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The role of decoupling factor on sugarcane crop water use under tropical conditions

Published online by Cambridge University Press:  21 January 2019

Daniel Silveira Pinto Nassif Open the ORCID record for Daniel Silveira Pinto Nassif [Opens in a new window] ,
Leandro Garcia da Costa Open the ORCID record for Leandro Garcia da Costa [Opens in a new window] ,
Murilo dos Santos Vianna Open the ORCID record for Murilo dos Santos Vianna [Opens in a new window] ,
Kassio dos Santos Carvalho Open the ORCID record for Kassio dos Santos Carvalho [Opens in a new window]  and
Fabio Ricardo Marin Open the ORCID record for Fabio Ricardo Marin [Opens in a new window]
Daniel Silveira Pinto Nassif*
Affiliation:
Federal University of São Carlos, Center of Natural Sciences, Buri SP, Brazil
Leandro Garcia da Costa
Affiliation:
University of São Paulo, ‘Luiz de Queiroz’ College of Agriculture, Piracicaba SP, Brazil
Murilo dos Santos Vianna
Affiliation:
University of São Paulo, ‘Luiz de Queiroz’ College of Agriculture, Piracicaba SP, Brazil
Kassio dos Santos Carvalho
Affiliation:
University of São Paulo, ‘Luiz de Queiroz’ College of Agriculture, Piracicaba SP, Brazil
Fabio Ricardo Marin
Affiliation:
University of São Paulo, ‘Luiz de Queiroz’ College of Agriculture, Piracicaba SP, Brazil
*
*Emails: dspnassif@gmail.com, daniel.nassif@ufscar.br
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Abstract

The expansion of sugarcane crop to regions with lower water supply in Brazil has increased the importance of correct estimation of crop water requirements. Currently, the irrigation management is generally done using the crop coefficient (Kc) based on the FAO 56 bulletin. Kc is used to determine the potential water demand of the crop for a given period of time and is considered constant for each crop stage. However, some recent studies have shown that Kc can be significantly variable under different evapotranspiration (ETo) rates. This paper aimed to analyse sugarcane water consumption at different scales: plant (sap flow measurements by energy balance method); canopy (Bowen ratio energy balance method); and plant–atmosphere coupling (infrared gas analyser) to reduce the uncertainties on the irrigation practices. Measurements were taken at two experimental sites, where a modern Brazilian cultivar CTC 12 was grown under drip irrigation and an old main Brazilian cultivar (RB867515) was grown under sprinkler irrigation by a central pivot. The mean crop evapotranspiration (ETc) values by the Bowen ratio energy balance method were 2.92 and 3.68 mm d−1 for RB867515 and CTC 12, respectively, resulting in a mean Kc of 0.99 at the full vegetative growth stage. Kc values were dependent on ETo and varied between 0.2 and 1.7 for both cultivars. This occurred in a crop coupled to the atmosphere (Ω = 0.37) and was the same found in other coupled crops such as coffee and citrus. In conclusion, the sugarcane Kc for southeast Brazil presented temporal variability due to coupling conditions according to reference evapotranspiration, and this should be considered in irrigation management.

Keywords

IrrigationWater use efficiencyVariable crop coefficient
Type
Research Article
Information
Experimental Agriculture , Volume 55 , Issue 6 , December 2019 , pp. 913 - 923
Copyright
© Cambridge University Press 2019 

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