Alvaro Pires da Silva

• Abstract

  Soil water availability to plants is defined as the amount of water ranging from field capacity and wilting point. Moreover, plant growth may also be modified directly by strength and aeration. So far the Least Limiting Water Range (LLWR) is the only soil physical parameter that integrates the complex interactions between water content and soil structure, which determine the potential of …

  A field methodology for measuring the least limiting water range of soils, AP.R

• Abstract

  Eventual soil subsoiling is one of the frequently indications to alleviate soil compaction under no-tillage system worldwide. However there is a lack of scientific information on this subject in the pioneer area for no-tillage system in Brazil (Ponta Grossa, Paraná). Therefore the objective of this research is to evaluate, in a clay Oxisol, the impact of mechanical and biological subsoili…

  Mechanical and biological soil decompaction under no-tillage: impact on soil physical attributes and grain yield, AP.R

• Abstract

  Sustainable food production, clean development mechanisms, and the rational and environmentally responsible use of natural resources are increasingly important themes in discussions of Brazilian agriculture and livestock production. In this context, land uses involving extreme landscape modification, monocultures, and pasture degradation remain the primary threats to sustainability. Pastu…

  The soil physical quality in different systems of integration crop-livestock and crop-livestock-forest, BP.PD

• Abstract

  The Amazonian Dark Earths (ADE)came from different activities of precolonial man on the original soil, resulting in the formation of a anthropic horizon. Several studies have been developed in anthropic soils, but with a focus on chemical and biological properties of these soils. Researches on the physical behavior of the soil in these environments are still incipient. Our objectives are …

  PHYSICAL-HYDRIC AND STRUCTURAL CHARACTERIZATION OF SOILS WITH ANTHROPIC HORIZONS IN CAXIUANÃ/PA, BP.DR

• Abstract

  Modern agriculture has suffered a large impact of mechanization of major crops. The sugar cane (Saccharum officinarum L.) is a highly mechanized culture, and because of its remain in the field to be durable, is very susceptible to compaction. The compaction is a process dependent on several intrinsic and extrinsic factors of soil and can be reversed by some techniques such as deep plowing…

  Application of penetrometer on quantification of soil compaction, BP.MS

(Only some records are available in English at this moment)

• Abstract

  Soil organic matter of Amazonian Dark Earths (ADEs) is largely comprised of carbon of pyrogenic origin (PyC). Although it is well known that PyC represents a key constituent of these soils, exerting many important functions that enhance nutrient availability and organic matter stability, it is still unclear how PyC influence soil physical properties. Moreover, both a generally accepted de…

  Determining chemical composition of pyrogenic carbon in soil aggregates of Amazonian dark Earths, BE.EP.DR