Assessing the Performance of the WOFOST Model in Simulating Jujube Fruit Tree Growth under Different Irrigation Regimes

Tiecheng Bai, Nannan Zhang, Youqi Chen and Benoit Mercatoris
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Tiecheng Bai: College of Information Engineering, Tarim University, Akaer 843300, China
Nannan Zhang: College of Information Engineering, Tarim University, Akaer 843300, China
Youqi Chen: Institute of Agricultural Resources and Regional Planning of CAAS, No. 12 Zhongguancun South St., Haidian District, Beijing 100081, China
Benoit Mercatoris: TERRA Teaching and Research Centre, Gembloux Agro-Bio Tech, Liège University, Passage des Déportés, 2, 5030 Gembloux, Belgium

Sustainability, 2019, vol. 11, issue 5, 1-16

Abstract: Cropping system models are widely employed to evaluate plant water requirements and growth situations. However, these models rarely focus on growth studies of perennial fruit trees. The aim of this study was to evaluate the performance of the WOFOST (WOrld FOod STudies) model in simulating jujube fruit tree growth under different irrigation treatments. The model was calibrated on data obtained from full irrigation treatments in 2016 and 2017. The model was validated on four deficit percentages (60%, 70%, 80%, and 90%) and one full irrigation treatment from 2016 to 2018. Calibrated R 2 and RMSE values of simulated versus measured soil moisture content, excluding samples on the day of irrigation and first day after irrigation, reached 0.94 and 0.005 cm 3 cm −3 . The model reproduced growth dynamics of the total biomass and leaf area index, with a validated R 2 = 0.967 and RMSE = 0.915 t ha −1 , and R 2 = 0.962 and RMSE = 0.160 m 2 m −2 , respectively. The model also showed good global performance, with R 2 = 0.86 and RMSE = 0.51 t ha −1 , as well as good local agreement (R 2 ≥ 0.8 ) and prediction accuracy (RMSE ≤ 0.62 t ha −1 ) for each growth season. Furthermore, 90% of full irrigation can be recommended to achieve a balance between jujube yields and water savings (average decline ratio of yield ≤ 3.8%).

Keywords: jujube fruit; crop growth model; soil water balance; irrigation degree; growth simulation (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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