A field experiment was conducted throughout 2009/2010 in a sugarcane field of a commercial distillery located on the coastal area of Paraiba state, Brazil. The objectives were to determine sugarcane water requirements and to test the single and dual crop coefficients by comparing the calculated values of ET with measured ones. Crop evapotranspiration was determined by field water balance, reference evapotranspiration ( ET o ) by the Penman-Monteith approach, while single and dual crop coefficients were computed through the standard FAO-56 methodology. The experimental area was cultivated with irrigation applied weekly by a centre pivot system in addition to rainfall and the irrigation scheduling was based on 100% ET o . Three statistical tests, mean bias difference ( MBD ), normalized root mean square difference ( NRMSD ) and regression analysis, were used to evaluate the performance of single and dual crop coefficients. Results showed that there was a notable symmetry between ET measured and ET calculated by K c dual. The ET values, calculated from K c single, underestimated those obtained from soil water balance measurements by 36%.
Menossi, M., Siva-Filho. M.C., Vincentz. M.C., Van-Sluys. M.A. and Souza. G.M. (2008) Sugarcane functional genomics: Gene discovery for agronomic trait development. International Journal of Plant Genomics, 1, 1-11. doi:10.1155/2008/458732
Pinto, L.F.G., Bernardes, M.S., Stape. J.L. and Pereira, A.R. (2005) Growth yield and system performance simulation of a sugarcane—Eucalyptus interface in a subtropical region of Brazil. Agriculture, Ecosystems & Environment, 105, 77-86. doi:10.1016/j.agee.2004.05.003
Silva, V.P.R., Sousa, F.S.S., Cavalcanti, E.P., Souza and E.P., Silva, B. B. (2006) Teleconnections between sea-surface temperature anomalies and air temperature in northeast Brazil. Journal of Atmospheric and Terrestrial Physics, 68, 781-792. doi:10.1016/j.jastp.2005.12.002
Lebourgeois, V., Chopart, J. L., Bégué, A. and Mézo, L. L. (2010) Towards using a thermal infrared index combined with water balance modeling to monitor sugarcane irrigation in a tropical environment. Agricultural Water Management, 97, 75-82. doi:10.1016/j.agwat.2009.08.013
Wiedenfeld, N. (2008) Effects of irrigation water salinity and electrostatic water treatment for sugarcane production. Agricultural Water Management, 95, 86-88. doi:10.1016/j.agwat.2007.10.004
Watanabe, K., Yamamoto, T., Yamada, T., Sakuratani, T., Nawata, E., Noichana, C., Sributta, A. and Higuchi, H. (2004) Changes in seasonal evapotranspiration. soil water content and crop coefficients in sugarcane, cassava and maize fields in Northeast Thailand. Agricultural Water Management, 67, 133-143. doi:10.1016/j.agwat.2004.02.004
Chabot, R., Bouarf, S., Zimmer, D., Chaumont, C. and Duprez, C. (2002) Sugarcane transpiration with shallow water-table: Sap flow measurements and modeling. Agricultural Water Management, 54, 17-36. doi:10.1016/S0378-3774(01)00139-1
Inman-Bamber, N.G. and Smith. D.M. (2005) Water relations in sugarcane and response to water deficits, Field Crops Research, 92, 185-202. doi:10.1016/j.fcr.2005.01.023
Choudhary, O.P., Josan, A.S., Bajwa, M.S. and Kapur, M.L. (2004) Effect of sustained sodic and saline-sodic irrigation and application of gypsum and farmyard manure on yield and quality of sugarcane under semi-arid conditions. Field Crops Research, 87, 103-116. doi:10.1016/j.fcr.2003.10.001
Inman-Bamber, N.G. and McGlinchey, M.G. (2003) Field Crop coefficients and water-use estimates for sugarcane based on long-term Bowen ratio energy balance measurements. Crop Research, 83, 125-138. doi:10.1016/S0378-4290(03)00069-8
Omary, M. and Izuno, F.T. (1995) Evaluation of sugarcane evapotranspiration from water table data in the everglades agricultural area. Agricultural Water Management, 27, 309-319. doi:10.1016/0378-3774(95)01149-D
Van den Berg, M., Burrough, P.A. and Driessen, P.M. (2000) Uncertainties in the appraisal of water availability and consequences for simulated sugarcane yield potentials in S?o Paulo State. Brazil. Agriculture, Ecosystems & Environment, 81, 43-55. doi:10.1016/S0167-8809(00)00167-5
Rodrigues, F.A., Laia, M.L. and Zingaretti, S.M. (2009) Analysis of gene expression profiles under water stress in tolerant and sensitive sugarcane plants. Plant Science, 176, 286-302. doi:10.1016/j.plantsci.2008.11.007
Pereira, L.S., Perrier, A., Allen, F.G. and Alves, I. (1999) Evapotranspiration: concepts and future trends. Journal of Irrigation and Drainage Engineering, 125, 45-51. doi:10.1061/(ASCE)0733-9437(1999)125:2(45)
Doorenbos, J. and Pruitt, W.O. (1977) Crop water re-quirements. FAO Irrigation Drainage Paper No. 24, FAO, Rome.
