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Digital soil mapping and crop modeling to define the spatially-explicit influence of soils on water-limited sugarcane yield

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Abstract

Background and Aims

To enhance Brazilian sugarcane production sustainably, crop simulation models have been utilized. However, due to the lack of reliable information, particularly concerning soil variability, these models have shown limited performance for specific analyses. This study aims to evaluate Digital Soil Mapping (DSM) as an alternative for filling soil data gaps in crop modeling and to assess the influence of these products on prediction uncertainties. The study site is located in Piracicaba region, Southern Brazil.

Methods

The framework was: (i) a legacy soil data were utilized, and equal-spline equations were applied to standardize the dataset.; (ii) a machine learning (ML) algorithm was used to predict soil attributes and their uncertainties; (iii) pedotransfer functions were applied to obtain soil hydrological properties; (iv) DSSAT/CANEGRO crop model was used to estimate sugarcane yield; (iv) a legacy soil map (LSM), SoilGrids (SG) and a map of attributes derived from regional DSM (RDSM) were compared; (v) a Monte Carlo Simulation (MCS) was conducted with the RDSM maps to evaluate the impact of uncertainties in the estimation of sugarcane yield.

Results

The DSM proved to be a reliable source for use in crop models, reaching similar results to field data. The sugarcane yield map emphasized the model’s sensitivity to soil attributes, with texture and depth significantly impacting yield estimations.

Conclusion

In this sense, coupling DSM and crop modeling is a feasible way to improve yield estimates, especially in countries with limited soil databases.

Highlights

• Crop simulation models have limited application due to the lack of soil data.

• Digital Soil Mapping was coupled to a sugarcane simulation model to fill the gap of soil information.

• Soil attributes and their uncertainties were predicted on a 250-m grid using machine learning algorithm.

• A spatially-explicit DSSAT/CANEGRO model was able to represent variations in sugarcane yield at the regional scale;

• Sugarcane yield was strongly affected by soil variability and its uncertainties;

• Our finds indicate the importance of detailed soil databases and their impact on yield predictions.

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Acknowledgements

The authors would like to thank the Coordination for the Improvement of Higher Education Personnel for the first author scholarship and the São Paulo Research Foundation (FAPESP) for the scholarship of the second author and foundation support. We also thank the Geotechnologies on Soil Science Group - GEOCIS (esalqgeocis.wixsite.com/English). The authors also thank the joint project of Raízen Company with the Luiz de Queiroz Agricultural Studies Foundation. The authors dedicate this article to the memory of Paulo Cesar Sentelhas, who will always be remembered for his teachings as a professor and his contributions to the agrometeorology community.

Funding

This research was funded the Coordination for the Improvement of Higher Education Personnel (CAPES – Finance Code 001), the São Paulo Research Foundation (FAPESP) (Grants nº 2014-22262-0; 2018/23760-4) and the project of Raízen Company with the Luiz de Queiroz Agricultural Studies Foundation (Grant nº 87017).

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Authors and Affiliations

Authors

Contributions

Natasha Valadares dos Santos and Rodnei Rizzo contributed to the study conception and design. Material preparation, data collection and analysis were performed by Natasha Valadares dos Santos, Rodnei Rizzo and Henrique Boriolo Dias. The first draft of the manuscript was written by Natasha Valadares dos Santos, Rodnei Rizzo, Henrique Boriolo Dias, Paulo Cesar Sentelhas and José Alexandre Melo Demattê.All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to José A. M. Demattê.

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The authors have no conflicts of interest to declare.

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dos Santos, N.V., Rizzo, R., Dias, H.B. et al. Digital soil mapping and crop modeling to define the spatially-explicit influence of soils on water-limited sugarcane yield. Plant Soil (2024). https://doi.org/10.1007/s11104-024-06587-w

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