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http://dx.doi.org/10.5532/KJAFM.2018.20.3.262

Evaluating the prediction models of leaf wetness duration for citrus orchards in Jeju, South Korea  

Park, Jun Sang (Applied Meteorology Research Division, National Institute of Meteorological Sciences)
Seo, Yun Am (Applied Meteorology Research Division, National Institute of Meteorological Sciences)
Kim, Kyu Rang (Applied Meteorology Research Division, National Institute of Meteorological Sciences)
Ha, Jong-Chul (Applied Meteorology Research Division, National Institute of Meteorological Sciences)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.20, no.3, 2018 , pp. 262-276 More about this Journal
Abstract
Models to predict Leaf Wetness Duration (LWD) were evaluated using the observed meteorological and dew data at the 11 citrus orchards in Jeju, South Korea from 2016 to 2017. The sensitivity and the prediction accuracy were evaluated with four models (i.e., Number of Hours of Relative Humidity (NHRH), Classification And Regression Tree/Stepwise Linear Discriminant (CART/SLD), Penman-Monteith (PM), Deep-learning Neural Network (DNN)). The sensitivity of models was evaluated with rainfall and seasonal changes. When the data in rainy days were excluded from the whole data set, the LWD models had smaller average error (Root Mean Square Error (RMSE) about 1.5hours). The seasonal error of the DNN model had the similar magnitude (RMSE about 3 hours) among all seasons excluding winter. The other models had the greatest error in summer (RMSE about 9.6 hours) and the lowest error in winter (RMSE about 3.3 hours). These models were also evaluated by the statistical error analysis method and the regression analysis method of mean squared deviation. The DNN model had the best performance by statistical error whereas the CART/SLD model had the worst prediction accuracy. The Mean Square Deviation (MSD) is a method of analyzing the linearity of a model with three components: squared bias (SB), nonunity slope (NU), and lack of correlation (LC). Better model performance was determined by lower SB and LC and higher NU. The results of MSD analysis indicated that the DNN model would provide the best performance and followed by the PM, the NHRH and the CART/SLD in order. This result suggested that the machine learning model would be useful to improve the accuracy of agricultural information using meteorological data.
Keywords
Leaf Wetness Duration; Mean Square Deviation; Number of Hours of Relative Humidity; Classification And Regression Tree; Penman-Monteith; Deep-learning Neural Network;
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Times Cited By KSCI : 4  (Citation Analysis)
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