ABSTRACT Soils originating from the Caiuá sandstone formation have low soil organic matter (SOM), clay content, and cation exchange capacity (CEC). The predominance of one component over the other might decisively influence the CEC of these soils. Particle size distribution and selective dissolution procedures associated to a suit of methods to determine the exchangeable capacity properties might clarify the relative importance of each soil component. The objective of this work was to evaluate the contribution of the different components of […]

ABSTRACT Production of Conilon coffee under organic management systems has increased in the State of Espirito Santo, Brazil. However, information is lacking in regard to the impact of these management practices on soil carbon and nitrogen stocks. The aim of this study was to evaluate the effect of organic fertilization on C and N stocks and soil bulk density (Bd) in a Conilon coffee agrosystem. A field experiment was carried out in Linhares, ES, in a randomized block design in […]

The criteria currently used in Southern Brazil for the definition of the nitrogen (N) rate to be applied in maize are based on the soil organic matter content, the expected grain yield and the characteristics of the previous crop. Although the carbon:nitrogen (C/N) ratio is high, black oat is the most commonly used winter species antecedent to commercial summer crops. This characteristic can result in soil N immobilization, N plant deficiency and reduced grain yield in maize. Although the antecedent […]

The performance of no-tillage systems depends, among other factors, on the quantity and quality of residues added to the soil. In Southern Brazil, the main cover crop anteceding summer crops is black oat (Avena strigosa, Schieb). The growth of this grass is often limited by N deficiency. In this situation, nitrogen fertilization is a possible option to increase the efficiency of this cover crop in no-tillage systems. Main goal of this study was the evaluation of effects of N rates […]

Eucalyptus and acacia species are widely used in agrosilviculture and reforestry practices. In order to evaluate the reconstitution of organic soil layers – i.e. the humic horizons -and establish relationships to the soil properties, the holorganic and hemiorganic horizons were sampled under Acacia mangium and Eucalyptus grandis plantations. These plantations lie in the tertiary tableland region in the North of Espírito Santo State, Brazil, and are part of the Natural reservation Area of the Vale do Rio Doce Company. Samples […]