UAV multispectral sensing and data-driven modeling for precision onion yield prediction.

Abstract

The integration of unmanned aerial vehicle (UAV)-assisted remote sensing with the Internet of Things (IoT) and Internet of Everything (IoE) offers a robust platform for optimizing precision agriculture by capturing spatiotemporal variability in crop growth. In this context, the present study aimed to predict the bulb yield of rainy-season onion crops across four staggered planting dates using UAV-based multispectral imagery. Canopy reflectance mosaics acquired at key growth stages, along with vegetation indices (VIs), viz. NDVI, NDRE, SAVI, LAI, NORM2, and GNDVI, were extracted for yield modeling. Yield prediction models at three onion growth stages were developed and assessed using five machine learning algorithms: linear regression (lm), random forest (rf), support vector machine with radial kernel (svmRadial), gradient boosting (gbm), and elastic net regression (glmnet), with model training and evaluation performed using 10-fold cross-validation. Among these, random forest consistently outperformed the other models at all growth stages, showing promising results at the bulb development stage, with a training R 2 = 0.944, RMSE = 1.919 t ha -1 , MAE = 1.523 t ha -1 , and a validation R² = 0.755, RMSE = 3.824 t ha -1 , and MAE = 3.11 t ha -1 . The support vector machine also demonstrated strong generalization (training R² = 0.787; validation R 2 = 0.716), highlighting its predictive capability. Year-wise evaluation revealed notable interannual variability in model performance, with models trained on data from 2024 outperforming those from 2023. Overall, these results demonstrate the efficacy of UAV-derived multispectral sensing, combined with machine learning, as an effective, scalable, and timely approach for reliable onion yield prediction and decision support in rainy-season onion crops under varying agronomic conditions.

Plant phenotyping relevance

UAVマルチスペクトル画像からタマネギの収量を推定する取得・解析ワークフローと機械学習モデルを開発・評価しており、植物表現型の測定が中心である。

Code and data availability

The supplied blocks describe UAV multispectral imagery, vegetation indices, and ML yield models, but contain no public phenotype dataset, imagery deposit, or author analysis code with an explicit availability URL. The Data availability statement section is listed but its text is not supplied, and the supplementary link

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