Monitoring of cadmium content in sweet potato based on hyperspectral analysis

doi:10.16178/j.issn.0528-9017.20240192

Abstract

Abstract:

The rapid detection of cadmium is of great significance for the high-quality and safe production of sweet potatoes. This experiment used five sweet potato varieties, Xinxiang, Shulv 1, Guangshu 87, Zheshu 13, and Shangshu 19, for pot cultivation. By setting five different contents of cadmium treatment gradients, the characteristics of cadmium absorption and accumulation in sweet potatoes were explored. The results showed that the heavy metal cadmium content in sweet potato leaves and root tubers showed an upward trend with the increase of soil cadmium content. By analyzing the spectral reflectance characteristics of sweet potato leaves, key spectral bands closely related to cadmium content were identified, and two sensitive bands (830 and 910 nm) with the strongest correlation with leaf cadmium content and normalized vegetation index (NDVI) were determined within these bands. A quantitative estimation model for heavy metal content in sweet potato leaves was constructed based on the NDVI index,achieving real-time monitoring and accurate diagnosis of cadmium content in sweet potato plants.

Key words: sweet potato, cadmium, absorption, accumulation, spectrum, estimation model

CLC Number:

S531

CHEN Yu, SHU Xing, BAI Jiacheng, LYU Zunfu. Monitoring of cadmium content in sweet potato based on hyperspectral analysis[J]. Journal of Zhejiang Agricultural Sciences, 2025, 66(6): 1471-1476.

Figures/Tables 7

Fig.1 Dry weight of sweet potato root tubers

Fig.2 Stem weight of sweet potato

Fig.3 Content of heavy metal cadmium in sweet potato leaves

Fig.4 Content of heavy metal cadmium in sweet potato root tubers

Fig.5 Results of spectral reflectance curve of leaves in Xinxiang

Fig.6 The equipotential plot of the determination coefficient between NDVI values and cadmium content in any two bands

Fig.7 Relationship between NDVI value and cadmium content in sweet potato leaves

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