Estimating Maize Leaf Water Content Using Machine Learning with Diverse Multispectral Image Features.

Abstract

Leaf water content (LWC) is a key physiological parameter for assessing maize moisture status, with direct implications for crop growth and yield. Accurate LWC estimation is essential for water resource management and precision agriculture. This study introduces a high-precision method for estimating maize LWC utilizing UAV-based multispectral imagery combined with a Random Forest Regression (RFR) model. By extracting vegetation indices, image coverage, and texture features and integrating them with ground-truth data, the study examines the variation in LWC estimation accuracy across different growth stages. The results indicate that the RFR model performs optimally during the seedling stage, with a root relative mean square error (RRMSE) of 2.99%, whereas estimation errors are larger during the tasseling stage, with an RRMSE of 4.13%. Moreover, the RFR model consistently outperforms multiple linear regression (MLR) and ridge regression (RR) models throughout the growing season, demonstrating lower errors on both training and testing datasets. Notably, the RFR model exhibits significantly reduced errors in the training dataset compared to both MLR and RR models. Following particle swarm optimization (PSO), the prediction accuracy of the RFR model is notably enhanced, with the RRMSE on the training dataset decreasing from 1.46% to 1.19%. This study provides an effective approach for estimating maize LWC across different growth stages, supporting crop water management and precision agriculture, and offering valuable insights for the estimation of water content in other crops.

Plant phenotyping relevance

UAVマルチスペクトル画像と機械学習により、トウモロコシ葉の水分含量という生理形質を推定する手法が研究の中心であり、モデル比較・精度評価も実施している。

Code and data availability

The supplied blocks describe UAV multispectral imagery, field LWC measurements, and Python/Scikit-learn modeling, but contain no data availability statement, public dataset deposit, or author code repository. The only URLs present are author ORCID profiles and the CC BY license notice, none of which are paper-specific,

No evidence-backed public reproduction asset is currently recorded.