Temperaturas maximas prejudiciais ao feijoeiro no Estado do Rio Grande do Sul, BrasilMaximum temperature harmful to bean crop in the state Rio Grande do Sul, Brazil

摘要

The objective of this study was to verify temporal and spatial variability of the probable occurrence of decendial mean maximum temperature harmful (>= 28 degrees C) to bean crop, in 23 locations of the Rio Grande do Sul State. The maximum temperature data were collected at the Fundacao Estadual de Pesquisa Agropecuaria from 1954 to 2004. With the data, it was calculated the probability of harmful decendial mean maximum temperature equal to greater than 28 degrees C for each decendial and locations, from October to March. The correlation. analyses were performed between geographic coordinates and probabilities in each decendial for the October-March period. Location were clustered by the complete linkage method. There are variabilities in the occurrence of the harmful decendial mean maximum temperature for bean crop in the Rio Grande do Sul State both on a temporal and spatial scale. Highest climatic risk of decendial maximum temperature harmful bean crop in Rio Grande do Sul State occur in January the third decendial, with gradative decrease up to October the first decendial and to March the third decendial. There is association between the probability of occurrence of the harmful decendial mean maximum temperature for bean crop in the Rio Grande do Sul State and geographic coordinates, with higher climatic risk in regions with low attitude and low longitude.