PROBABILITY TO OCCUR EQUAL OR SUPERIOR PLUVIAL PRECIPITATION TO THE MAXIMUM EVAPOTRANSPIRATION FOR COMMON BEAN IN PLANALTO MEDIO OF RIO GRANDE DO SUL STATE, BRAZIL

Abstract

It was determined probability to occur equal or superior pluvial precipitation 100% and 60% of the
maximum evapotranspiration (ETm) of the common bean, in different sub period and sowing dates, for three
localities in Rio Grande do Sul State, Brazil. With the daily pluvial precipitation data, determined the accumulation
of pluvial precipitation (TPP) in each sub period, sowing date and locality. The adjustment of the data of TPP was
evaluated in each sub period, sowing date and locality, to the distributions normal and gama, using Lilliefors test
for first and Kolmogorov-Smirnovs test for second. It was verified that the probability the pluvial precipitation be
equal or superior of the ETm for common bean in complete cycle were minor in Julio de Castilhos, intermediary in
Cruz Alta and superior in Passo Fundo. However, between studies localities, Passo Fundo is the local of minor
production risk. The lesser probabilities had occurred during the sub periods most critical of the culture, understood
between the beginning of the flowering and the physiological maturation, when the probabilities are lesser than
50%, considering the total ETm. The three sowing dates considered, the lesser probabilities during the complete
cycle of the culture occurred in October and November, being that in the critical period, the sowing of September
presented the higher probability