Soil fertility parameters were evaluated after ten years (1984 to 1994) of no-tiliage cropping in a latossolo bruno álico, in Guarapuava, state of Paraná, Brazil, under four barley crop rotation systems as follows: system I (barley/soybean); system II (barley/soybean and common vetch/corn, from 1984 to 1989, and barley/soybean and white oats/soybean, from 1990 to 1993); system III (barley/soybean, flax/soybean, and common vetch/corn, from 1984 to 1989, and barley/soybean, common vetch/corn, and white oats/soybean, from 1990 to 1993); and system IV (barley/soybean, flax/soybean, white oats/ soybean and common vetch/corn). Crop systems and soil samples at dijferent depths were compared using the contrast procedure. Barley crop rotation systems, under no-till, raised organic matter. P, and K contents, chiefly in the 0 to 5cm layer. Higher pH and Ca+Mg values were observed in the soil layer 0 to 5cm, as compared to the 15 to 20cm layer. The opposite was observed for exchangeable Al contents.
crop succession; soil fertility; liming; no-tiliage
