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Article

Estimation of Yield Response Factor for Each Growth Stage under Local Conditions Using AquaCrop-OS

1
Department of Water Resources, School of Agricultural Engineering, University of Concepción, 3812120 Chillán, Chile
2
Institute of Hydrology and Meteorology, Technische Universität Dresden, 01062 Dresden, Germany
3
Water Research Center for Agriculture and Mining (CRHIAM), 3812120 Chillán, Chile
4
Centro de Sustentabilidad y Gestión Estratégica de Recursos (CiSGER), Facultad de Ingeniería, Universidad del Desarrollo, 7610658 Las Condes, Chile
*
Author to whom correspondence should be addressed.
Water 2020, 12(4), 1080; https://doi.org/10.3390/w12041080
Received: 16 February 2020 / Revised: 22 March 2020 / Accepted: 4 April 2020 / Published: 10 April 2020
(This article belongs to the Special Issue Crop Water Stress and Deficit Irrigation)
We propose a methodology to estimate the yield response factor (i.e., the slope of the water-yield function) under local conditions for a given crop, weather, sowing date, and management at each growth stage using AquaCrop-OS. The methodology was applied to three crops (maize, sugar beet, and wheat) and four soil types (clay loam, loam, silty clay loam, and silty loam), considering three levels of bulk density: low, medium, and high. Yields are estimated for different weather and management scenarios using a problem-specific algorithm for optimal irrigation scheduling with limited water supply (GET-OPTIS). Our results show a good agreement between benchmarking (mathematical approach) and benchmark (estimated by AquaCrop-OS) using the Normalised Root Mean Square Error (NRMSE), allowing us to estimate reliable yield response factors ( K y ) under local conditions and to dispose of the typical simple mathematical approach, which estimates the yield reduction as a result of water scarcity at each growth stage. View Full-Text
Keywords: AquaCrop-OS; crop yield function; yield response factor; growth stages AquaCrop-OS; crop yield function; yield response factor; growth stages
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MDPI and ACS Style

Kuschel-Otárola, M.; Schütze, N.; Holzapfel, E.; Godoy-Faúndez, A.; Mialyk, O.; Rivera, D. Estimation of Yield Response Factor for Each Growth Stage under Local Conditions Using AquaCrop-OS. Water 2020, 12, 1080. https://doi.org/10.3390/w12041080

AMA Style

Kuschel-Otárola M, Schütze N, Holzapfel E, Godoy-Faúndez A, Mialyk O, Rivera D. Estimation of Yield Response Factor for Each Growth Stage under Local Conditions Using AquaCrop-OS. Water. 2020; 12(4):1080. https://doi.org/10.3390/w12041080

Chicago/Turabian Style

Kuschel-Otárola, Mathias, Niels Schütze, Eduardo Holzapfel, Alex Godoy-Faúndez, Oleksandr Mialyk, and Diego Rivera. 2020. "Estimation of Yield Response Factor for Each Growth Stage under Local Conditions Using AquaCrop-OS" Water 12, no. 4: 1080. https://doi.org/10.3390/w12041080

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