Standard single and basal crop coefficients for field crops. Updates and advances to the FAO56 crop water requirements method

Detalhes bibliográficos
Autor(a) principal: Pereira, L.S.
Data de Publicação: 2021
Outros Autores: Paredes, Paula, Hunsaker, D.J., López-Urrea, R., Shad, Z. Mohammad
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.5/21813
Resumo: Review
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spelling Standard single and basal crop coefficients for field crops. Updates and advances to the FAO56 crop water requirements methodtransferability of standard Kcupper limits to Kcresearch accuracy requirementsgrain legumesfiber and oil cropssugar cropscerealsriceReviewThis study reviews the abundant research on FAO56 crop coefficients, published following introduction of the FAO56 paper in 1998. The primary goal was to evaluate, update, and consolidate the mid-season and end-season single (Kc) and basal (Kcb) crop coefficients, tabulated for many field crops in FAO56. The review found that the prevalent approach for estimating crop evapotranspiration (ETc) is the FAO56 Kc-ETo approach, i.e., the product of the Kc and reference evapotranspiration (ETo). The FAO56 Kc-ETo approach requires use of the FAO56 PM-ETo grass reference equation with appropriate crop-specific Kc and/or Kcb. Reviewed research provided various approaches to determine Kc and Kcb and used a variety of actual crop ET (ETc act) measurements. Significant attention was placed on accessing the accuracy of the field measurements and models used in these studies. Accuracy requirements, upper limits for Kc values, and related causal errors are discussed. Conceptual approaches relative to Kc transferability requirements are provided with focus on standard crop conditions and use of the FAO56 segmented Kc curve. Papers selected to update Kc∕Kcb used the FAO56 PM-ETo, provided accurate measurements to determine and partition ETc act, and satisfied transferability requirements. Selected observed Kc and Kcb values were converted to standard, sub-humid climate as adopted in FAO56. Observed values, with respect to tabulated FAO56 Kc and Kcb, were used in consolidating updated values for crops within general categories of grain legumes, fiber crops, oil crops, sugar crops, small grain cereals, maize and sorghum, and rice. Ancillary data, e.g., maximum root depth and crop height, were also collected from selected literature and tabulated. Results showed good agreement between updated and original tabulated FAO56 Kc and Kcb, confirming the reliability of the FAO56 values. This indicates change in the Kc (ETc/ETo ratio) of crops has not occurred due to climate change during the past ≈sixty years. New Kc∕Kcb data for crops, not included in FAO56, are also now presented for several oil crops and pseudocereals. The approach adopted for rice differs from FAO56 because consideration was given to the numerous rice water management practices currently used and, thus, Kc∕Kcb values for the initial season of rice were also presented. The review also observed that many research papers did not satisfy the adopted requirements in terms of ETo method and/or the accuracy of ETc act determinations and, therefore, could not be used. Thus, emphasis is placed on adopting improved accuracy and quality control in future research aimed at determining Kc data comparable to presented values. The transferability of standard Kc and Kcb has been assured for the values tabulated herein. Improved future applications of the FAO56 Kc-ETo method should consider remote sensing observations when available, particularly in defining crop growth stages at given locationsElsevierRepositório da Universidade de LisboaPereira, L.S.Paredes, PaulaHunsaker, D.J.López-Urrea, R.Shad, Z. Mohammad2021-09-14T12:02:56Z20212021-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.5/21813engAgricultural Water Management 243 (2021) 106466https://doi.org/10.1016/j.agwat.2020.106466info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-03-06T14:51:21Zoai:www.repository.utl.pt:10400.5/21813Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T17:06:19.915426Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Standard single and basal crop coefficients for field crops. Updates and advances to the FAO56 crop water requirements method
title Standard single and basal crop coefficients for field crops. Updates and advances to the FAO56 crop water requirements method
spellingShingle Standard single and basal crop coefficients for field crops. Updates and advances to the FAO56 crop water requirements method
Pereira, L.S.
transferability of standard Kc
upper limits to Kc
research accuracy requirements
grain legumes
fiber and oil crops
sugar crops
cereals
rice
title_short Standard single and basal crop coefficients for field crops. Updates and advances to the FAO56 crop water requirements method
title_full Standard single and basal crop coefficients for field crops. Updates and advances to the FAO56 crop water requirements method
title_fullStr Standard single and basal crop coefficients for field crops. Updates and advances to the FAO56 crop water requirements method
title_full_unstemmed Standard single and basal crop coefficients for field crops. Updates and advances to the FAO56 crop water requirements method
title_sort Standard single and basal crop coefficients for field crops. Updates and advances to the FAO56 crop water requirements method
author Pereira, L.S.
author_facet Pereira, L.S.
Paredes, Paula
Hunsaker, D.J.
López-Urrea, R.
Shad, Z. Mohammad
author_role author
author2 Paredes, Paula
Hunsaker, D.J.
López-Urrea, R.
Shad, Z. Mohammad
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Pereira, L.S.
Paredes, Paula
Hunsaker, D.J.
López-Urrea, R.
Shad, Z. Mohammad
dc.subject.por.fl_str_mv transferability of standard Kc
upper limits to Kc
research accuracy requirements
grain legumes
fiber and oil crops
sugar crops
cereals
rice
topic transferability of standard Kc
upper limits to Kc
research accuracy requirements
grain legumes
fiber and oil crops
sugar crops
cereals
rice
description Review
publishDate 2021
dc.date.none.fl_str_mv 2021-09-14T12:02:56Z
2021
2021-01-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.5/21813
url http://hdl.handle.net/10400.5/21813
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Agricultural Water Management 243 (2021) 106466
https://doi.org/10.1016/j.agwat.2020.106466
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
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