Liming surface application effects on plant chemical traits, under no-tillage systems, are not well defined yet. A field trial has been carried out on a dystrophic dark red latosol (Haplortox) at Ponta Grossa, State of Paraná, Brazil, aiming at evaluate liming surface application effects, under a no-tillage scheme, on soybean nutrient uptake and its reflexes on grain yielding performances. A randomized complete block design has been used, in which four dolomitic limestone rates have been studied (0, 2, 4 and 6 t.ha-1), with twelve replications. Those rates have been set up to increase soil base saturation, in the 0-20 cm soil layer, to 50%, 70% and 90%, respectively. Surface liming application has increased P and Mg plant levels and decreased Zn and Mn ones, as expected by the presence of higher soil pH’s in surface layers, with no significant effects on grain yields. So, high soybean grain yields, reported in highly acidic soils under no-tillage systems, might be related to proper water and nutrient uptakes due to higher soil moisture avaiability.
Glycine max (L.) Merrill; soil acidity; mineral nutrition
