01682nam a2200301 a 450000100080000000500110000800800410001910000170006024501170007726001550019430000140034950001040036352006330046765000120110065000230111265000180113565000220115365000100117565000240118565000120120965000210122165000250124265300190126765300200128665300310130665300220133770000210135911274432024-02-16       2000    bl uuuu     u00u1 u    #d1 aPORTO, E. R.  aIrregularidade pluviométrica e riscos de perdas para o feijãobdois estudos de caso no Semi-Árido brasileiro.  aIn: CONGRESSO BRASILEIRO DE METEOROLOGIA, 11., 2000, Rio de Janeiro. A meteorologia brasileira além do ano 2000: [anais]. Rio de Janeiro: SBMETc2000  c1 CD-ROM.  aTrabalho apresentado no 1º Simpósio Brasileiro do Trópico Sem-Árido, Olinda,PE, agosto de 1982.  aA major part of the Northeast of Brazil receives an average annual precipitation within the range of 500 through 700 mm, spread over a period of three to five months. In spite of such precipitation being apparently anough to supply the water requeriment for the beans crop, it is common to observe crop frustations due to occurence of water deficit. A mathematical model was developed, considering evapotranspiration, root system depth, soil water holding capacity and rainfall. The model output gives informations on the probability of the expected yield being good, regular, or poor, as a function of different planting times.  aClimate  aEvapotranspiration  aWater balance  aBalanço Hídrico  aClima  aEvapotranspiração  aFeijão  aRisco Climático  aZoneamento Agrícola  aIrregularidade  aModelo simulado  aPrecipitacao pluviometrica  aRecursos naturais1 aGARAGORRY, F. L.