detection and calibration of soil.

Description

technical field [0001] The invention relates to the field of soil nutrient detection, in particular to a portable soil nutrient element detection system and method. Background technique [0002] Soil is the basis for human survival and development, and soil nutrients are important indicators that affect soil health and ecosystem productivity. Soil nutrients are also closely related to soil organic matter and soil structure. Soil nutrients are not only the main source of nitrogen, phosphorus, potassium, and sulfur elements required for plant growth, but also closely related to soil heavy metals and organic pollutants. Its content is an important indicator of soil fertility level. Therefore, accurate and rapid measurement of soil nutrients is of great significance for the rational use of soil resources and the establishment of a virtuous cycle of land ecosystems. [0003] The composition of soil nutrients includes not only nitrogen (N), phosphorus (P), potassium (K) and oth...

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Problems solved by technology

In the prior art, for the detection of the main elements in soil nutrients, traditional laboratory chemical analysis methods are expensive, time-consuming and laborious, and require high-quality operators; traditional rapid measurement methods, such as spectrophotometry, atomic absorption, etc. , the sample needs to be processed in advance, which takes a long time, the steps are cumbersome, and it is easy to introduce interference; although the near-infrared spectroscopy method does not require chemical reagents and the sample preparation is simple, the establishment of the chemometric model is relatively complicated, and the detection of medium and trace elements The effect is very poor, and it is not suitable for the independent detection of medium and trace elements; X-ray fluorescence spectrometry is better for the detection of heavy metal elements in soil, but for light elements, such as nitrogen (N), phosphorus (P), potassium ( The detection effect of K), (Ca), magnesium (Mg), sulfur (S), etc. is very poor

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