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1 RESUMO O feijoeiro ( Phaseolus vulgaris L.) e uma cultura de grande expressao no cenario economico e social do Brasil. A hipotese do trabalho e de que a supressao do fornecimento de agua em alguma ou algumas fases do desenvolvimento do feijoeiro irrigado pode resultar em reducao de produtividade de, no maximo, 20%, permitindo economia de agua. O objetivo do presente trabalho foi avaliar a influencia da supressao de agua em uma das fases fenologicas (emergencia, vegetativa, floracao, enchimento de graos, maturacao), em comparacao com a irrigacao em nenhuma e em todas as fases, utilizando como indicadores os componentes da producao do feijao do grupo Carioca, cultivar IAC Alvorada. O trabalho foi conduzido na Faculdade de Ciencias Agronomicas/UNESP/Botucatu. O delineamento experimental utilizado foi o de blocos ao acaso, sendo sete tratamentos e quatro repeticoes. Os dados foram submetidos a analise de variância e teste t a 5% de probabilidade.  Uma chuva de 58 mm apos o plantio auxiliou na emergencia uniforme dos tratamentos. Os componentes de producao foram afetados nos tratamentos em que houve supressao da irrigacao na Fase Vegetativa e na Floracao. Os tratamentos onde a supressao da irrigacao ocorreu na Maturacao e na Emergencia sofreram reducao de produtividade de menos de 20%, corroborando a hipotese. Palavras-chave: ausencia de irrigacao, componentes de producao, fases fenologicas. WATER SUPRESSION IN DIFFERENT PHENOLOGICAL STAGES OF BEAN (Phaseolus vulgaris L.) 2 ABSTRACT Bean (Phaseolus vulgaris L.) is widespread in the Brazilian social and economic scene. The hypothesis is that if the water supply is suppressed in just one of the five development stages of irrigated beans, it can result in yield reduction lower than 20%, allowing water economy.   The objective of this study was to compare the performance of bean Carioca group IAC Alvorada yield components, with irrigation suppression in each of the five phenological phases (emergence, vegetative, flowering, grain filling and maturation) and no irrigation and irrigated in all stages. The study was conducted at Agronomical Sciences College, UNESP, Botucatu, SP, Brazil. The statistical design was the randomized block with seven treatments and four replications. Data were subjected to analysis of variance and “t” test at 5% probability. A rainfall event (58 mm) after planting allowed the successful emergence of seedling beans in plots where water would not be applied. The yield components were higher affect when there was irrigation’s suppression at Vegetative phase and at Flowering phase. The treatments where occurred irrigation suppression at Maturation and at Emergence showed yield reduction of less than 20%, proving the hypothesis. Keywords : yield components, irrigation deficit, phenological phases

SUPRESSÃO DE ÁGUA EM DIFERENTES FASES FENOLÓGICAS DO FEIJOEIRO (Phaseolus vulgaris L.)