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Water use and crop coefficients of soybean cultivars of diverse maturity groups and assessment of related water management strategies

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Abstract

The FAO-56 two-step approach (Kc-ETo) is commonly used to estimate crop evapotranspiration (ETc) for various crops and climate conditions. This approach consists of the product of a specific crop coefficient (Kc) and the grass-reference evapotranspiration (ETo). Crop coefficients were adjusted to regional climate conditions aiming at incorporating crop-specific impacts of relative humidity and wind speed on Kc in addition to climate impacts already represented in ETo. In the current study, crop water use and actual crop evapotranspiration and transpiration (ETc act and Tc act) were studied for four soybean maturity groups under irrigated and rainfed conditions. Field experiments were conducted in Southern Brazil along two seasons (2018/19 and 2019/20). Observations included measurements of the fraction of ground cover (fc), plant height (h), and soil water content (SWC) to calculate the soil water balance and estimate the soybean yields. Using the soil water balance model SIMDualKc with field collected data allowed estimating the actual and standard Kcb. The model adopts the dual Kc approach and was calibrated and validated using the field observations from, respectively, 2018/19 and 2019/20. Thus, the study provided for accurately estimating and partitioning soybean ETc act into soil evaporation and crop transpiration. Results of fitting observed SWC by model simulated data provided for a set of excellent goodness-of-fit indicators. Therefore, the actual Kcb estimated with SIMDualKc are assumed to have excellent accuracy for computing actual transpiration to be used for supporting soybean irrigation scheduling. This study allowed to evaluate the main water use and yield responses to water stress of diverse soybean maturity groups and to assess the impacts of related water management strategies.

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Acknowledgements

This research was supported by the Department of Rural Engineering, Center of Rural Sciences, Federal University of Santa Maria, and the FATEC—Fundação para o Apoio à Tecnologia e Ciência, maintainer of the research and extension projects coordinated by the first author. The support of FCT—Fundação para a Ciência e a Tecnologia, I.P., under the project LEAF—Linking Landscape, Environment, Agriculture and Food, Research (UIDB/04129/2020) and through the grant attributed to P. Paredes (DL57/2016/CP1382/CT0022) is acknowledged.

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MTP, and JDM: conceptualization and methodology; TFM, CMF and GAH: field work and data collection; MTP and TFM: data analysis, modeling, calibration, and validation, MTP, PP; and LSP: formal analysis, writing, review and editing, project administration, and funding acquisition. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Mirta T. Petry.

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The authors declare no conflicts of interest relevant to this study.

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Petry, M.T., Magalhães, T.F., Paredes, P. et al. Water use and crop coefficients of soybean cultivars of diverse maturity groups and assessment of related water management strategies. Irrig Sci (2023). https://doi.org/10.1007/s00271-023-00871-w

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  • DOI: https://doi.org/10.1007/s00271-023-00871-w

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