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Crop Coefficient for Coffee as a Function of Leaf Area Index


Affiliations
1 Federal Institute of Mato Grosso, IFMT, Avenue Vilmar Fernandes, 300, Confresa-MT, Brazil
2 Agricultural Engineering Department/Federal University of Lavras, UFLA, University Campus, 37200-000, Lavras-MG, Brazil
3 University of Brasília, UNB, Darcy Ribeiro University Campus, Asa Norte, 70910-900, Brasilia-DF, Brazil
4 Agricultural Engineering Department/Federal University of Lavras, UFLA, University Campus, 37200-000, Lavras-MG, Brazil, Brazil
 

This study was conducted in an experimental site at the Federal University of Lavras, Brazil, to estimate the single crop coefficient (Kc) for drip-irrigated coffee (Coffea arabica) and provide a mathematical description based on leaf area index (LAI). The cultivar used was Catiguá MG-3 planted in May 2007 with a spacing of 2.5 ± 0.6 m. The LAI were obtained from the average of plant height and canopy diameter with data derived from bimonthly measurements between 2007 and 2013. Kc values were determined from crop evapotranspiration (ETc) and reference evapotranspiration (ETo). ETc was estimated from the water balance between the periods of successive irrigations in which there was no precipitation, while ETo was obtained using the Penman–Monteith equation parameterized by FAO. To describe the relationship between Kc and LAI, linear and nonlinear models were used. The logistic model was best for describing the Kc values as a function of LAI. The determined minimum, mean and maximum Kc values were 0.21, 0.57 and 0.80 respectively.

Keywords

Crop Height, Coffee, Drip Irrigation, Evapotranspiration, Leaf Area Index.
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  • Crop Coefficient for Coffee as a Function of Leaf Area Index

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Authors

J. A. do Vale Sant’Ana
Federal Institute of Mato Grosso, IFMT, Avenue Vilmar Fernandes, 300, Confresa-MT, Brazil
A. Colombo
Agricultural Engineering Department/Federal University of Lavras, UFLA, University Campus, 37200-000, Lavras-MG, Brazil
J. J. da Silva Junior
University of Brasília, UNB, Darcy Ribeiro University Campus, Asa Norte, 70910-900, Brasilia-DF, Brazil
M. S. Scalco
Agricultural Engineering Department/Federal University of Lavras, UFLA, University Campus, 37200-000, Lavras-MG, Brazil
R. A. da Silva
Agricultural Engineering Department/Federal University of Lavras, UFLA, University Campus, 37200-000, Lavras-MG, Brazil, Brazil

Abstract


This study was conducted in an experimental site at the Federal University of Lavras, Brazil, to estimate the single crop coefficient (Kc) for drip-irrigated coffee (Coffea arabica) and provide a mathematical description based on leaf area index (LAI). The cultivar used was Catiguá MG-3 planted in May 2007 with a spacing of 2.5 ± 0.6 m. The LAI were obtained from the average of plant height and canopy diameter with data derived from bimonthly measurements between 2007 and 2013. Kc values were determined from crop evapotranspiration (ETc) and reference evapotranspiration (ETo). ETc was estimated from the water balance between the periods of successive irrigations in which there was no precipitation, while ETo was obtained using the Penman–Monteith equation parameterized by FAO. To describe the relationship between Kc and LAI, linear and nonlinear models were used. The logistic model was best for describing the Kc values as a function of LAI. The determined minimum, mean and maximum Kc values were 0.21, 0.57 and 0.80 respectively.

Keywords


Crop Height, Coffee, Drip Irrigation, Evapotranspiration, Leaf Area Index.

References





DOI: https://doi.org/10.18520/cs%2Fv122%2Fi1%2F70-76