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Revised VegSyst model to calculate dry matter production, critical N uptake and ETc of several vegetable species grown in Mediterranean greenhouses

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  • Gallardo, M.
  • Fernández, M.D.
  • Giménez, C.
  • Padilla, F.M.
  • Thompson, R.B.

Abstract

The VegSyst simulation model simulates daily crop N uptake and crop evapotranspiration (ETc) and is a basic component of the VegSyst-DSS decision support system that calculates daily crop N and irrigation requirements of vegetable crops grown in Mediterranean greenhouses. In this work, the VegSyst model was revised to produce version 2 which is simpler and has fewer inputs. VegSyst V2 was calibrated and validated for various species, and species-management combinations. The following changes were made to VegSyst V2. The Almeria Radiation method was included as an alternative to the Penman–Monteith equation to calculate reference evapotranspiration (ETo) because it requires less climate inputs. The growth model was reduced from two phases to one phase, and the maximum fraction of intercepted PAR radiation is now maintained to the end of crop. In autumn–winter grown crops, two values of radiation use efficiency (RUE) are now used with a reduced RUE value for the winter period; a single RUE value is used for spring grown crops. A critical N dilution curve is now used rather than that of a well-fertilized crop. The model was: (a) calibrated for cucumber, zucchini, non-supported melon, watermelon and eggplant, and (b) re-calibrated for pepper and supported melon. Calibration parameters for determining daily crop coefficient (kc) values and for the critical N curves were obtained from previous local studies and published work. Model performance was evaluated for the simulation of daily dry matter production (DMP), critical N uptake (the minimum N uptake to achieve maximum DMP) and crop evapotranspiration (ETc) of several vegetable species. In all species and species-management combinations evaluated, model performance was good for simulation of DMP and was generally acceptable for simulation of ETc, although there were some discrepancies. Where crop N uptake data were available, simulated critical N uptake was consistently lower than the measured N uptake suggesting that the validation crops were not N limited. Differences were observed between the two equations to calculate reference evapotranspiration (ETo), with the Penman–Monteith equation calculating higher values in winter and lower values in summer. In seven of twelve cases, simulation of ETo was more accurate with Penman–Monteith; in five cases, mostly with winter crops, it was more accurate with the Almeria Radiation method. With the modifications, VegSyst V2 is simpler, requires fewer inputs and provides simulation of DMP, ETc and critical N uptake for the most important vegetable species grown in Mediterranean greenhouses.

Suggested Citation

  • Gallardo, M. & Fernández, M.D. & Giménez, C. & Padilla, F.M. & Thompson, R.B., 2016. "Revised VegSyst model to calculate dry matter production, critical N uptake and ETc of several vegetable species grown in Mediterranean greenhouses," Agricultural Systems, Elsevier, vol. 146(C), pages 30-43.
    • Handle: RePEc:eee:agisys:v:146:y:2016:i:c:p:30-43
    DOI: 10.1016/j.agsy.2016.03.014
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    References listed on IDEAS

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    1. Orgaz, F. & Fernandez, M.D. & Bonachela, S. & Gallardo, M. & Fereres, E., 2005. "Evapotranspiration of horticultural crops in an unheated plastic greenhouse," Agricultural Water Management, Elsevier, vol. 72(2), pages 81-96, March.
    2. Gallardo, M. & Giménez, C. & Martínez-Gaitán, C. & Stöckle, C.O. & Thompson, R.B. & Granados, M.R., 2011. "Evaluation of the VegSyst model with muskmelon to simulate crop growth, nitrogen uptake and evapotranspiration," Agricultural Water Management, Elsevier, vol. 101(1), pages 107-117.
    3. Thompson, R.B. & Martinez-Gaitan, C. & Gallardo, M. & Gimenez, C. & Fernandez, M.D., 2007. "Identification of irrigation and N management practices that contribute to nitrate leaching loss from an intensive vegetable production system by use of a comprehensive survey," Agricultural Water Management, Elsevier, vol. 89(3), pages 261-274, May.
    4. Yang, J.M. & Yang, J.Y. & Liu, S. & Hoogenboom, G., 2014. "An evaluation of the statistical methods for testing the performance of crop models with observed data," Agricultural Systems, Elsevier, vol. 127(C), pages 81-89.
    5. Soto, F. & Gallardo, M. & Giménez, C. & Peña-Fleitas, T. & Thompson, R.B., 2014. "Simulation of tomato growth, water and N dynamics using the EU-Rotate_N model in Mediterranean greenhouses with drip irrigation and fertigation," Agricultural Water Management, Elsevier, vol. 132(C), pages 46-59.
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    Cited by:

