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Prediction of macronutrients in plant leaves using chemometric analysis and wavelength selection

Abstract

Purpose

Fast and real-time prediction of leaf nutrient concentrations can facilitate decision-making for fertilisation regimes on farms and address issues raised with over-fertilisation. Cacao (Theobroma cacao L.) is an important cash crop and requires nutrient supply to maintain yield. This project aimed to use chemometric analysis and wavelength selection to improve the accuracy of foliar nutrient prediction.

Materials and methods

We used a visible-near infrared (400–1000 nm) hyperspectral imaging (HSI) system to predict foliar calcium (Ca), potassium (K), phosphorus (P) and nitrogen (N) of cacao trees. Images were captured from 95 leaf samples. Partial least square regression (PLSR) models were developed to predict leaf nutrient concentrations and wavelength selection was undertaken.

Results and discussion

Using all wavelengths, Ca (R2CV = 0.76, RMSECV = 0.28), K (R2CV = 0.35, RMSECV = 0.46), P (R2CV = 0.75, RMSECV = 0.019) and N (R2CV = 0.73, RMSECV = 0.17) were predicted. Wavelength selection increased the prediction accuracy of Ca (R2CV = 0.79, RMSECV = 0.27) and N (R2CV = 0.74, RMSECV = 0.16), while did not affect prediction accuracy of foliar K (R2CV = 0.35, RMSECV = 0.46) and P (R2CV = 0.75, RMSECV = 0.019).

Conclusions

Visible-near infrared HSI has a good potential to predict Ca, P and N concentrations in cacao leaf samples, but K concentrations could not be predicted reliably. Wavelength selection increased the prediction accuracy of foliar Ca and N leading to a reduced number of wavelengths involved in developed models.

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Acknowledgements

The authors acknowledge Professor Helen Wallace for giving access to Hyperspectral Imaging cameras at the University of the Sunshine Coast and the National Agricultural Research Institute (NARI) in Keravat for assisting to collect leaf samples. MM thanks Environmental Future Research Institute of Griffith University for hosting him as a visiting scholar to undertake this study.

Funding information

The study was financially supported by the Australian Centre for International Agricultural Research (project FST/2014/099).

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Correspondence to Shahla Hosseini Bai.

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Malmir, M., Tahmasbian, I., Xu, Z. et al. Prediction of macronutrients in plant leaves using chemometric analysis and wavelength selection. J Soils Sediments 20, 249–259 (2020) doi:10.1007/s11368-019-02418-z

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Keywords

  • Cacao trees
  • Calcium
  • Chemometric analysis
  • Nitrogen
  • NPK
  • Phosphorus
  • Potassium