Sugarcane evapotranspiration and irrigation requirements in tropical climates

Marin, Fabio R., Inman-Bamber, Geoff, Silva, Thieres, Vianna, Murilo S., Nassif, Daniel S.P., and Carvalho, Kassio S. (2020) Sugarcane evapotranspiration and irrigation requirements in tropical climates. Theoretical and Applied Climatology, 140. pp. 1349-1357.

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Irrigation is necessary to help meet the high demand for water by sugarcane in several countries including Brazil and Australia. The crop irrigation requirements are typically estimated using the crop coefficient-reference evapotranspiration (Kc-ETo) procedure. Sugarcane evapotranspiration rates were measured in three different sugarcane-producing regions of the world, and crop coefficients (Kc) were derived for those diverse environments, irrigation methods, and farming systems, therefore representing a robust basis for irrigation management. We also verified the occurrence of the inverse relation between Kc and ETo found in previous studies. Two experiments in Brazil and one in Australia were used for the analysis. Our data showed that Kc for a full canopy cover was lower than 1.0 in the three experimental sites and that sugarcane evapotranspiration (ETc) seems to be limited and exceeds ETo only when this is below 4 mm day(-1). In one of the Brazilian experiments, Kc declined at higher rates than in the other two experiments, and for the three sites, average Kc was 0.77 and 0.87, respectively, for initial and full cover phase when ETo > 6 mm day(-1). The increase of aerodynamic and other upstream resistances to water transport of plants appears to be one of the reasons for Kc to decrease at high levels of ETo. Based on our data and the literature, the Kc values provided by Allen et al. (1998) could overestimate the irrigation needs of sugarcane under high evaporative demand conditions. Irrigation management based on Kc should use the average ETo from the preceding 3 days before irrigating to save water and energy while maintaining high yield levels.

Item ID: 63198
Item Type: Article (Research - C1)
ISSN: 1434-4483
Keywords: canopy architecture, crop yield, evapotranspiration, irrigation, sugar cane, tropical region, water demand, water management, water uptake
Copyright Information: © Springer-Verlag GmbH Austria, part of Springer Nature 2020.
Funders: Brazilian Research Council (BRC), Research Foundation of the State of São Paulo (RFSSP), Australian Federal Government (AFG), Sugar Research and Development Cooperation
Projects and Grants: BRC Grant CNPq 301424/2015-2, BRC Grant 403946/2013-1, BRC Grant401662/2016-0, BRC Grant 425174/2018-2, BRC Grant 300916/2018-3, RFSSP Grant FAPESP 2011/18072-2, RFSSP Grant 2014/12406-4, RFSSP Grant 2014/05887-6, RFSSP Grant 2017/20925-0, RFSSP Grant 2017/20925-0, RFSSP Grant 2017/50445-0
Date Deposited: 20 May 2020 07:39
FoR Codes: 30 AGRICULTURAL, VETERINARY AND FOOD SCIENCES > 3004 Crop and pasture production > 300499 Crop and pasture production not elsewhere classified @ 100%
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