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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.)

Revisiting the crop coefficient-reference evapotranspiration procedure for improving irrigation management

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Author(s):
Marin, Fabio R. [1] ; Angelocci, Luiz R. [1] ; Nassif, Daniel S. P. [2] ; Vianna, Murilo S. [1] ; Pilau, Felipe G. [1] ; da Silva, Evandro H. F. M. [1] ; Sobenko, Luiz R. [1] ; Goncalves, Alexandre O. [1, 3] ; Pereira, Rodolfo A. A. [1] ; Carvalho, Kassio S. [4]
Total Authors: 10
Affiliation:
[1] Univ Sao Paulo, Coll Agr Luiz de Queiroz ESALQ, Piracicaba, SP - Brazil
[2] Fed Univ Sao Carlos UFSCAR, Buri, SP - Brazil
[3] Embrapa Soils, Rio De Janeiro, RJ - Brazil
[4] Fed Inst Mato Grosso, Sorriso, MT - Brazil
Total Affiliations: 4
Document type: Journal article
Source: THEORETICAL AND APPLIED CLIMATOLOGY; v. 138, n. 3-4, p. 1785-1793, NOV 2019.
Web of Science Citations: 1
Abstract

The consumptive use of water by irrigated crops is typically quantified using the crop coefficient-reference evapotranspiration (K-c-ETo) procedure; yet, recent results showed that K-c might change with ETo, in response to high atmospheric demand. It is not known if the reduced K-c at high ETo applies to other crops with different aerodynamic features of the canopies. This paper seeks to provide the K-c values for soybean, wheat and potato, and propose an adaptation to the K-c-ETo procedure, hypothesising that the inverse relation between K-c and ETo would be general for all types of crops. Our results showed average K-c values of 0.90, 1.18 and 1.28, respectively, for soybean, wheat and potato cropping systems in the Brazilian cropping systems. However, K-c decreased as ETo increased, for all crops considered in this study, because of the increase of internal plant resistances to vapour diffusion from the leaves to the atmosphere. When ETo was above >4 mm d(-1), the water use by such crops was lower than that prescribed by Allen et al. (JAMA, 1998). The time-based K-c curves in Allen et al. (JAMA, 1998) are inappropriate for the studied crops under high demanding conditions and, besides the considerations suggested by Allen et al. (JAMA, 1998) (i.e., crop development stage, presence or absence of weeds), K-c recommendations for practical irrigation management should be based on the average ETo values of the previous days of the irrigation procedure. (AU)

FAPESP's process: 17/20925-0 - Brazilian yield-gap atlas: assessing the potential for sustainable intensification of Brazilian agriculture
Grantee:Fabio Ricardo Marin
Support Opportunities: Regular Research Grants
FAPESP's process: 17/50445-0 - Brazilian yield-gap atlas: assessing the potential for sustainable intensification of Brazilian agriculture
Grantee:Fabio Ricardo Marin
Support Opportunities: Regular Research Grants
FAPESP's process: 11/18072-2 - Evapotranspiration, transpiration and gas exchange in irrigated sugarcane field
Grantee:Daniel Silveira Pinto Nassif
Support Opportunities: 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 Opportunities: 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 Opportunities: Research Program on Global Climate Change - Regular Grants