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Determinou-se a resistência mecânica à penetração (RP) de um Argissolo Amarelo Distrófico típico em 1997, em Pelotas (RS), Brasil (31º49'S e 52º30'W). O experimento consistiu de oito tratamentos envolvendo diferentes culturas de cobertura, em rotação e sucessão no sistema plantio direto. As amostragens de RP foram realizadas até a profundidade de 0,60 m e a umidade gravimétrica nas camadas de 0,00-0,10; 0,10-0,20; 0,20-0,40 e 0,40-0,60m. Os sistemas de produção apresentaram valores de RP mais elevados até 0,20m; no tratamento azevém/feijão, aveia/soja, ervilhaca/milho o solo apresentou os maiores valores de RP. The determination of the penetration resistance (RP) of a typical Hapludalf was accomplished in 1997, in Pelotas (RS), Brazil (31º49'S and 52º30'W). The study consisted of eight treatments with different cover crops, under rotation and succession under no-tillage. The samplings were accomplished up to the depth of 0.60 m and soil water content were accomplished in the layers of 0.00-0.10; 0.10-0.20; 0.20-0.40 and 0.40-0.60m. Starting from the obtained results it was concluded that the production systems presented values of RP more elevated until to 0.20m; the treatment rye-grass/common bean, oat/soybean, vetch/corn presented the largest values of RP along the soil profile

Resistência mecânica à penetração de um argissolo amarelo distrófico típico sob diferentes sistemas de produção em plantio direto