Fluxos de transpiração de tres variedades de cana-de-açucar sob altas condições de demanda hidrica




The quantification of vegetal transpiration is basic for the determination of the water flow of an area and/or watershed. The inquiry concerning transpiration points the stoma as the main point of control of the water flow, thus the efficiency of the use of the water for the varieties can be considered as a species of relation cost/benefit to increase the sugarcane production, with the minimum impact in the hydro reserve of the ecosystem. Brazil is an important producer of sugarcane and alcohol and in states as São Paulo, a great percentage of its area is busy for watershed with predominant covering of sugarcane. Intent to this fact a study that measured vegetable transpiration for three common varieties to the region of the watershed of the river Piracicaba, with the measures was elaborated if concentrating of September the November of 2002. An experimental device in a pertaining area to the College of Agricultural Engineering of the State University of Campinas (UNICAMP), city of Campinas was implanted. One worked with varieties SP 832842, SP 801842 and SP 791011, carrying through measured of leaf transpiration, stomatal conductance, active radiation photosynthetic and deficit of vapor pressure saturated. In the period of analysis of this study it was verified that the average greater of transpiration was of 4.38 mmolm-2s-1 for SP 791011. The biggest transpiration tax in variety SP 801842 was of 4.19 mmolm-2s-1 and in SP 832847 was of 4.16 mmolm-2s-1. Variety SP 791011 registered a transpiration in average 4,5% superior to the found one for 5,3% variety SP 801842 and superior to the verified one in variety SP 832847, while SP 801842 registered an average transpiration 0,7% greater when compared variety SP 832847


fisiologia vegetal radiação solar cana-de-açucar evapotranspiração

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