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Using thermal units for crop coefficient estimation and irrigation scheduling improves yield and water productivity of corn (Zea mays L.)

AuthorsBautista-Capetillo, Carlos F.; Zapata, Manuel CSIC; Martínez-Cob, Antonio CSIC
Keywordsdaily corn crop coefficients
water use productivity
grain yield
economic productivity
Issue Date2013
PublisherAmerican Society of Civil Engineers
CitationBautista Capetillo C, Zapata M, Martínez-Cob A. Using thermal units for crop coefficient estimation and irrigation scheduling improves yield and water productivity of corn (Zea mays L.). Journal of Irrigation and Drainage Engineering 139 (3): 214-220 (2013)
AbstractEstimates of daily crop coefficient (Kc) for corn and irrigation scheduling were performed during 2009 and 2010 by means of two approaches: treatment I, computation of Kc using the FAO method; treatment II, computation of Kc from relative fraction of thermal units. Corn crop water requirements and irrigation gross depth for treatment I were about 25 to 33 % lower than that for treatment II in 2009 and 2010 respectively. However, the performance of the treatment II was better in terms of grain yield which was 9.2 Mg ha-1 (in 2009) and 9.4 Mg ha-1 (in 2010), about 37 and 29 % higher than that for treatment I. Water productivity was about 10 % higher for treatment II during 2009 and practically the same than that of treatment I for 2010. Due to the year-to-year variability the water productivity was about 25 % (treatment II) and 11 % (treatment I) for 2010 than for 2009. Finally, economic productivity for treatment II was 2162 $ ha-1 for both seasons, much higher than that for treatment I, 1575 (in 2009) and 1679 (in 2010) $ ha-1. These results confirm that the use of fraction of thermal units to estimate corn crop coefficient has improved the yield, and the water management of this crop under the conditions of this study. Because of the limitations of the study (only two years and one experimental plot), further evaluations under other conditions (climatic, cultivar, etc.) should be performed.
Description31 Pags., 2 Tabls., 4 Figs. The definitive version is available at: http://cedb.asce.org/cgi/WWWdisplay.cgi?168575
Publisher version (URL)http://dx.doi.org/10.1061/(ASCE)IR.1943-4774.0000529
Appears in Collections:(EEAD) Artículos
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