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Estimation of Maize Water Requirements Based on the Low-Cost Image Acquisition Methods and the Meteorological Parameters

文献类型： 外文期刊

作者： Zhao, Jiuxiao 1 ; Tao, Jianping 1 ; Zhang, Shirui 2 ; Li, Jingjing 2 ; Li, Teng 2 ; Shan, Feifei 2 ; Zheng, Wengang 2 ;

作者机构： 1.Minist Agr & Rural Affairs, Key Lab Smart Agr Technol Yangtze River Delta, Nanjing 210044, Peoples R China

2.Beijing Acad Agr & Forestry Sci, Intelligent Equipment Res Ctr, Beijing 100097, Peoples R China

3.Jiangsu Acad Agr Sci, Nanjing 210014, Peoples R China

4.Minist Agr & Rural Affairs, Key Lab Qual Testing Software & Hardware Prod Agr, Beijing 100097, Peoples R China

关键词： crop coefficient; irrigation efficiency; segment network; classification network; machine learning

期刊名称：AGRONOMY-BASEL （ 影响因子：3.4； 五年影响因子：3.8 ）

ISSN：

年卷期： 2024 年 14 卷 10 期

页码：

收录情况： SCI

摘要： This study aims to enhance maize water demand calculation. We calculate crop evapotranspiration (ETc) through mobile phone photography and meteorological parameters. In terms of crop coefficient (Kc) calculation, we utilize the mobile phone camera image driver to establish a real-time monitoring model of Kc based on plant canopy coverage (PGC) changes. The calculation of PGC is achieved by constructing a PGC classification network and a Convolutional Block Attention Module (CBAM)-U2Net is implemented by the segment network. For the reference crop evapotranspiration (ETo) calculation, we constructed a simplified ETo estimation model based on SVR, LSTM, Optuna LSTM, and GWO-SVM using a public meteorological data-driven program, and evaluated its performance. The results demonstrate that our method achieves high classification accuracy for the PGC 98.9% and segmentation accuracy for the CBAM-U2net-based segmentation network 95.68%. The Kc calculation model exhibits a root mean square error (RMSE) of 0.053. In terms of ETo estimation, the Optuna-LSTM model with four variables demonstrates the best estimation effect, with a correlation coefficient (R2) of 0.953. The final R2 between the estimated ETc value and the true value is 0.918, with an RMSE of 0.014. This method can effectively estimate the water demand of maize.

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