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    3. Puccinelli, Martina & Carmassi, Giulia & Pardossi, Alberto & Incrocci, Luca, 2023. "Wild edible plant species grown hydroponically with crop drainage water in a Mediterranean climate: Crop yield, leaf quality, and use of water and nutrients," Agricultural Water Management, Elsevier, vol. 282(C).
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    5. Savvas, Dimitrios & Giannothanasis, Evangelos & Ntanasi, Theodora & Karavidas, Ioannis & Drakatos, Stefanos & Panagiotakis, Ioannis & Neocleous, Damianos & Ntatsi, Georgia, 2023. "Improvement and validation of a decision support system to maintain optimal nutrient levels in crops grown in closed-loop soilless systems," Agricultural Water Management, Elsevier, vol. 285(C).
    6. Soto, F. & Thompson, R.B. & Granados, M.R. & Martínez-Gaitán, C. & Gallardo, M., 2018. "Simulation of agronomic and nitrate pollution related parameters in vegetable cropping sequences in Mediterranean greenhouses using the EU-Rotate_N model," Agricultural Water Management, Elsevier, vol. 199(C), pages 175-189.
    7. Giménez, C. & Thompson, R.B. & Prieto, M.H. & Suárez-Rey, E. & Padilla, F.M. & Gallardo, M., 2019. "Adaptation of the VegSyst model to outdoor conditions for leafy vegetables and processing tomato," Agricultural Systems, Elsevier, vol. 171(C), pages 51-64.
    8. Gallardo, Marisa & Peña-Fleitas, María Teresa & Giménez, Carmen & Padilla, Francisco M. & Thompson, Rodney B., 2023. "Adaptation of VegSyst-DSS for macronutrient recommendations of fertigated, soil-grown, greenhouse vegetable crops," Agricultural Water Management, Elsevier, vol. 278(C).
    9. Xu, Xiangying & Wang, Chao & Wang, Hongjiang & Zhang, Yonglong & Cao, Zhuangzhuang & Zhang, Zhiping & Dai, Haibo & Miao, Minmin, 2023. "Development and performance evaluation of an APP for vegetable fertilization and irrigation management originated from EU-Rotate_N," Agricultural Water Management, Elsevier, vol. 289(C).
    10. Phogat, V. & Mallants, Dirk & Cox, J.W. & Šimůnek, J. & Oliver, D.P. & Awad, J., 2020. "Management of soil salinity associated with irrigation of protected crops," Agricultural Water Management, Elsevier, vol. 227(C).
    11. Berrueta, Cecilia & Grasso, Rafael & García, Claudio & Thompson, Rodney B. & Gallardo, Marisa, 2023. "Use of the VegSyst model to simulate seasonal dry matter production, N and K uptake and evapotranspiration in greenhouse soil-grown tomato in Uruguay," Agricultural Water Management, Elsevier, vol. 286(C).
    12. Tang, Ruoling & Supit, Iwan & Hutjes, Ronald & Zhang, Fen & Wang, Xiaozhong & Chen, Xuanjing & Zhang, Fusuo & Chen, Xinping, 2023. "Modelling growth of chili pepper (Capsicum annuum L.) with the WOFOST model," Agricultural Systems, Elsevier, vol. 209(C).

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