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SIMULACAO PARA DETERMINACAO DAS EPOCAS DE SEMEADURA COM MENOR RISCO DE ESTRESSE HIDRICO PARA O FEIJAO NA REGIAO CENTRAL DO RIO GRANDE DO SUL  Joel Cordeiro da Silva, Arno Bernardo Heldwein, Fabrina Bolzan Martins, Guilherme Fabiano MaassDepartamento de Fitotecnia, Universidade Federal de Santa Maria, Centro de Ciencias Rurais, Santa Maria, RS, joelcordeiro@mail.ufsm.br  1 RESUMO O objetivo deste trabalho foi determinar as epocas de semeadura com menor risco de ocorrencia de estresse hidrico para a producao de feijao na regiao Central do Rio Grande do Sul. As deficiencias e os excessos de agua no solo foram determinados pelo calculo do balanco hidrico diario do solo, simulando-se o desenvolvimento do feijoeiro em 29 epocas de semeadura, para cada ano dos dados coletados na Estacao Climatologica principal de Santa Maria (lat: 29°43’23’’S, long: 53°43’15’’W e alt: 95m), desde agosto de 1968 ate julho de 2004. Considerando-se que ha maior risco de reducao de rendimento, quando ocorre deficiencia hidrica nos primeiros 20 dias da floracao e quando ocorre excesso hidrico entre a semeadura e a emergencia e entre 20 dias apos o inicio da floracao e a maturacao fisiologica, constatou-se que as melhores epocas para a semeadura do feijoeiro na regiao central do Rio Grande do Sul sao os periodos de 20/set e 01/out e entre 05 e 15 de fevereiro. UNITERMOS: balanco hidrico, Phaseolus vulgaris, funcao de distribuicao de probabilidade, risco climatico.  SILVA , J. C. da; HELDWEIN, A. B.; MARTINS, F. B.; MAASS, G. F.SIMULATION TO DETERMINE SOWING SEASONS WITH SMALLEST RISK OF WATER STRESS FOR BEAN CROP IN THE CENTRAL REGION OFRIO GRANDEDOSUL STATE,BRAZIL  2 ABSTRACT The objective of this study was determine the sowing seasons with smallest risk of water stress for the bean production in the Central area of Rio Grande do Sul (RS) state, Brazil. The water balance of the soil was calculated to determine the deficiencies and surpluses of soil water for 29 growing seasons. Data were collected in a climatological station inSanta Maria, RS (lat: 29°43’23’’S, long: 53°43’15’’W and alt: 95m) from August of 1968 to July of 2004. Considering that the greatest risk of damage is when water deficiency takes place during the periods from sowing to germination and from the beginning of flowering to 20 days after and when water surplus takes place during the first 20 days of flowering, the results allowed to conclude that the recommended growing seasons are 20/Set to 01/Out and 05/Fev to 15/Fev. KEYWORDS: water balance, Phaseolus vulgaris, probability distribution function, climatic risk.

SIMULAÇÃO PARA DETERMINAÇÃO DAS ÉPOCAS DE SEMEADURA COM MENOR RISCO DE ESTRESSE HÍDRICO PARA O FEIJÃO NA REGIÃO CENTRAL DO RIO GRANDE DO SUL