Surface lime application to an acid soil under no-till system and normal rainfall conditions increases yield and crop root growth near the soil surface, but the effects of lime sources like flue dust, sewage sludge and aqueous lime have not been fully investigated . The experiment aimed to evaluate the effects of surface application of different lime sources on soil chemical attributes of a clayey, dystrophic Oxisol and black oat root growth and yield under a no-till system. Evaluations were conducted two years after the lime materials were surface-applied. The treatments consisted of surface applications of centrifuged sewage sludge, flue dust, aqueous lime, dolomitic lime and an unlimed control arranged in a randomized complete block design with four replications. Surface application of lime, flue dust, aqueous lime and sewage sludge increased soil pH, exchangeable Ca, resin P and reduced the exchangeable Al in soil. Black oat root growth, above-ground dry matter and grain yield increased with surface applications of the different lime sources in no-till system.
No-till; soil acidity; liming; Oxisol