Allen, R.G., Pereira, L.S., Raes, D. and Smith, M. (1998) Crop evapotranspiration. Guidelines for Computing Crop Water Requirements. FAO Irrigation Drainage Paper No. 56, FAO, Rome.
Kashyap, P.S. and Panda, R.K. (2001) Evaluation of evapotranspiration estimation methods and development of crop-coefficients for potato crop in a sub-humid region. Agricultural Water Management, 50, 9-25. doi:10.1016/S0378-3774(01)00102-0
Qiu, G.Y., Momii, K., Yano, T. and Lascano, R.J. (1999) Experimental verification of a mechanistic model to partition evapotranspiration into soil water and plant evaporation. Agricultural and Forest Meteorology, 93, 79-93. doi:10.1016/S0168-1923(98)00115-4
Allen, R.G. (2000) Using the FAO-56 dual crop coefficient method over an irrigated region as part of an evapotranspiration intercomparison study. Journal of Hydrology, 229, 27-41.
López-Urrea, R., Olalla, F.M.S. and López-Fuster, A.M. (2009) Single and dual crop coefficients and water requirements for onion (Allium cepa L.) under semiarid conditions. Agricultural Water Management, 96, 1031-1036. doi:10.1016/j.agwat.2009.02.004
Liu, Y. and Luo, Y. (2010) A consolidated evaluation of the FAO-56 dual crop coefficient approach using the lysimeter data in the North China Plain. Agricultural Water Management, 97, 31-40. doi:10.1016/j.agwat.2009.07.003
Flumignan, D.L., Faria, R.T. and Prete, C.E.C. (2011) Evapotranspiration components and dual crop coefficients of coffee trees during crop production. Agricultural Water Management, 98, 791-800. doi:10.1016/j.agwat.2010.12.002
Silva, V.P.R. (2004) On climate variability in Northeast of Brazil. Journal of Arid Environments, 58, 575-596. doi:10.1016/j.jaridenv.2003.12.002
Qi, Z. and Helmers, M.J. (2010) The conversion of permittivity as measured by a PR2 capacitance probe into soil moisture values for Des Moines lobe soils in Iowa. Soil Use and Management, 26, 82-92. doi:10.1111/j.1475-2743.2009.00256.x
Jonckheere, I., Fleck, S., Nackaerts, K., Muys, B., Coppin, P., Weiss, M. and Baret, F. (2004) Review of methods for in situ leaf area index determination Part I. Theories, sensors and hemispherical photography. Agricultural and Forest Meteorology, 121, 19-35. doi:10.1016/j.agrformet.2003.08.027
Bodner, G., Loiskandl, W. and Kaul, H.P. (2007) Cover crop evapotranspiration under semi-arid conditions using FAO dual crop coefficient method with water stress compensation. Agricultural Water Management, 93, 85-98. doi:10.1016/j.agwat.2007.06.010
Silva, V.P.R., Silva, R.A., Cavalcanti, E.P., Braga, C.C., Azevedo, P.V., Singh, V.P. and Pereira, E.R.R. (2010) Trends in solar radiation in NCEP/NCAR database and measurements in northeastern Brazil. Solar Energy, 84, 1852-1862. doi:10.1016/j.solener.2010.07.011
Medeiros, G.A., Arruda, F.B., Sakai, E. and Fujiwars, M. (2001) The influence of crop canopy on evapotranspiration and crop coefficient of beans (Phaseolus vulgaris L.) Agricultural Water Management, 49, 211-224. doi:10.1016/S0378-3774(00)00150-5
Williams, L.E. and Ayars, J.E. (2005) Grapevine water use and the crop coefficient are linear functions of the shaded area measured beneath the canopy. Agricultural and Forest Meteorology, 132, 201-211. doi:10.1016/j.agrformet.2005.07.010
Trambouze, W., Bertuzzi, P. and Voltz, M. (1998) Comparison of methods for estimating actual evapotranspiration in a row-cropped vineyard. Agricultural and Forest Meteorology, 91, 193-208. doi:10.1016/S0168-1923(98)00072-0
Azevedo, P.V., Silva, B.B. and Silva, V.P.R. (2003) Water requirements of irrigated mango orchards in northeast Brazil. Agricultural Water Management, 58, 241-254. doi:10.1016/S0378-3774(02)00083-5
Moroizumi, T., Hamada, H., Sukchan, S. and Ikemoto, M. (2009) Soil water content and water balance in rainfed fields in Northeast Thailand. Agricultural Water Management, 96, 160-166. doi:10.1016/j.agwat.2008.07.007
Silva, V.P.R., Campos, J.H.B.C. and Azevedo, P.V. (2009) Water-use efficiency and evapotranspiration of mango orchard grown in northeastern region of Brazil. Scientia Horticuturae, 120, 467-472. doi:10.1016/j.scienta.2008.12.005