This study aimed to evaluate the influence of fertilization doses of liquid dairy manure combined with mineral fertilizer on the chemical properties of a Brown Oxisol, in no-tillage system and winter and summer crop rotation (sorghum/black-oat/corn/ryegrass/corn/ryegrass), for silage production, in the layers 0-5, 5-10, 10-30, 30-50 and 50-80 cm. The treatments were distributed in three randomized blocks, divided in 12 plots per block, in a 3 x 4 factorial arrangement, with three mineral fertilizer levels (0, 50 and 100 % of the dose recommended for the crops) and four organic fertilizer levels (0, 30, 60 and 90 m³ ha-1 year-1). The liquid dairy manure increased the pH linearly in the 0-5 cm layer and quadratic in the 30-50 cm layer. The mineral fertilization reduced the pH values linearly in the 0-5 and 5-10 cm layers, with quadratic effect at 50-80 cm. The potential acidity decreased in 5-10 cm, with quadratic pattern at 10-30 cm. The exchangeable Ca2+ increased in the 0-5 cm layer with manure, but no effect of mineral fertilization on this attribute was verified. An increase in exchangeable Mg2+ levels was observed in the manure treatments to a depth of 30 cm; under mineral fertilizer, increases were observed from 30 cm downwards. There was a linear increase of base saturation through manure doses, down to a depth of 10 cm, and the mineral fertilization decreased base saturation at 5-10 cm, with a quadratic effect at 50-80 cm.
organic fertilization; crop rotation; soil fertility; no-tillage
