Abstract
In the sugarcane industry, the SIX EASY STEPS nutrient management guidelines were developed to recommend nitrogen (N) fertiliser rates based on soil organic carbon (SOC) content. In this study, various models of topsoil (0–0.3 m) SOC predictions were compared for digital soil mapping (DSM), including geostatistical models [e.g., multiple linear regression (MLR)] and their hybrid models which include regression residuals. Digital data including electromagnetic induction and gamma-ray (γ-ray) spectrometry are studied with different calibration (i.e., n = 165, 150, … , 15) and validation sites (i.e., n = 55). To reduce the SOC measurements, a visible-near infrared (Vis–NIR) library was developed from a number of calibration samples (i.e., n = 15, 30, …, 150) with the prediction of SOC on the remaining samples to the maximum (165). For the full dataset (165), all non-hybrid models produce Lin’s concordance correlation coefficient moderate agreement between predicted and measured SOC (0.65–0.80), and most hybrid models had a substantial agreement (> 0.80). As for the least calibration samples, only 75 were required to achieve near substantial agreement using the hybrid model of MLR. In comparison, only 60 SOC measurements are needed when using a Vis–NIR library to predict another 105 samples, which enable a substantial agreement. There was not much cost difference of N fertiliser application among different sample sizes, but DSM by using the hybrid model of MLR and 75 calibration samples will lead to around 36% cost reduction compared to average industry rate.
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Acknowledgements
The Australian Federal Government’s Sugar Research Australia (SRA) is acknowledged for the financial support to conduct the γ-ray and EM surveys, soil sampling, and laboratory analysis as part of project (2017/014) entitled "Seeing is believing: managing soil variability, improve crop yield and minimising off-site impacts in sugarcane using digital soil mapping". The first author acknowledges a University of New South Wales “University International Postgraduate Award (UIPA)” scholarship which supported his Ph.D. candidature. We also thank Luke Venables, Sam Lemari, and Dion Cawthorne who carried out the soil sampling, Michael Sefton, Rod Nielson from Herbert Cane Productivity Services Ltd., for technical support with proximal sensed digital data collection. We acknowledge farmers who provided unrestricted access to the study fields.
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X.Z.: Formal analysis, Visualisation, writing original draft. J.W.: Methodology. D.Z.: Methodology. J.T.: Supervision, Writing-review & editing.
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Zhao, X., Wang, J., Zhao, D. et al. Soil organic carbon prediction by multi-digital data fusion for nitrogen management in a sugarcane field. Nutr Cycl Agroecosyst 127, 119–136 (2023). https://doi.org/10.1007/s10705-022-10233-1
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DOI: https://doi.org/10.1007/s10705-022-10233-1