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Soybean irrigation requirements and canopy-atmosphere coupling in Southern Brazil

Author

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  • da Silva, Evandro H.F.M.
  • Gonçalves, Alexandre O.
  • Pereira, Rodolfo A.
  • Fattori Júnior, Izael M.
  • Sobenko, Luiz R.
  • Marin, Fábio R.

Abstract

The lack of base information on crop water requirements under tropical conditions is one of the causes for inefficient water use and inadequate irrigation management. The crop coefficient (Kc) approach is universally adopted for scheduling and quantifying the water management and, recently, its relation with the evaporative atmosphere demand has been included in this approach to improve the decision-making on irrigation management. In this paper, we measured crop evapotranspiration (ETc) in two experiments as evaporative heat flux from a centre pivot-irrigated soybean plantations in tropical Brazil to quantify the crop water needs. Irrigation requirements were determined by comparing ETc with reference evapotranspiration (ETo), derived from FAO-56 (Allen et al., 1998). In this study, the average Kc value obtained was 0.92, which is nearly 20% lower than those recommended by the FAO-56 (Allen et al., 1998) and varied inversely as a function of ETo. Based on aerodynamic and leaf diffusive resistance (rs) data, Ω was computed and presented values relatively high compared to other crops, which means a relatively poor coupling of soybean canopies to the atmosphere. Throughout both experiments, the Kc value decreased by up to 44.8% when the ETo increased from 2 to 4 mm d−1, depending on the phenological phase, indicating the need for taking into account the ETo values when selection the Kc values for improving the irrigation management in tropical soybean.

Suggested Citation

  • da Silva, Evandro H.F.M. & Gonçalves, Alexandre O. & Pereira, Rodolfo A. & Fattori Júnior, Izael M. & Sobenko, Luiz R. & Marin, Fábio R., 2019. "Soybean irrigation requirements and canopy-atmosphere coupling in Southern Brazil," Agricultural Water Management, Elsevier, vol. 218(C), pages 1-7.
    • Handle: RePEc:eee:agiwat:v:218:y:2019:i:c:p:1-7
    DOI: 10.1016/j.agwat.2019.03.003
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    References listed on IDEAS

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    1. Zhang, Bangbang & Feng, Gary & Kong, Xiangbin & Lal, Rattan & Ouyang, Ying & Adeli, Ardeshir & Jenkins, Johnie N., 2016. "Simulating yield potential by irrigation and yield gap of rainfed soybean using APEX model in a humid region," Agricultural Water Management, Elsevier, vol. 177(C), pages 440-453.
    2. Payero, José O. & Irmak, Suat, 2013. "Daily energy fluxes, evapotranspiration and crop coefficient of soybean," Agricultural Water Management, Elsevier, vol. 129(C), pages 31-43.
    3. Garcia y Garcia, A. & Persson, T. & Guerra, L.C. & Hoogenboom, G., 2010. "Response of soybean genotypes to different irrigation regimes in a humid region of the southeastern USA," Agricultural Water Management, Elsevier, vol. 97(7), pages 981-987, July.
    4. Marin, Fábio R. & Angelocci, Luiz R. & Nassif, Daniel S.P. & Costa, Leandro G. & Vianna, Murilo S. & Carvalho, Kassio S., 2016. "Crop coefficient changes with reference evapotranspiration for highly canopy-atmosphere coupled crops," Agricultural Water Management, Elsevier, vol. 163(C), pages 139-145.
    5. Marin, Fabio R. & Angelocci, Luiz Roberto, 2011. "Irrigation requirements and transpiration coupling to the atmosphere of a citrus orchard in Southern Brazil," Agricultural Water Management, Elsevier, vol. 98(6), pages 1091-1096, April.
    6. Karam, Fadi & Masaad, Randa & Sfeir, Therese & Mounzer, Oussama & Rouphael, Youssef, 2005. "Evapotranspiration and seed yield of field grown soybean under deficit irrigation conditions," Agricultural Water Management, Elsevier, vol. 75(3), pages 226-244, July.
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    Cited by:

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