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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Crop coefficient changes with reference evapotranspiration for highly canopy-atmosphere coupled crops

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Marin, Fabio R. [1] ; Angelocci, Luiz R. [1] ; Nassif, Daniel S. P. [1] ; Costa, Leandro G. [1] ; Vianna, Murilo S. [1] ; Carvalho, Kassio S. [1]
Total Authors: 6
[1] Univ Sao Paulo, Coll Agr Luiz de Queiroz ESALQ, Biosyst Engn Dept, BR-13418900 Piracicaba, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Agricultural Water Management; v. 163, p. 139-145, JAN 1 2016.
Web of Science Citations: 7

Despite of the great advancement of technologies for water supply, irrigation management remains inadequate in most areas. The lack of basic information on crop water needs is one of the causes for inadequate water use and irrigation management. The approach normally used to quantify the consumptive use of water by irrigated crops is the crop coefficient-reference evapotranspiration (Kc ETo) procedure. In this procedure, reference evapotranspiration (ETo) is computed for a grass or alfalfa reference crop and is then multiplied by an empirical crop coefficient (Kc) to produce an estimate of crop evapotranspiration (ETc). The ETo represents the non-stressed ET based on weather data. We selected three experiments with different crops in terms of physiology and planting arrangements to discuss the crop coefficient paradigm and its relation with reference evapotranspiration for highly canopy-atmosphere coupled crops. We found the Kc decreasing as ETo increased as a consequence of high plant atmosphere coupling and high crop inner resistance, which limits the amount of water the plant could supply to the atmosphere. Even for sugarcane plantation (after it completely covered the ground) Kc decreased with ETo, highlighting that trend might not be exclusive of tall sparse crops and for well coupled to the atmosphere. For these reasons, we suggested the definition of Kcb (for sparse crops) and Kc should take into account ETo ranges besides the components currently considered. (C) 2015 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 11/18072-2 - Evapotranspiration, transpiration and gas exchange in irrigated sugarcane field
Grantee:Daniel Silveira Pinto Nassif
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 14/50023-0 - Hydro-social and environmental impacts of sugarcane production on land use and food security – an international programme to foster trans-disciplinary science, networking and community building - THESIS
Grantee:Fabio Ricardo Marin
Support type: Program for Research on Bioenergy (BIOEN) - Regular Program Grants
FAPESP's process: 13/16511-4 - Influence of crop residues on water consumption, growth and yield of irrigated sugarcane
Grantee:Leandro Garcia da Costa
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 14/05887-6 - Development, enhancement, calibration and evaluation of a process-based model for Brazilian sugarcane
Grantee:Murilo dos Santos Vianna
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 14/12406-4 - Brazilian sugarcane yield-gap: current status and future projection based on climate, soil and water management changes
Grantee:Fabio Ricardo Marin
Support type: Research Program on Global Climate Change - Regular Grants