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O estudo foi desenvolvido na Universidade Federal de Santa Maria, em Santa Maria, RS, no ano agrícola 1997/98, com a cultivar BR 16, sob o delineamento experimental blocos ao acaso com parcela subdividida e quatro repetições. O objetivo deste trabalho foi avaliar a capacidade de produção da cultura da soja, submetida a desfolhamento em diferentes níveis (0, 17, 33, 50, 67 e 100%) e fases de seu desenvolvimento (V9, R3, R5 e R6) de acordo com a escala de FEHR & CAVINESS (1977). Os níveis de 17, 33 e 50% reduziram o rendimento final da soja em torno de 6%, e os dois últimos 67 e 100%, redução de 8 e 37% em relação a 0% de desfolhamento. Níveis de desfolhamento superiores a 50% diminuem substancialmente o número de legumes e de grãos por planta de soja quando efetuados nos estádios de início de formação dos legumes (R3) e início do enchimento de grãos (R5). O peso de grão é reduzido mais drasticamente por desfolhas iguais ou superiores a 67% nos estádios R3 e R6. The work was carried out at the Federal University of Santa Maria, State of Rio Grande do Sul, in 1997/1998 using the cultivar BR 16. Statistical setup was a block design with sub-divided plots, with 4 replications. The objective of this research was to evaluate the yield of the soybean variety BR16 when submitted to different defoliation levels (0, 17, 33, 50, 67 and 100%) and at different phases of development (V9, R3, R5 and R6) in agreement with the scale of FEHR & CAVINESS (1977). The defoliation levels of 17, 33 and 50% decreased seed yield by approximately 6% and the last two levels 67 and 100%, by about 8 and 37% in relation to 0% of defoliation. Levels of defoliation above 50% decrease the number of normal pods substantially and grains for plant when made at the beginning in the stadiums of formation of the pods (R3) and beginning of the formation of grains (R5). The reduction of grain yield was effected by the number of normal pods number of normal grains and weight of 100 seeds, which were the components most effected by the treatments

Desfolhamento em estádios de desenvolvimento da soja, cultivar BR 16, no rendimento de grãos