Annual and seasonal regimen of chilling hours in Rio Grande do Sul State, Brazil
Abstract
It was determined annual and seasonal regimen of chilling hours below 7oC and 10oC in different climatic regions, in Rio Grande do Sul State, Brazil, between years of 1956 and 2003. The annual chilling hours varied from 121 hours in region of Baixo Vale do Uruguai, to 487 hours in Planalto Superior – Serra do Nordeste for temperature below 7°C. For temperature below 10°C, annual regimen of chilling hours varied from 387 hours to 1114 hours, respectively, in the same regions. In the winter, the chilling regimen varied from 100 to 337 hours for temperature below 7oC, and from 296 to 682 hours for temperature below 10oC, respectively in the regions of Baixo Vale do Uruguai anda Planalto Superior – Serra do Nordeste. The comparative results of autumn and spring, show similar regimen of chilling hours in different regions. In the summer, were verified low values of chilling hours, and only for temperature below 10°C.
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