Amounts of lime recommended for carrots and lettuce have little experimental support for the amounts indicated. This research was developed to determine the adequate value of soil bases saturation (V) and pH (CaCl2) to obtain the best yield and commercial quality of carrot (winter) and lettuce (summer) cultivated on crop rotation system during three years. The experiment was carried out in Monte Alegre do Sul, São Paulo State, Brazil, on a Typic Kandaudult soil. The residual effect of liming, at the second and third years, was also evaluated. The treatments were: 0; 2; 4; 6 and 8 t ha-1 of lime on the first year; 4 and 8 t ha-1 of lime on the second and third years successively. As a result, the positive effects of liming on yield and commercial quality of carrot and lettuce were evident during the three years, and residual effect of liming in the second and third years was evident, too. In the first year, carrot yields were 24% to 39% higher than treatment without lime, while lettuce head average weight increased from 79% to 199%. The highest carrot yields were 46 t ha-1 obtained at V=73% and pH (CaCl2) = 5,7. The best commercial results for lettuce were reached with V between 72% and 80% and pH (CaCl2) between 5,5 and 5,6. The treatment with liming and without B, Cu, Mn and Zn presented lower carrot yield and commercial quality during three years.
Daucus carota L.; Lactuca sativa L.; lime; crop rotation; pH; bases saturation
