ABSTRACT Improvement of soil chemical properties in dystrophic Oxisols managed under long-term no-tillage system (NTS) with surface broadcast lime has been, frequently, restricted to a shallow topsoil layer. As a consequence, a sharply-defined chemical quality gradient is created, with deterioration from the surface towards deeper layers in Oxisols in southern Brazil. The aim of this study was to assess the temporal effects of gypsum, applied alone or in combination with lime, on Ca2+ content and Al3+ saturation in the rooting […]

Cover crop residues mobilize cations and benefit the action of lime applied on the soil surface owing to the release of low molecular weight organic acids from the soluble fraction of residues. However, these effects in no-till system are yet to be confirmed in field studies. A five-year trial was carried out on a no-till dystrophic Rhodic Hapludox in Ponta Grossa, State of Paraná, Brazil, with the aim of evaluating changes in chemical soil attributes, as well as the corn […]

Alterations in soil chemical properties after liming depend on the frequency of soil sampling and rainfall. This study evaluated such alterations in a Typic Haplorthox (Rhodic Ferralsol) with a sandy-loam superficial layer. The experiment had a completely randomized block design, with four dolomitic lime rates (0, 2.4, 4.8, and 7.2 t ha-1) and three replicates. The experiment was carried out in Alto Parana in northwestern Parana state (southern Brazil). Lime was broadcast on the soil surface over Brachiaria decumbens grass residues in-between […]

Root growth and crop yield can be affected by chemical modifications of the soil profile owing to lime and gypsum applications. A field trial was carried out on a dystrophic Clay Rhodic Hapludox in Ponta Grossa, Paraná State, Brazil, aiming to evaluate the changes in the chemical soil properties and corn response to lime and gypsum applications at the installation of a no-tillage system. A randomized complete block design was used, with three replications, in a split-plot experiment. The main […]

There has been an increasing interest to search alternatives for the establishment of crops under no-tillage systems in the southern region of Brazil, opening up new areas without soil disturbance. A field trial was carried out on a dystrophic Clay Rhodic Hapludox in Ponta Grossa, Paraná State, Brazil, from 1998 to 2001, with the aim to evaluate changes in chemical soil characteristics, as well as the soybean response to lime and gypsum applications in a no-tillage system. A completely randomized […]

Calcium deficiency and aluminum toxicity are considered to be the most important acidity factors limiting root growth. A field experiment was carried out on a dystrophic Red Latosol (Haplortox) in Ponta Grossa, Paraná, Brazil, to study the effects of surface application of lime and gypsum on root growth and nutrient uptake by soybean, cv. EMBRAPA 58, under no-tillage system. A randomized complete block design was used, with three replications, in a split-plot experiment. Dolomitic limestone was applied at rates of […]

This experiment was carried out on a dystrophic Dark-Red Latosol from Ponta Grossa, Paraná, Brazil, to evaluate the yield of corn, wheat and soybean as a function of the changes in the chemical characteristics of soil due to surface application of lime and gypsum under a no-tillage system. A completely randomized block design was used, with three replications, in a split-plot experiment. Dolomitic limestone was applied at rates of 0, 2, 4 and 6 t ha-1 (main plots) in July […]

The experiment was carried out on a dystrophic Dark Red Latosol from Ponta Grossa, Paraná State, Brazil, to evaluate the effects of the surface application of lime and gypsum on soil chemical characteristics and soybean response in no-tillage. A randomized complete block design was used, with three replications, in a split-plot experiment. Dolomitic limestone was applied at rates of 0, 2, 4 and 6 t ha-1 (main plots) in July of 1993; gypsum was applied at rates of 0, 4, […]