Research Article Open Access

Detection of Soil Total Nitrogen, Phosphorus and Potassium Content Based on the Spectral Information of Citrus Canopy

Lin Yunshuo1, Li Zhen1, Lv Shilei1, Huang Heqing1 and Hu Jiapei1
  • 1 South China Agricultural University, China

Abstract

The content of total nitrogen, phosphorus and potassium in the soil is an important basis for calculating the best fertilization amount and realizing the reasonable fertilization of the orange planting soil in time and accurately. In this research, hyper-spectral technology is applied to detect the three soil nutrient elements in the cultivated soil of citrus trees. Four spectral bands with central wavelengths of 660, 780, 870 and 970 nm and width of 20 nm are selected to measure the spectral reflectance of the potted kumquats canopy by hand-held spectrometer. At the same time, the content of total nitrogen, phosphorus and potassium in the cultivated soil of kumquat is determined using traditional methods. The correlation between the spectral information of kumquat canopy and the content of soil nutrient elements is analyzed by correlation coefficient method. The prediction model of soil nutrient element content based on the spectral information is established by multiple linear regression method. The results showed that the total potassium content of soil is significantly correlated with the spectral reflectance at 660 nm wave band and significantly correlated with the spectral indexes of R660/R780, R660/R870 and R660/R970. R2 of the prediction model of total potassium content established on the basis of spectral reflectance and ratio spectral index of the selected band is 0.756 and 0.857 respectively, which shows good prediction effect of the model. There is no significant correlation between the spectral reflectance and ratio spectral index of the selected band towards the total soil nitrogen and phosphorus content and it cannot be used for the rapid measurement of total nitrogen and phosphorus content. Further study is needed to select suitable spectral band and spectral index.

American Journal of Biochemistry and Biotechnology
Volume 16 No. 2, 2020, 177-183

DOI: https://doi.org/10.3844/ajbbsp.2020.177.183

Submitted On: 24 February 2020 Published On: 17 April 2020

How to Cite: Yunshuo, L., Zhen, L., Shilei, L., Heqing, H. & Jiapei, H. (2020). Detection of Soil Total Nitrogen, Phosphorus and Potassium Content Based on the Spectral Information of Citrus Canopy. American Journal of Biochemistry and Biotechnology, 16(2), 177-183. https://doi.org/10.3844/ajbbsp.2020.177.183

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Keywords

  • Citrus
  • Spectrometer
  • Nutrient Elements
  • Spectral Analysis
  • Fine Agriculture