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Improving the Performance of Vegetable Leaf Wetness Duration Models in Greenhouses Using Decision Tree Learning

1
Department of Informatics, University of Almería, ceiA3, CIESOL, 04120 Almería, Spain
2
Beijing Research Center for Information Technology in Agriculture, National Engineering Research Centre for Information Technology in Agriculture/National Engineering Laboratory for Agri-product Quality Traceability, Key Laboratory of Agri-informatics, Ministry of Agriculture, Beijing 100097, China
*
Authors to whom correspondence should be addressed.
Water 2019, 11(1), 158; https://doi.org/10.3390/w11010158
Received: 6 November 2018 / Revised: 7 January 2019 / Accepted: 15 January 2019 / Published: 17 January 2019
(This article belongs to the Section Water Resources Management and Governance)
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PDF [9584 KB, uploaded 17 January 2019]
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Abstract

Leaf wetness duration (LWD) is a key driving variable for peat and disease control in greenhouse management, and depends upon irrigation, rainfall, and dewfall. However, LWD measurement is often replaced by its estimation from other meteorological variables, with associated uncertainty due to the modelling approach used and its calibration. This study uses the decision learning tree method (DLT) for calibrating four LWD models—RH threshold model (RHM), the dew parameterization model (DPM), the classification and regression tree model (CART) and the neural network model (NNM)—whose performances in reproducing measured data are assessed using a large dataset. The relative importance of input variables in contributing to LWD estimation is also computed for the models tested. The LWD models were evaluated at two different greenhouse locations: in a Chinese (CN) greenhouse over three planting seasons (April 2014–October 2015) and in a Spanish (ES) greenhouse over four planting seasons (April 2016–February 2018). Based on multi-evaluation indicators, the models were given a ranking for their assessment capabilities during calibration (in the Spanish greenhouse from April 2016 to December 2016 and in the Chinese greenhouse from April 2014 to November 2014). The models were then evaluated on an independent set of data, and the obtained areas under the receiver operating characteristic curve (AUC) of the LWD models were over 0.73. Therein, the best LWD model in this case was the NNM, with positive predict values (PPVs) of 0.82 (SP) and 0.90 (CN), and mean absolute errors (MAEs) of 1.85 h (SP) and 1.30 h (CN). Consequently, the DLT can decrease LWD estimation error by calibrating the model threshold and choosing black box model input variables. View Full-Text
Keywords: leaf wetness threshold; data classification; data mining technology; dew temperature leaf wetness threshold; data classification; data mining technology; dew temperature
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wang, H.; Sanchez-Molina, J.A.; Li, M.; Rodríguez Díaz, F. Improving the Performance of Vegetable Leaf Wetness Duration Models in Greenhouses Using Decision Tree Learning. Water 2019, 11, 158.

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