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Evaluation of hydroclimatic variables for maize yield estimation using crop model and remotely sensed data assimilation

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Abstract

We used the Decision Support System for Agro-technology Transfer-Cropping System Model (DSSAT) and data assimilation scheme (DSSAT-DA) to estimate maize (i.e., corn) yield and to evaluate the sensitivity of maize yield to hydroclimatic variables (i.e., precipitation, air temperatures, solar radiation, soil water). The remotely sensed soil moisture products, which includes Advanced Microwave Scanning Radiometer and the Soil Moisture and Ocean Salinity, were assimilated to DSSAT model by using the Ensemble Kalman Filtering approach. It was observed that both DSSAT and DSSAT-DA models can able to capture the annual trend of maize yield, although they overestimate the observed maize yield. The DSSAT-DA scheme assimilated with remotely sensed products slightly improves the model performance. The antecedent hydroclimatic information can influence the subsequent maize yield. The maize yield is sensitive to the soil water availability and precipitation amount, especially at the antecedent 1 month time to sowing and the subsequent second and third month’s growing period.

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Acknowledgements

This study was supported by the United States Department of Agriculture (USDA) award 2015-68007-23210, the National Natural Science Foundation of China (Grant No. 51709074), the Fundamental Research Funds for the Central Universities of China (Grant No. 2018B10414), the National Key Research and Development Program of China (Grant No. 2016YFC0402706), and the Special Fund of the State Key Laboratory of Hydrology-Water Resources (Grant No. 20145027312).

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Correspondence to Ashok K. Mishra.

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Liu, D., Mishra, A.K. & Yu, Z. Evaluation of hydroclimatic variables for maize yield estimation using crop model and remotely sensed data assimilation. Stoch Environ Res Risk Assess 33, 1283–1295 (2019). https://doi.org/10.1007/s00477-019-01700-3

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  • DOI: https://doi.org/10.1007/s00477-019-01700-3

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