Applying lime on the soil surface in soils managed under no-tillage has caused an excess of basic cations in the most superficial layers of the soil profile. On the other hand, subsoil acidity is considered a constraint to the development of deep plant roots. The objective of this study was to evaluate Ca2+, Mg2+, NO3– and SO42- leaching in the soil profile as affected by liming and top dressing nitrogen fertilization in cotton, grown with straw cover on the soil […]

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 […]

Lime application on the soil surface in no-tillage systems, without incorporation, has not been effective in certain edaphic and climatic conditions for the correction of acidity or for calcium and magnesium supply to plants. Searching alternatives for limestone application without the conventional tilling and harrowing operations, this study tried to evaluate the efficiency of different lime application forms for the chemical soil attributes, nutritional state, and agronomic characteristics of corn crop. A randomized block design with split-plots and three replications […]

The effects of superficial lime application on chemical soil characteristics in no-tillage systems and its influence on root growth and mineral nutrition in maize crops has not been thoroughly investigated yet. To evaluate these effects on maize (hybrid AG 9090) and its reflexes on the grain yield performance under no-tillage, a field trial was carried out on a dystrophic Red Latosol (Hapludox) in Ponta Grossa, State of Paraná, Brazil. A completely randomized block design with three replications was used in […]

A field experiment was conducted in the state of Paraná, Brazil, to evaluate the effect of liming on soil acidity, soil nutrient availability and yields of maize and soybeans on a Red Latosol (Oxysol), which had been cultivated for three, six and nine years under no-tillage (NT). Lime was broadcasted to the soil surface in four rates- 0, 33.3, 66.7 and 100% of the amount calculated to increase the soil base saturation (V%) to 70%; an additional treatment consisted of […]

The no-tillage system with grain crops occupies today 2.5 millions hectares in the state of Paraná. Besides the traditional rotation system with wheat and soybean, in many areas green manure cover crops are also sown in the Winter and corn in the Summer. The objective of this study was to evaluate changes in some of the soil chemical properties after eight years under the crop rotation systems: wheat-soybean-black oat-soybean (WOS), wheat-soybean-lupine-corn-black oat-soybean (LCO), lupine-corn-wheat-soybean (LC) and compare them with the […]

Vegetative soil cover between citrus tree rows in sand soils originated from Caiuá sandstone geological formation in the northwest of the state of Parana, Brazil is a management practice required to protect soil from erosion. A field experiment was set up in 1993 in a citrus orchard with pear orange on rangpur lime rootstock located at Alto Paraná. Six types of soil management were evaluated in the 1995/1996 season and the following was determined: fruit yields (total weight and number), […]