PROBABILITY OF OCCURRENCE OF SOLAR RADIATION VALUES HARIVIFEUL TO CUCUMBER IN THE BAIXO VALE DO TAQUARI REGION, RS
Abstract
The probability of occurrence of low values of solar radiation, which are harmful to cucumber, was calculated in thel3aixo Vale do Taquari Region, Rio Grande do Sul State, Brazil. Daily data of solar radiation from 1963 to 1999 obtained in the meteorological station of Taquari (Latitude: 29° 48' S, Longitude: 51° 41W, Altitude: 75 m) were used. The following threshold values were used in this study: 8.4, 7.5 and 6.3 MJ/m 2.day. The first value was the threshold levei for growth and development of cucumber, and the other two leveis were the cause of serious yield tosses. The results showed that during the second and third decades of July the probability of occurring these threshold values of solar radiation is high: up to 9 days in each decade can be expected to have solar radiation lower than 8.4 and 7.5 MJ/m2.day.
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